FEBRUARY p WIRELESS PART' »Lrx*. ***<r HOME TELEPHONE EXGHANGE^^^H RADIO CONTROL SERIES PART 2-TRANSMITTER.

Transcription

1 FEBRUARY 1975 WRELESS 25p PART'»Lrx*. ***<r HOME TELEPHONE EXGHANGE^^^H RADO CONTROL SERES PART 2-TRANSMTTER

2 :-':"'".' " ~ '.."~ ""~.?~ Total Building Costs A- O^.n? l* J rp«ira.jip fovcfkm (OYerseas 7 Ml fcll 23 F PP&ns.44p P J; P &: 1-85) C+ 8% VAT r,7p) <+ 8% YAT 57p) NEW ROAMER NNE WTH V.H.F. NCLUDNG ARCRAFT Nine Transistors. 9 Tuneable wa"ebaods as Roamer Ten. Built in ferrite rod aerial for MW/LW. Retractable chrome plated telescopic aerla! for VHF Rnd 8W. Push Pull output using 600 mw transilltors. 9 Tran!'listors 3 diodes. tun in( ' condenser with V.H.F. section. separate coil for aircraft, mo"ing coli loudspeaker,,'olurne O ~JOFF add "'avecbange cont.rols. Att.racth'e all white case with red grille anti carrying strap. Si1:e 9~" x i" )( 2f" approx. Parts Price List Plans.tOp (Free trith parts). Total Building Costs POCKET FVE 6-95 (+ 8% VAT 55p) r P &. ll". 44p (Oversea!- p " P 1'85) NOW WTH 5" LOUD- ff ".'i ' ". SPEAKER **... J NOW WTH 3" LOUD SPEAKER STiuiAbicwRvcbnnris, 3 Tunable wn, ebs. M. L,W. L.W. «n«j Trawler Jl. a.w. B, 7 stage" 5 transistors 2 slage«i»od«, 8 rftmlatorf diodes,»nper«naltlv«superllensit.h e Total BoMdlag BuihliDg Costs Cost. ferrlte terrjterodaerial ml aerial,. attractive attracti~eblack black. 2 A A ^ 50 rt P PP&. aojd Sire 51" x U~ x 2 nil,, «- P A 3i approx. J'lana Parts p (Oversea? P & P 1-23) anc! 'told ca~c. Size 5l" x l" x ns. Price 3~" approx. PJans Parts 2!ip LlstSOp LRt 20p (Free (!o'ree with 'With parts). <-r8% ( +8% VAT 20p) (O"erseu P & P 1-'15) TRANSONA C l/c r V C LOUDSPEAKER K0W WTH 3" Wavebajids, ransiatorv ape&ker as Pocket Five, Total Building Costs COlts M viai. nana anu rarta, 2"75 ATV^VS i V 3«p PPi ~.~&lns. ns. PficB parts). List 2Up (Free -rltb (+8% VAT '-'pj :!lp) (Orcrwaa P & P l-:!c) " 'a"eballds. transistoff. \nd!'peaker Pocket jo'h e. larger Larger Case with Red Bptaker Speaker alut Dial. Dia1. Plan* Grille ami Plan~ end Tuning Parta Parts Price List 'lop (Free... ith parts). (O"erseas P &. P 1l':!5) TRANS EGHT 88TRANSSTORS3DODES tad 3 NEW EDU-KT MAJOR Completely Solderless Electronic Construction Kit Build these projects without soldering iron or solder + 4 " ranslgtor Transistor Jjrpl«c«Earpiece Rh«1!o. Radio. * 65 Tran"istor Push Pull Batterrless Crystal Acnpimcr. Transistor Pn-h Pall ic Bailerj-less Cryatal Radio. Anlpllner. ic Signal Tracer. One Transistor -fc * 7 'j Transl<ler Transi!ltor Leudsjxtlccr * Ons Translator Radio. Loudspeaker MW/LW. 2 Transistor RegeDerati"e Signal njector. Radio 3lWp*V. * 1 TransUlor Receacrallve ltadio. (j Transistor Wa.ve * TraiuJelnr '.rransistor Tenter * ltegeneratin Te~ter h'pn-pnp. * G Tnniisior Short Wave Radio. NPN PNP. Radio. -Ar 3 tadio. Radio, Transistor Re«Qeral ve -ic 4 Tranalatcr Transistor P«sb Push Pull Tfcr Etedtoolc Electronic Metronome. * Audible Contliiuilt Continuity Tul.r. Tester. AenpliOer. Amplifier. * Eteclronic Electronic Nolw Noise Generator 5ensith'e Sensitive PwAmpUSer. Pre-Ampi6er. Componbnts Components nclude: 24 Resistors Capacitors. 10 Transistors. 3i" Loudspeaker. Earpiece i Mica Baseboard 12-way connectors c'onnectors 2 Volume controls 2 Slider Switches 1 Tuning Condenser 3 Knobs Ready Wound MW/LWfSW MW/LW/SW Coils Ferrite Ferrile Rod Rod. 6} 6t 1 yards of wire* wire. 1 Yard of sleeving etc.. Pans Parts Price List Plans SOp. 50p- (Free with parts). NEW Everyday Series Build tbis nciting New erie~ 01 de.igns E.V.5. li Tranlli~tors!! diodes. M\V/LW. Powered hy 4l "olt Uattery. F~rrite rod aerial. tuning condenser. yolume control. now with 3" loudspeaker. Attractive care ",nh red speaker grille. Size 9" x Si" X 21" approx. Parts Price.lst alltl Plans '.!Op. 1-'ree with parts PP & ns. 30p Total Building (+ 8 % VAT 23p) COlts (O\'erHeas Jl," P l '2~) E.V.S. Case,uul looks as abo\ e. 6 TranK8tors 3 dindc!4. PO\l'cretl by 9,'olt hattery. Ferrite rod 3erlal. 3'" 10lldspeaker. etc...llw/lw co,'crage. Pu~b Pull out put. Parts Price Li ~t Plans 30p. Free with parts PP & ns. 30p Total Bnilding ( + 8% VAT 29p) COlts (O\'crseas P &:. P 1 25) E.V.7_ Case ami looks a8 aho, e. 7 Transistors 3 diode". Six w3.,'eballlls. ~rwjlw, Traw-er U. awl. SW2. SW3. powered by 9 volt battery. PUllh 'Pull outllut. TeleNcollic aerial for :;hort wave!!. 3" Louuspeaker.. Parti Parts Price J'rice List ami allll fca-tj' Ea!'y ilulw Uuild Platii l'lans 35p. Free wltti wltb parh. O,'ersca!l P.s.: P Total BuildJDg O\'e r~eas P.\: P 1'85 & Cost (+ 8% \PAT 32p) oaa o ~~:r~::~ht f' ~;~ TONE CONTROL _.:" i TUllable Wa \'eban:j~: :MW 1.. ;~. ) W2,.W. SW. SW?, 5W3 Trawler D. Built in Ferrit e Rort Aerial for ~W o.nd LW. Chrome plated Tele licopc aerial call he :llg1cd anll rotated for peak short wa, c li ~teniul{. 'ush pull oulput u.:ling fioomw t, rnn~i8tor!l. Car at'rial aud Tape record!lockets. Selectivity 6witch. 8 transj~tor8 plus 3 diotles. Latest 4" 2 watt (crrlte magnet loud!tpcaker.air spaced gaugell Luning condenser. \'olume/ on/or. Luning. wa\'e cballge &ltl tone controls. Attract!"e case in rich che~tnut flbade with gold blocking. Size 9 x i X 41n. npprox. Ea9Y to follow instructions ami tiiagrams. )arb priee list. plans 601) (l 'RBE «\t"ith uarts). Total buildidg colta. 6 "98 P ",~ na. -7p O"ersens P.&: P 1 85) fj Tunl\ble \Yavebs: ~lw, LW, SWl. SW2, SW3 Tra,,'Jer Uaml. 8en.llliti\ e ferrite rod aerial for ~t.w. L.W. Tell~scopic aerial for Short Wave*. 'V3 n~. 3in. impro,'ed transistors piu!'! diodes. Att.racti\'c case Cftse in in black Sin, Speaker. with red 8 grille, mproved dial type traiuiatora nlu.i 3 diodei. AtiracUve black knob? knobll with polished polisbed metal nserts. in!erts. Total bojdia? buildin~ coit» COlts Size Size 9 * x 6i 6! X 2}in, X 'ludo appro*. approx. Push PU!lh null pull. 4 O /f. / 48 O BuQfl this eaciuni New ft Tunabla W'»vebanil«i MW, LW. SW1. SW2. aw3 Trawjer R. Senaiilve /errlte rod aerial for Sl.W. L.W. rekvcopic aerial nr Short Total bojdia? coils output. Battery economlter switch for TPS: extended battery life. Ample power to 4-48 P P & ns. 33p (Overseas! i P 1-25) output. Batterr economi,er switch for ' P &: ns. 33p extende(l battery life. Ample po'wer to drive a larger speaker. ~peake r. Farts Parts price list liat ( + 8% S6p> 36p) plans 35p 3Sp (FREE with parts). (Ovetieoa (+ ver.icas " VAT )' i & p 36 i> 1) ~5) parts. Ov«3ca.' P i: P PP PP" : nn. n. 31p Ovcf-ca? V Jc 3lp Pfl-W t+8% VAT 32P) 6-98 ( + 8% VAT fi6p) ROAMER TEN WTH W1'H VHF NCLUD. NQ VHP HCLCD- NG AS02AFT ARORAFT 10 TraaaFilon, taieii 4-2 wtttperrlte BigDe! 10 TraDsiltor Latest 4" 2 watt Ferrite lagnet Loudspeakers Loudipeskers. 9 Tunable WavebaDd lwl, lw2, LW, SWl, SW2, SW8, Trawler B. VHF Local Station' a110 Aircraft B. On some cases the grill pauern will be horizontal bara not as illustrated Built n FerrJte Rod Aerial tor bj:w/lw. Chrome platcd 7 section Telescopic Aerial. can be angled rotated for peak short wan VHF llsteniog. Pusb Pull output using GOOm~V Transistors. Cllr Aerial Tape Record Sockeb. 10 Tran!!iMt.org piu!! 3 Diodes. Ganged Tuning Condenser with VllP section. Separate coil for Aircraft B. Volume on/off. Wa" e Change tone Controls. Attracth'C Case in black with si1nr block lng. Size 9" x 7" x 4". Easy to follow nst.ructions diagrams. Parts price list ami plans iiop (PREE with parts). Total bdllding cosh PP.t (O\'erseas P &. P 1 86) ns. 62p ( + 8% VAT G8p) " EBU KT" Build Radio Ampliflen. etc. from ealy tage djagram Component. include: Tuning' Condenser: 2 \'olume Controls: ~ Sleler Switches: Fine Tonc 3" MO\'iog Coil Speaker: Terminal Strip: Ferrite nod Aerial: Datterr Clips: 4 Tag Boards: 10 TransiNtors: - Diolles: Re.!!i~tors : Capacltor!i: Three!" Knobs. Units once constructed are detachable from mm. Ma ~ter Unit-, enabling tbem to be stored for future use. deal for Sc hooj~, Educational ~\uthorities m all t hose intere~ted in radio construction. rarts price list.:mu plans -lop (FREE with llarh). Total building. 5"50 PP & ns. 33p costs (O"erseas P & P :1 86) <+ 8% YAT 4-1p) RADO if!' ] [11 EXCHANGE :t3~:,!)~~[fj 4. LTD ill Callers»ida lide eclrtaeo entrance "LaveUs" shop. * <1 LaTells,, ihop. * Opaa Open , , 2i!oo.-Fri, Mon.-Fri Sal. To RADO EXCHANGE CO., 61a HGH STREET, BEDFORD, MK40 SA No ROAMER SX CASE ~A:!a~~D AND ;a~'~ tooks '~a~d~~ AS Tel.: Reg. Kc. 78B372. TBABS-EiaflT i Trawiei. ~~~~;\~~~~. 8W2. Trawlel b?, b plus plus an a.n extra extra Medium C waveb Tunable Wavebflfide: wm'eb for for easier e;lsicr tuning 31W, LW. tuning nf of Lutctiibourg, SW1. swa. t Luxcmbourg. enclose for...,......,...,...,.. *te. etc. Sensitive Senslti... e femtc ferrite rod rou aerial aerial telescopic aerial acrial tor for Short Sllort Waves. W3\ C9. 3ln. 3in. Speaker R napes 6 stages-6 tran*l$iors tr~n!listors 2 diodes. diories. Attractive Attract.h p. Wad; hlacl: case case with "'ith red red Krllle, ~rill e. dud dial black metalinsertl'l pp.\: n!!. 3p Name......,...,.... aizo Size o knobs 9 x 5^ 5: ;< with x 2}to. polished 2l!n. approx, metal approx. i'lnns nserts. Plans buildinr Total building 3-_ 07 "MK fovuncas r P S ns. 31p (O\'~rseas parts price prjcelisi list 35p{FREE (FREE with wit,b parts), parts). coan co.t. UM f 1:>.'<, p P d-ajj 1 85) ( f + 8% VAT 32p> 32p) Address...,...,..,..,... (Dept. PW2.) PW2,) ~~~~~~~~~~~~~~~~~~~~"" P? To RADO EXCHANGE CO., 61a HGH STREET, BEDFORD, MK40 SA

3 PRACTCAL VOL. 50 NO. 10 SSUE 818 FEBRUARY 1975 WRELESS...'.}...,. ": WRELESS..'..;..."...<': BRTAN'S PREMER MAGAZNE FOR THE DO T YOURSELF DO-T-YOURSELF RADO AND ELECTRONCS CONSTRUCTOR EDTOR Llonel Lionel E. Howes, G3AYA Y A. ASSSTANT EDTOR Eric Dowdeswell, G4AR ART EDTOR Peter peter Metalli i PRODUCTON & NEWS EDTOR Colin R. Riches TECHNCAL SUB EDTOR SUB-EDTOR Bill Tull Tuil TECHNCAL ARTST Alan Martin SECRETARAL Jenny Maunder Susan King ADVERTS. MANAGER Roy Smith CLASSFED ADVERTS Colin R. Brown Publlahed by [PC Magazines Ltd., Published by PC Magazines Ltd., Fleatway Fleetway House, Farringdon Street, London EC4A AD. 4AD. Tel SUBSCRPTONS SUBSCRPTONS Publisher's Subscription Rate for one year to the UK s s f3'25 3 ' to the real rest of of the world 4'35 35 including poblaga. postage. Enquiries to Subscription Department, PG PC Magazines Ltd., Carlton House, 68 Gl, Gt. Oueen Queen Street, London, WC2 5DD Phone nlernauonal nternational! ' Giro faesfities facilities Account No Please slate state reason for payment "mes- "mes sage to to payee". Binders ( 1 ( 1' -34)!nde*es indexes 30n 30p (inc. VAT) T) can be supplied by by the Binders Dept at at the same address. BACK NUMBERS BACK NUMBERS We regret that we we are unable to to supply beck back numbers of of Practical Wireless. Readers are recommended to to enquire at at a public library to to see copies- copies. Re- Re quests for specific back numbers o! of Practical Wire Wireless lets Television only can can be be published n in our our CO CQ Column. NEWS & COMMENT 890 POLLUTON-Leader POLLUTON Leader article. 891 NEWS... NEWS NEWS TELEVSON-Coming TELEVSON Coming in the February issue 915 NEXT MONTH N PRACTCAL WRELESS 921 ON THE AR 921 Amateur Bs-Eric Bs Eric Domteswef/, Dowdeswell, G4AR 922 Broadcast Bs-Medium Bs Medium Wave-Charles Wave Charles Molloy 922 Short -Short Wave Derek Wave-Derel< Bell 929 HOTLlNES HOTLNES on recent developments by Ginsberg 932 PRODUCTON LNES by Colin Co/in Riches CONSTRUCTONAL 892 ELECTRONC HOME TELEPHONE EXCHANGE J. EXCHANGE-J. Thornton- Thornton Lawrence, T. ng. T.Eng. (C../.).E..) 901 MODEL CONTROL BY RADO Part RADO-Part 2 The 2-The Controller f. Controller-F. G. Payer, Rayer, G30GR R 909 ELECTRONC SLAVE FLASH A/an FLASH-A/an Ainslie Ains/ie. 914 TAKE 20, No. 68, 9V POWER SUPPLY David SUPPLY-David Andrews 916 P.W. 'ASCOT' 'ASCOr STEREO CASSETTE DECK Part DECK-Part 1-Keith Cummins i & Tony Francis 924 P.W. 'KEMPTON' CAR STEREO CASSETTE PLAYER Part PLAYER-Part 3 3- Keith Cummins i & Tony Francis 930 SNGLE FREQUENCY AUDO OSCLLATOR A. OSCLLATOR-A. Foord 938 LOW FREQUENCY AND MARNE RECEVER Part RECEVER-Part 2-Charles Heath # OTHER FEATURES 913 COMPETTON 927 GONG BACK Earlier BACK-Earlier days of Radio Colin Radio-Co/in Riches 934 SPECAL PRODUCT REPORT HEATHKT REPORT-HEATHKT GD-39 ULTRA- ULTRA SONC NTRUSON ALARM 945 TECHNCROSS SOLUTON No. 8 COPYRGHT AND QUERES COPYRGHT AND QUERES PG PC Magazines Limited limited Copyright in n all all drawings, photographs arlicles articles publlahed published in in "Practical Wirefess" Wireless" s s fullyprotecfed protected nd tapfoductron reproduction or or imitation n in whole or or in in part part is is expressly forbidden. All All reasonable precautions are are taken by by "Practical Wireless" to to ensure that the the advice data given (liven to to readers are are reliable. We cannot, however, guarantee t it we we cannot accept legal responaibillly responsibility for for t. t. Prices are those Current current as as we go go to to press.. We We regret that that we we cannot answer technical queries by by telephone nor nor can can we we provide nformation information or or advice on on manulaeturars' manufacturers' products other than than that that given given in in the the magazine. We We will will endeavour to to assist readers who who have have queries relating to to articles published but but we we cannot ofisr offer advice on on modifications to to our our published designs. All All correspondents expecting a a reply reply should enclose a a stamped addressed envelope. 869

4 HUGE DSCOUNTS An &J '50 carr. AKA TAPE UNTS CS 30D ~:~~ GXC D.!;r;;; *- * ON LEADNG ALL AtL BSC RSC PRCES KCUOE NCLUDE VAT BRAND H-F H F LOW DEPOST CREDT TERMS GXC36D GXR 82D Full labour material euarantees guaranteex for f 11 months GXC DS OS List Price RSC Price GXC 38D fl0DB DB(Dolbv)[ DB^ib,^ WHARFEDALE DENTON Pr ( D O ib,) l GXC46D : L [ WHARFEDALE LlNTON UNON Pr, Pr GXC40T CR 81D LNEAR 202 AMPLFER 39 [ GXC75D GXC CS33D ROTEL RT222 AM/FM Tuner GOLDRNG G0LDRNG GL72 T/Table& G Approx. v.iu«value C^6> 46) c-w cwr.rsp Carr, Carr. 75p 7Sp ROTEL RT GOLDRNG COLORNG GL75T/Table & G <Aopro».viiucftsjc-.r, (Approx. Appro*, value v.lue 6S> 65) Carr. Cm. 8Sp 85p ROTEL RX50ATuner/Amp PONEERPLl2DT/Tableon PL2D plinth & cover list List LEAK 2000 Tuner/Amp BSR TD8S 8 track player. Special price Wharfedale Denton Tun/Amp T/TABLES with MAGNETC CARTRDGE/PLNTH & COVER RANK 150a Stereo System GARRARD SP25 MK V with G850 Special Price (Cm. (C.rr () ci) Atio Also Shure Carfrridee*, Cartridees. Basf Bast Tape, Tape. Koi* Koss H/Phones, H /Phonel. etc. Prices of above correct at Nov RANK BD2000 Rec. Price (Carr (Carr. () cu FANE H-F LOUDSPEAKERS AT APPROXMATELY HALF-PRCE LAST CHANCE -' UNREPEATABLE OFFER' NEW ' BOXED' FULLY GUARANTEED for Hi.h.Fidelity High-Fidrliey NOT Group Di.co Dileo u>e U. Available by Mail Order only due to small quantities of some models,. SAE for leaflets. Please Pleale ltate state impedance required where not ind. 51ml,1 Al ollo 1 'rt-r "rk,',>1.-1,-.\1.,01, " 'fl.v 'ri,'" Jiml-l ~11\1 t" Vrkv Prit't' JM,. ~ H ld lrkt ivcv Jlmlrl ltooej Prkr Prict" S.i.l-1 lloclel Frkr J-rk't" :\utl... Prlrv rkl ~ Mmlc! llotir.j Price r.lis 511. ts «u7tnn "",T "n l-.!!)lll " }," 131J f3-17 M(101,1 13~/O.1< M/4T.1! '38/16T.' 4 Prfc* 14'88 88 Mmlel 'Ja/OT.i: 12"/OT.1: 19 Prk* Ji*Jel laaimal 122/1H.1: 8 Prl«v 8,52 '1>2/12.' ' Bi ro,,,; J"! ""'1 43? 4'37 21/0T ' 21/1"'" 1337 f3 37 3H/10T. 13H/OT.1< 12' DJiOA ««52 Mcxtcl >2/1".,1181 Prj«1011lOA /12 M /14 152/13 12U 'JU/lOTl.U 122/12 < /(4 A Lit 132/12 A < ; 1,08 """. H8 '/11 3'58 f8-55 ' /12.. f /1H 110'58 11>2/" Ut 88 not ll! ii's 80' 3-63 '83 inn- ""', ' /11*1' 121/11'" /11 3,78 133/lll.J: 13R/. " M/J 18'87 101/ /14,5 - S /12A /17 < /14 < '74 22/12J 122/ /121> f /17.4 f /17T!0 :!,J/17T '" H8 HO 3 88 '3-60 llnnl 10'''; /15 12'/ /13 Sr/ 'S3 122/ < /17.1 < /17 'H8 122/ /12'T 708, l:i K2T ~O'" 3 3,82 82 W- 1110' '83 121/ m/151.1' '33 13a//3J.ll 138/.31." 415 fu5 122/10.5 '22/10.' J22/J2T 122/1211 <6 88 -PJ/17T <10 59 < / / / : 122/1Ul.1: < ""-'l HO'. 3, : 5 08 :<~/ O. 3R/15 U.22/101.1: f8'03 122/14.\ /11' 8 28 Hlill Hflll 2,56 Jflt:i.H 4 37 J : t~/o'l' ~ /J:i1.1 : " 83 " '48 1~.!/14LH se'18 jj~/l ~ Mkll 6-S h ~:~ ~:.::~~. (~':;;'.~.~.'.' Con'rnls: Bass. Trchk'. ~llj B ~ ll. 10 Transistors Diodes. Outpul ME8 13 X 9t X ~!in. l'9s} Both cut for 8in speaker ratin!-! 1. 1'.J :. M. rt. qll4."k~ nlngc c,p,s. Bass Control :. 12db. JE8 16 9,". 5,95. t ; HHi.H.lj H/0T 132/11) /10 38/6J.: / /10T 003 fo-to < / /14 122/14 122/ A <8-47 AW! <6-49 J22/ 4L t < /ln 182/12 152/1" 1112/ < & RSC G66 Wkll S'B WATT high quality STEREO AMPLFER H-F SPEAKER ENCLOSURES -> x <y A Conirols: 1Liv>. Treble, Vol. uuj Ual. ) Trjusislurs plus Diodes, Ouipui rjirlnp l.h.r.m. reiiucnej, range20-20,000c.p.s. BussConirol ; J2db. jes 'ft x?? x 9iri' n «-9s} Bolh c i" f o r Si"- spoakct c -n-- Tfeblu... c m. Treble Crmliol Conlrol -- ~, 13db. Selector Seleclorswi.chfor switch SE0 SEO Sin. 9ill. Cul Cut for loin. Twseier Tweeter CS 8 95»5 s*.. K '. ~. ypj'_ Cryslal Crystal P.U. or Tape/Radio. For ror speaker SEll SE : 9m. 9in. Cu! Cut for 2in. Tweeter ~ ~._ 'l\ii'.~ output oulput impedances impedanccs of ohms. For FO.r - "- ' -.~ '...y.' av ~. J ^tnrd st,ml v A-C*. A.C. nuiins muills operation. AUDOTRNE H-F SPEAKER SYSTEMS W f ') t" t" t b. A Al",cti". itractive Black Silver finished mcial metal Coaaisting CODsisting of matched malched 2in. 12io. 11,000 Gauss 15 Walt Watt S 15 ohm Y higb qualily cross",ver,, eeter. g;_ '.-- {a!j ~~s~~il~~le scih phnc ~~ matching n~,~(ch~fri~nt~~hlk;fx~~ conlrol knobs. high quality speaker, cross-over unit tweelcr. Smooth * COMPLETE FULLY respod extedded frequency 6.95 Carr. WRED KT OP PRlfTED PAllTJ PRNTED ClROmT KCLTJDHO mponso extended fretjuency range /A>OC ^arr - CROUl'r ond COM'JtfiUFNsiVH SMUM. UA^UA.MH 4 XHTHUCTTlU.Va / QT Cite. Mure fdlur. surpruingly surpri.idgly realittic reali.tic reproduction. v 45p Or ~~'~~~~~i~ FACTORY ti BULT ~\til~ :~ N " TEAK f~l'~"'~~~~'e~~~x;~~~~"flo:;h VENEERED OASSET ~;;. OR SENOR 15 S WATTNCLUDNG WAT /O.OC 8.95 Carr. n» AS lllujlmlfl lustrnlel..! 16 18'95 95 or (r \C( ami K H iiiuiielily tlloflthlr JAY\ellh ,12 (Total ('rol.1 flib 1l8 OS). OSK ^ HF25 HF123 13,(HK) 13,000 GAUSS SPEAKER *- 0 " SOn SOp * AUDOTRNE HGH FDELTY SPEAKERS R.S.C. TA6 6 Watt H-F AMPLFER llravy , ~~?!,?rl!~~ i-ohslruflloii. t~)~.nlcet ~R~~l~~~ lif/b fflclfuot ~!~~~,!ryce~!~a~~~~ ccramlo uiaffoetl *. main, operated, Respol!w :O ~O.OOO C.,!,. ~. 8cpu.te nlsj &11.1 Trthlt' ' 11ft awlt,ut' c.'ulltrnl ~. :t nput, "ui: k,' l lo fu' 'iaslkljipsl 1'1:l!'itit',,{',1 (Nuir ( '1111" nurrkinul " l r r " l1l1l. 'Tl" "'" uc "T" (f Jijd r«te» hulhatu Tweeler 'fwt'der Code Sepwsfr Kua AC ami mtlits Trclilr op«r»nj. *ilk ami KcBpoiiHn rul' cohtrxln. nu-'jo.uoo a h.pul e.ii.n. >un-ki-t- MH. O-r CUDf' )lk~. Grain. Radlu ut Tap('. lljllt l>dp.ctor.wlh h. Olllllllt (11' jti»v dlnjr 'fmidllll:" t>l.:h 1.lell n,!","u'y rang,. tlv to 15.UOO C,p,1! lnipfilotirifxli-tnlcu -t.ir B f. rn-41 ohms. ll-dry 1 PLEASE ranjtc ii i STATE lu fi.udo CHOCE, 3-J5 ke, 15 ohm Grant. OUlllpkl'l', *pkr«. Hulk.. 3 a*.,ft 31a:l. ani-hirllyf Ta»p, Znpul 1lt'1U~lh lt~ 3mV. X-1'itur 5tn'-. <>/!» O/ll nllnx bki-i. ralln~ Z.U.F.M. Oulpnt '. 1'11. j-;n<-h>m-. J.U gllt ' lo~. 1,-i«5i--n.>l, U l,.1,., it, cnct):""1.1 Ejceptlontl E~~e~~~al";~~~rm~~:.A:~lo!T!~f DrrlcrmaacB ai low cq»l CHOCE, 91 * 31 >. r.}lu. Uilrce nulfh faola 10} 3»lii, ~~e~! ;"t, 5~h'D~lh~:~:~ f:~~ ::!tr~ct~;~ :.95 nr. m FACTOEY BULT HFBOflT (~~r;: FA~~~ (s0lt HFSOST 8" S" 10W OW titt 12 ~5 HPX20D HFllOD f WW UW <0,8'50 60 Cgcapkto hit, wiriot dlzyrtnu tr,i UutruoHoai. 7«y5 il) HF102D 10" OW 3 HFlte 18' 16W 17'" HF120 HFOD 12- JO' 16 J0W 15W W < HFgOD HFlffl HF18eD lr 12' U ' BW fiw 15W < R.S.C. TA2 MK 6.5H WATT STEREO AMPLFER AUDO FDELTY MODEL 80 H-F SPEAKER eryatal l-'nllr TrarwJjtorfaeJ. or ecramle P.1-. Tll-vi fartrlrtfv. ofr or 6-3 Radio wafla Taner. ytr cbomicl. Tape Rec. Oplliiuiin rtr. nput jterfoniuncc Sel, Hwitcb. wuli Ba«*, any *\ full fllll UMW (';U.:" "111.,.111. ru 10 tarlt \\nlt. ttti) Ul fwr fur exc»hrl«t ex~~lh~ t "Uinil Jll1nlllllla)Ur. nuihfy. {11 aultaur,u!table /l^k\ Treblf, Vrf, & Bal. OnitniK COBPLETE KT OP PARTS WTH FURL /T OC tirr. euvl'umr*. ('1,,'":o llrf.'. fli-ll 11,,11 r.v.c. J'. \'.C, vorn COO aurruutitl 8urrouud anj anel }ui>u Ulllf llirww throw rnlc* voice wit coli ff w n lu khiipttb ul"ld{',.. vrrj "et> (uw lu\\' futulaiiipnul ftu.lt'utal tpquimiicc rc 50nallCC f ut 30 :i0 c.y.!, c.p.t, Tweeiei TWf.'et.el f' i^kv Ftclwy, ri WRNG DAORAMS & HSTRDCTONS ^ Pi' 40p. fiilni ('(ltl' N h UK Otlill c,l " lu vxmul c:\.'wl lit«h hl..:h lint«rrj{«risv, uote Frei ii({jrp r ~'s J,toll!ll'. FrCllllct"' Y langa'.'fl rang.:.!6 Hz 11% ta to Jl 12 mtu* bout giiarault*- """ 1 X tlo'o A L OrloTMk Vanatr lioijilnx fio KC <2-80 & ftofal M * 8 <22 ml 6D>. My p»mu t, 1r. Kill. K'L. 1::1... ", l U,ll1l1, J,,,,.lull' e tt lfi (/. U. J ".50 S() pj ('a , ii ", JW AUDO FDELTY FR1 SPEAKER KT MODEL 93 B" 15w. wllb partdlic Twfteift. <5-9*1 cu./in MOD~L 83 8". ~W, wlt ~ p~ra~tle Tweeter, ~. f;:~;.9l'a, OC FtrMKin-.- L'.s lit..»: K /. UaiiAR J3t.lHH> ii, i K-L&i). 11 U*73 pr. l,r. mp. >t«9iion«e uHr-15K!l2. obm*. W Ua.** Ktlln^ 'nlt- wllh 15 walla P.VX". ti aealcd Cone aurrouod cabin*!. f»>t ultra low maiiiatu-r. Preaaurc Twe*!er. Printed Clrcull. liiducuve/ll«i'«cilh-e H-F 88" x5" X 7 watt LOUDSPEAKERS 1*1.01; Material. Mt-rrwB- Terminal CmM-orcr. Panrla. inrrinlng 04 v ft. 70 O wlih witb pirftiilic parasilic Tvtcelor Tweeter 8 oben obm imp.poil Post tad Ptckine Packing SO? 20p Ov %3 SPECAL OFFER 1 4*99 Pafr Caii"^*e. R.S.C. Mklll SUPER 30 HGH FDELTY STEREO AMPLFER 4 Y0RK' HGH-FDELTY 3 SPEAKER SYSTEM BULD AN AMPLFER WORTH APPKQX1MATELY ^ ;< x loin. approx. DOimi.F. THE KT PRCE NCLUDNG CABNET Moderate size only 25 N 14x fljn. epprox. Only high grade components by leading mamjhclurcrn 1 * Respoose Response 30-20,000 c.p.s... mpedaacc mpedance 15 ohms wilh Push BuUon isclvcfor Suilclilng amnpnclic.0 o a H Performance comparable with COMPLETE KT l For or p."7 r).lack Socket lor Hcadphonrv <Vramic Ceramic Piek'Up> Pick«Up» O O V units units at at twice (wtce twice (he the cost cost 25'95^" 25.95S,s~ ' H n lb. v. Neon ndicator regard low c«of Price. l)elk~it.:-1 7 nllll H Jlullthlr Uty uu'ub '3'12 t Tutal UHS7) Safin Silver Finish Mvlal Output Uulput tper (per chan- COMPLETE KT Oonalila J>eiH»*lt W-Tl eoll81sls %»( uf ill nml () J-Jn. K inulillly 1~ln. 5w law (lau payntrnta HalS unit 11Ult with <3-12 cut (Tulal cast. chaisla. C2S chasbls. Boll B7) j) )toll L H Solid Slate Circuilry. oel) 15 isatls RMS (less cebiael). rtnn.tf rubber cunc COliC amrtunnfl Mnrnmnd for ultra low reaunancc. r~lunallce, (2) 3-was- 3 way % Twenty Silicon TransistofN TransistorN»nto KJ*,. Pre- Carr. 70p. * / / ulj quarlrr quarter lectloll tlericy ('MSS uwr ayllt~m. 8 5in. biih Four Diodes, Diodes*, Four Kecfifipr^ Recfifiprs qucncy Response Cabinet if rca. Ta A/ flux aecl<mi aerlea cwuli-nvrr a^teni. (3) «x filn. high _J flul: mitmh: rangt' AJK'aker. (") nozue Pr(""surc Twecler. (5) Quantlt.y acoustic tarnpluf matnial. (fi) lanlh;;(jlllt" 'fl':~,,,w,'rr,1 Send S.A.E. lor for 7 Hz to 70 KHz f4-90 extra. "'UU 22 M {3) Quantity mlimfir ranjtc acvusuc ap^altbr, darnplup i4> Rome material. Prewurr G) fan«{iwztii' Tweeter. Teak i run-ml uhhu:l. (i) ( 'i""nit fnll illlltmtl'l". full dcscriplivc descriptive JcaRot. caffci. -i; J4 db, AucmblHl in CSblhrl. 171 tlrruil ami full liiblnk(ii>u>. AMcmbM unit n cabinet <12-60 R.S.C. n.e... ry. TRANSFORMERS, LF. CHOKES & RECTJFJERS RECTFERS Prlmarlt. ZOO-86o.. " d lq,fr ', " 4 whnf belenhtb BELE1fTUJ 1DGET ~~! X~: x~li... TOP BHROUDED DROP THRO' TYPE RECT1FEB8 t'5t»v.. MDOEr CLAMPED TYPE?S x * CJln. TOP SHROODED DROP-THBO' TTPE CBABQER TRAN6FOBBZB9 0-9-lflr. J* ~50,-. 601ld. 6 -:,,. ~a., ,'. iuma , ". 2&. '2.25 F. W.tBridc041 V.'O-ti-V.Vn GUi.iA, ~~O-(l ~;'\. nm.. fi-3v. ~i(tlld \ G-ai '-'.t -,.. n ':h '!:~ < n eo * % v. JMraA. TOmA, 6-3». ]OOrnA, 6-3r. 2a ", 3'5a Jr. ea. 3 6a...,. <8-60 f2-s5 2t», O SO AUTO il-m; (8Up 3a.E DP/alap 00: 6».f2-«: DOWN) TBANSPOBHEB 6a,<Z?6: Ba.fS CO All ' W "\11 8/12*. - '""dredl fl/l'!."'.».0. D.e : ". 100mA, 100mA. 0-3v. 6 3".?a., <% 6 3,'. la. la...,. < /120* *. fio-bo wall* 2-60, on'bal Ol!Pllt. Ma«. MaJ:. A.C. FULLY UPRGHT liOv. 80mA, 6 3\'.!!a., "1' $ nyul 18\', 25D.0.26Ut. SHROUDED ~C.O-0-2uu \. doma, 601U ~ \, n-hv. OPRQUt,j ':r. 8a.. :.!a., *. MOUNTNG 0,n-G 31'. 2a tz'25 '-' * *, ~ li O 0 260,. looma, floma. 6-5*. 100mA, 6-3*. Va^ 6 3,'. 4a.. O-S-G-a*. 4a" 0-5.«-3r '3f'. 3a. 2a. 3. < '75 OUTPUT 150 wall*. TUANSFOBMBRS H-W 850 walta <5 50: 5011 walt«s-m /,. moot 88p. g., B*. 2 <9p. Up. 2Aa-0-25gr, ~.'S( 0 25(h , 6':h', 4a" ,. 3a, ' ". 6 3, ",. 3a, n '75 3:\, 85p. 4.., 81,. 3UU-0-300». 3UO 0 300,. UOiiiA, 100mA. rt-3rluol1.\.«63v. 4*.. ':1\'. 4a, Sr, 3v. 3a ,3,, 3a. <5-75 3a. < * *. 100mA ,. SOinA, «-3v% J30mA. 6-3*. 4a., 6 3\". 4a., O-fl-fi.3*. C.t. c.t, 8-3*. 5a. 6 3v. la. <3-75 SM. la. Puah-Full Pcnli^le 8 wall* DftCK)-3fl EW4 OP to ft or <1-45 Mp to, BSp. 8a. 6a. 07= 4*. 81a. 17,. MO-Q-SOOv {)(h. :loma, 6 3\'. ("t., G,3,, J:, Suitable for :Mullard Amrolifier,.. 14 :'0 Fop For Mullartl 130mA, lull;ml 310 iilo Amrdilicr 6-3i% 43. C V. 1H..\mplificr,..,.....,.. <4-50 4'50 MO-D-WO*. Builable lor 350 0,350,. 100mA. MullarJ looma, 6-3* ,. 4a.. AmnliDrr....aa r ,',:b, Sa. t-50 <3-75 a 76 Puih-Pnll Pubi-Pu EL«1 10 walta to 3 or 6VG. B ft 3-5-S-lSft watu <2 < LF. L.P. CHOKES *. 3~O \, \, S 3\'. 4,.., 05 6 '3" ' \" _"-. 6 3v..aa 0 G 6,3,, la \OH. 250 J V " (iiA, 100m A *. e-3v. 6 3', 4a., 4n...1:1.., * *. Sa \-, 3a < FLAMENT *. 160mA. Of TRANSSTOR 6-3*. 4a *, TRASBTOR POWER 3*. PACK «-M Posh-Pull Pu»h-Pull Ultra lfi-18 Linear watti, lot Mtloaaliy Mullard 010, woond etc. <S-75 ft 150mA. <2-10; T-10, JOOmA, 350 loom_~. 426^ ' *. '~!rt\'. 200mA. 200m.\, 0 ft 3*. :,,'. 4^. 4&., c c.t., u. Ov, S,\". 3», 3a.. <8-50 t8 S0 Trpeifi-Jv.l-Sa.Wp: Tn~ ' ". l O'.,:p ; 6-3*.2a-M<;G-3*.3^<.45»; 6 3". 2a. 85,; 1i 3v.3a: n u,; 6L8, KTM. etc.. tar 3 or 10 ft...< R. 200 ft Mp; 8$, r. '25 0,U5\". 200rnA, 6 '3v, 4a., Twice 5". 3a ,; 12v. la, or *. 200fnA ". 250mA. G-3* ,\, C-3v. 4a TKlc<i 6 3\,. 4*.. 4a" c.t.. c,t" 5*. 0v% 5v. 3*. 3a, ib-70 3a, v. 6a. 2 25: 12*. la. 9Bp: 13*. 3a. or 21*. Poib-Poll 20 watt high Quality MClloaaUy <0mA. Wtl. 400 i8 00 -Oa 12-85:0-9-18* liall-m; 11,85; «43t *12-75.' 2.. 8'76. ' wound EL34. 6L6. KT66 etc. to 3 or 15 ft <5-50 ft 83p

5 Unit. Uniu lilted below (a) DSCOMASTER TWN ~TDDSCO DSCO ^lcowattcgcosystem TURNTABLE CONSOLE with intearal ntcgrsl loow 100W amplifier Ct&-' CONSOLE H F HEAD ncotj)orattn g' twin Gartafd spn M WATT 50 WATT p^ssbs MpfiC (b) PAR OF H-F HEAD- locdrguikds GsrrBTd SP23 BSR MP60 tjpe turntlbl...a Brv. SPEAKER SPEAKER PHONES or BS2 MPflO lypa lurotabkl tod (o) (c) MATCHNG HATCHNG DYNAMC SOBolaoD Sonotone or Acoi Acae Cartrldsei Cartridge. with 'HKE' 'MKE'faiiached (attached to h'phone) ditmond diamond tym. Separate VoJ. con.. 50 WAn troll for eacb turntable. Alo 3b" J ^/thpre-amp" (d) PAR SO WATT SPEAKERS tiolt tot stylli. etch SeQlratc (utqlthl*. Vol. coa- Alio Black MONTORNG FACLTES. p»».: POWER AMPLFER Blacfe Rcxinc covered KOlTllORfla FACLTES, plot Treble Ba.. Controll. Separate Cablnels Cabinets Size appro*. approx. nput TffiWe for tnd 'mihe* Stu Conlroli. 'mike' with vol. Sepiitta val. conirol control jilliiiilijiiiiiiiiiiiiiiil^ii ^ -vx 1 S" (a) (b) X S" (c) XS" witch. VYDide covered & Ctbioel with Black lid, c»e Vjcldc nrtrx covenl f\r (d)!s's' 159'95 Car,. e3 00 lllditrtllon Cabl.etwllh mu.ttation on lid... e OD lolt. lelt. r 1 / Da QU DEP &18& S fortnlbhtly. fortnightly. Dep. 00 Sforlolphtly Or Dap fortnightly pymlr. tnd PYlDt «T- tl vv tju payment? payments of ' (Total 183 S3 93). 93), M (Toltl (Tota) 9-B8! 91-9S ) Corr. Ca" HO TD1S STEREO VERSON OF TD2S STEREO VERSON Tcrllll:1, [Complete ABOVE SYSTEM OF ABOVE SYSTEM Tcmw- Dep HEADPHONES a"cllb 115'00 with lid MCROPHONE : 18 Or fortnlrhtly DKP pymt-. 11 / 7T.7J 00 0^ aar! 18 fortnlrhtly ft\ C.Of) 1111 ttoul 9 03) C»rr. Co.rr, jiarment# 0-51 t l 1 J " < Total ) Ctrr. Ca". l ' v DSCOMASTER TWN TURNTABLE POWER CONSOLE FANE ULTRA HGH POWER LOUDSPEAKERS OtTTtxd Oanatd 8P2l5 MoDonald MP60 tumtable6. Soootane Acol cartridges dltfoond 8P25 cuamond etyll. or tyll. FtcllltJei JoDontld Facllltlea as MPfiO Aa TD Console LurtiUblee. Con80le l»ut but wllb Sonotone " th built-in or bult n 100 Aeot watt ctrtrldgcb Power with Am- Ctrr, 2-60 Ampllfter. ooraplcio oomplete sr th with 1M. lid. Or Deposit '95 96 tnd d 18 fortnipbtly fortnightly ptymente payments B (Toltl (Total ) High Hhrh flu* flux ceremlo ceramlo nitbotlt. magnets. ALL CARRAOE CARRAGE FREE. 8TEHE0 AJJ All power powe, rtt nc»tte ratlnr. aro n.m-0.oontlnaoo«, n.m.s. contlnuoll!'l. 2 TEARS' YEARS' OtTARARTEB GUARANTEE plifier. ~i:roei>aster 145 r~or.f:i8:.~~). ~~r/~3ortnlghtly P),"'!' 'POP' \ DSCOMASTER f\az (Tolal or DBF tnd Cm. 18 W fortnightly pymte tt-16 TOP* 100 'POP' 60 'POP' 50 _ 18" 100Watt S" 15" 60 Watt 12" 50 Watt R.S.C. COLUMN SPEAKERS ^AL DEAL FOR VOCALSTS &0u.. 14.ooo..u ,au.. AND D1^' V vn saute 14,000 J4,000 sautt gaun 13,0-00 saun e^jc 0/15O All 8/ " All lypii 'nu B 15 Ofami Obm, cotbrsd covered n tn Rarfoo R,mal ted Dd Vyctlc V1Dair TYPE 08/70 PUBLC Fitted ADDRESS i 8 0/SO 2 9 TermllforpB!rsDep XYPP TYPE fl*7 Cl2 tn.dfi WATT*! WATTS Fltt.d two TTPE 12" 26 CB/70 watt 70 Highly WATTS... n.ltlv. Filled hlgb three * "m " utk tiw S Dux D.p: nso B D.p " mt.hly nceptlonally,f, effl.clent..low»,. i, feedback,? howl 5 cbar ^.. 15" Apeakera!6»»lt with Hlrhlr eo.wve power " olce Blgb eou,. «UJ mj Dep: Dep; 880tndS 7J TormsforptiraS)ep.Mepton.llremelrnt lej frrib.ekhorte^r-.^.vrr. «llh high pen.r velce coll mth17 payment. Dep. i2'l7 12'17 tnd payflenh,\ a. a 3 00 At 8 mthly Kf nitbly paymenti monthly paymenta. pymle pyrntn 3* Toltl Total ::;~~:;~~ h4~~n~::x ri':;. ir9~oa:dt: Blze 64" x 14" x 11", Dep. a 'll &: apetkira. " h Tttmt: l s.j ""n" Dtp. *J ; tn<l "t P i 9-95 ' ^ 6l"> a mujiy W'. wvmte n.p. /OO» Jl QC a ' 13 13'80 80 (ToUl (Toui (Total 38-20)!at-20) (Tottl (Total ) 19'63) ~m~.~th~ly~p~a~y~m~.n~t~'~~~' m-lblyptymenti 2 67(Tot.l 8~7~(T:o~t~al~:25~' 2B 211 ~31~):c~.r:'.~6~6P~.~~~~~~~~15~' Ctrr.OBp.,To.tl «90) Ctrr' efip 1;1~ 39.~9~5~1 FOE ib BASS OOTAR. OOTAH. ELEaT. ELZOT. OROAB. ORQAT. ETC. B_A_S_S_G_l1 T_A_R_._E_L_EO_T_._O_R_G_A_N_._E_ T_O_. P~:~lL~R~:~g~~~~~~~~~~B~B' puhfiges 1 PH50 HGH ALL RSC PRCES NCLUDE VAT FANE :~~!: 'POP'25/2.~~~~,12" 12"30W 30W';WEOET~~GH ll!~,~;a~ POWER Ph.icon.isL ' TWEETER B " r Vsa'*" NTEREST on Credit Purchases lp. ~Not lor. 8'95 ",th <1. NOli D5'95 CRESCENDO «"!'-r JJuoGulUruit) t. i l!i. 8*95 w!lh2to4t»(..noii elect, filler mvarlc S5g AiD BM. Guitar use) elect. filter."allable 55p aw pc.qc SJJ REFUNDED settled in 3 months SPEAKERS MNSTREL 8W SW GUTAR AMP. FULL J'ULLRANGE RANGE GROUP EQUPMENT PACKAGE OFFERS lacorportllnff ncorporating Tremolo tnd S" 13" x 8" or 1C 10" Bpeaker. Speaker. Output :lt~::~~hae~ W.A.L. PBAE S PACKAGE PROE 8 wtlli wath R.M.8. R.M.S. ConNouoat. Contlnuou. 3 a Jtolc lack lopule nput. m ror Microphone MJcropbon8 tad nd ALL AVALABLE BRANCHES AT FAX. PR. FANS FHAB J'Alla POP 80 B/4 MK BOW Til L/BPEAKBBd AMPLFER TACKAOE PRCE L/8PEAKER &17,90 laitrasunt. nstrument. Mtim Maine Neon Coniroli: Controls: Voluate, Volume, Tone. Tremolo Ttrius: Term.: Dspoilt paym,nh n.po.u 7'36 ''1 85 tnd 9 8 rnontbly Speed monthly 56'95t;~;'ti ''1,815.ee 15) Tremolo nlsnelly. nten.u,. 19 O >4 A. A 95 E payment* of (Total ) H ~ Termi; Term.: Depoelt DepoU <8 t3'95 95 tod 08 nortbly montbb + M MA J'.A.L. PBAE ao MK.m &47 88 PROR ptymenti pa,menta 2!2'50 80 (Toltl (Total 28-95) 23-95) Otrr. Cart.lree reo «A# W CP # r.ax. PR. FAH PHAE WAlla POP BO 60 HK.ni ao L/SPEAKBHS AMPLFER PACKAGE PROB L/PEAKRS fi5 90 Tttins: T,rrn. : Dtpoilt D.vo'" es oo tnd monthly L** or p,monh of.. 20 (Total 172.(0) ~ 63 '95 BmTr - e~~;'ti COMBNED 30W AMP. ptymmti a «0 {Total 72-40) *73 78 t63 # 75«ll0 FAL MAESTRO AND ~~~Bf:,ES~~~~EARMP. 12" SPEAKER 47' ST. f,~~~' F.AX, r.a.l. PBASE PACKAGE For Letd Lead Oolttr, Gultllr, Mtc. Mic, Or Gram, am, lurllo, Radio. Tapo Tape (Not for ute uee with Bntu Bus nstninjenla) ln8trum~nte) FAR PAR L12/260 PHASE L12/25G SPKR3 50 AMPLFER SPKRS (d (tn Otblnelil PACK AO B PRCE Oablnet.) nc. 83 nputs tnd 2 vol conlrola contro)1! plu* 'Plul Treble A & Don.TREMOLO Ba8H, with taeoclaled &88oclatcd Termt: Term. : l>epo*lt Depoelt 2.22'00 00 end n )2 monthly flontroh, controls. Altrnottvely AUractl,'cly finished tlnlshed n bltck black with tllver-flnlshed 8h er ftnlabed latolt.!ucfa. Comptctalrc Compa.ct "dze ptymenlt payment. ft-fo ",20 (Tottl (Tota) ,(0) 40) ::'0'0 ~ S 63-95"'S Filled Fllted ctrtyinr carrying htndte. hle. Dopojlt Depoalt ami nnd 8 mthly mlbly i>aymcnti«llaymenle 18''16 76 (Toltl (Total 68 U3'88 88) ) RSC'PHANTOM f\*\, rnnntvi au 50* 50' controjt. K~~~~~~,~o;'~!~'T~e~:~~~;e;e~~)~ a Un R anwtiii.aihputt.2toj. Baks. Treble, Presence /qc.nn w 55'00 H-fiO ctrr. ~t.~o HGH QUALTY LOUDSPEAKER UNTS Tercna: Term" Depwll Dello. lt 0 S'OO W A- J: 8 mlbly. mtllly. pymtr. 1'),1111, '6 76 (Tnttl (Tolal flb ). 08). ALL TWO TONE VYNfDE VYNDE AND VYNAR FNSH L12/2 50 WATT Fitted pair of 12" 30 39'95 fqo.or FAL PHASE 50 Mk. Mk.1 ll AMPLFER 50 WATT watt Walt high hlfh Hux flux ipeakera speakers for conservative t.lh nil ratin, Carr. '50 ~ Solid title. atate. 4 " Boptntely Soparately controlled laputa npute Tu» Plue matter m.ater vol. control, rating. control. d.po.lt mont.hly paytt. ot Tota.l G f) () nd. od. But Daa. tnd Treble Controls. Control., P/oleot v«proteotlve Clroallry Clroultry taalftl a,.ln.t lexloue Or dipoill mpedance 5-11 tad 8 8-1J monthly ohms. payu..of Carr, *' Tottl.erlou. Lla/16G 18" u, ' 4500 uu L1S/ watt. _~~ t" outiml ovrrlomllng. Output for Hptsker/n 8 to jfi obmt. Size 17" x L1B/26Q F" 28 WATT 13,000 LB/ Wttt Veneered 7" ;~:t~u\v~e~~oo_~1:3; x 7F'' v,. OA~~U~!f:.~~e:t~e:l A.O. mtlnt. Output G~ fifl watie!:a~~ ohm. Blze 17", llrj»i ~~~. ~~ ' 8~rn: ~erm. O'2 Pa 9"5 '" ~&:~~~!. l i;" 11~t 184',~G xo h~!! : 7.95 nmstflrathi*. Or dtpotli montblt TA7*f<y< Dep 16 ohms Terras for Ftlre. ctblnsl 12" nn«h>1b ohm. /Y.Q^ ~'-. ptrmen ~~~~e~~:~ r 5 : Tolil TO~~ , :: ~:~t : Ctrr. J&r~.O~~~: Free t*** 47 OO 88 tnlaly 18 ~~b~ 118~i8) pymtr " /ll.qc ' *.8 88 earl. ~GP, Ctrr. Appro*. ~~ ~:th~~1l1~ 66]>.Terms 14" x 14' :r~~'~li for ~?orn~l\tll~}j~8~:6f.5 'tlr*. x 0". lep. 2'<5 * ' * (Toltl ib9 83) Ctrr. 66p. B mlhly pymtn 2 06 (Toltl 18 46). & REGENT REGENT SOX 50X WATT 50 WATT AMP. GP30 GPO AMPLFER quality rhythm A powerful rbythm guitar, high voctllhlf, nustlty vocailll!!!, grain, unit A' ram, ztdlo, for Guitar, Yocal nstr. radio, ttpe, lead, For Oulltr, Voctl or mlr. PQQ.Qj: tape. COMPLETE SS"S5 Ler"" 60w 60", Peth Peak O/F O/P rttlng, rating. Not for Btst Baaa Guitar, Group, Guitar. Gram, Radio Tape. A V?. t^two " inpute. 2 *Two Fane heavy heav)' duly duty ht fh blgh fiu* tlux 2ln. 121n. epkrt. 4 npuie. Ortm, 'i Btdto Vol. or epkr.. Vo!. Controlt. Ttpe- CQntrola. PULSAR 100 Ud j ^ ^' our nputs tnd isro Volume Qjrrent Current Vtlvcx. Vah'es. Peikofp Peak o/p rating. raung. ' Conlrolt tont~gl~rfo:~:a~a~r~~!yot for ntitnl uee nf up ~~dt to o ~:~r four plck-uw pi~~: Strong VynEde V)'n de covered cabinet 'SOUND TO LTE' SYSTEM or "mikes". Haas cont roj. carrying hleg. Blackl Send S.A.E. Terml: Bllver ndicator. A'l' WORTHWHJ.. B Nr: NDaend "mlkee", 8.A.E. Jlas# for leaflet. Treble Credit control*, Terms: Sliver with cwxylag Facia. Neon bondk*. ladtcttor. Dlack/ AT A WORTHWHLE SAVNG ON ND Mv n VDUAL purchnsed!cllbrltc1y. Dopoilt A S fnrtixthlly/t^.qc For 2CH)-25nv A.C. For 3 or 16 fl VPUAX UNTS purclifltcl mtumtely. Termy: Depo~lt 1l'4~ H paymente ~::~~!t:~n4 of 416. t5 (Tolnl f:o::[t;i:~~r ).^ epeaker^. Send 8AE lorleafiet. Term*: Dop /TQaQC Termt; '; Ctrr. i~~:~~~8 ~:a~;~:~:n!~: i3~~8~t~~~ri~f.:; 29'95 Carr A 3 mthly pymtt 3 63 (Tofal ) payment* Dcpceit. 2'50 payments N 15 fortnightly '80). 8uper SL REGEMT REGENT SOB 50B f't fo, BassOoUartnd Ha.. Gulta, genertl Ctrr. 76 p (Total nuvum pufpoikr. Or Dep. 10'9S g.n.,,' A }] 000 watt Credit per channel. Price fl3 Mantitl 4-RO). )lanual override Super 8L o,'crride button*, Unit. buttona, purpolles. Or Del> &: 8potbankR n bulhk (3 tlcp. colourtl) fortnightly payment* 4-"8. /RA leadg, fitt units 80ld Bep. t~;t~~t,~g8~~~. p~::~e~~~6~4' OC REGENT'SO* AMPLFER 2 spolbadk* with d bulbs tfi erp. colour*] 6 yd (Toltl 96-00). Carr fcof *7^ At supplied with Regent 60* or nd 10 yd leads, flited plugs. Unit* sold lep. tbfi 60li. Term*: Dep : FAL DSCO PRE-AMPLFER PRE-AMPLlFER STf c n m.^c; 8 mthly pymlt (Total S" 100W Monitoring. Silo. }tc. Jaclc Ja.ck i.t Tape nput*. ndcpeiulcnt Xy- t f.< TTAN 18" loow SPEAKERS OhlUM hupe,lancc Vol. Control. St.l, 2CW.250v A C. Main* oprrthon O vu Ctrr. 1 LST olims PRCE hnpedtnee Ctrr Can 75p. 25'95 ORDERS" ENQURES TO: NEW BRANCHES AT BarclaycBTd MAL & EXPORT ENQDRE5 TO Access AUDO HOUSE, BOUSE. henconner HENCONNER lake, LANE. lebdb, LEDS ~ accepted T.l: Pud", (08735) MAL 8E BOLTON, COVENTRY / M, ac«p DWO 7,1: WAL ORDER MUST NOT 6 SENT TO SHOPS L. All items jublect subject to avallablliiy. a vailability. TEBBS TERMS O.W.O. C.W.O. a, 0' O.O.D. C.O.D.»o No 0.0.D. O.O.D. uniir under at 10. E. & 40p PEa ORDER OR QUOTED. DONCASTER, PRESTON Prices correct ai E. ito.e. POSTAGE (Op PEUCP-DER 03 AS SCOTED, TRADE SUPPLED. H.F H-F CENTRES LTD. TBADE a.a.e, abppmtd, S.A.E. PEASE PLEASE WTTH WlTB EKQUEEB. ENQl1RES. STOCKPORT DONCASTER Quoonlgat Waterdal. C.ntre. aoa Street (Clol.d W.d.). (Cloled Thuro). 6306e rei ' OPEM OPEN ALL BAY DAY SATURDAYS SATURDAVS (5 Da* Day W..kl W.ak) EDNBURGH 3 Quaanaoala. Watardala Canlia. MANCHESTER EOA Oldham Slieat (Cloied Wad.), 101 Lothian Rd. (Cloied (CloiadThur,). (Cloled Wad,). Wed.). Tal. Tel. T B3M MDDLESBROUGH Nawoorl Newport Road (Cloaad (Closed Wed.). Wed.l. Tel. <7015 Tel. 23d 277* North Parade (Closed W.d.). T.l Argylo St. (Cloled...). N.wgate Shopping BRADFORD BOLTOK 10 Noith Farad. (Cloa.d Wed.). Tal. 253M CL GLASGOW 325 Aroyla S. (Cloied TuaaJ- NEWCASTLE UPON TYNE 24 Newoala ShocCna BOLTON DaanioaH. D.anogat. (Cloaad (Closed Wed.).. Tal. Tel. 33S)S un Tol C.ntr. (Clooed Wed.). rei. 214U BRMNGHAM 30/ Greal Great Weilarn Western Arcade, Arcade. " HULL 71 whltalrlaigale Whltefrlargate (Cloaad (Cloaed Thura.). Tal. Thuro.). Tal. 248 Tel <153 NOTTNGHAM 19/19 Cenlra A Markel (Cloaed Slreal Wad.). Tal. 21 <69 Tal, Tel (Cloaad (Closed Wed.). LECESTER 32 HlghSlraaltCloaadTiiura.),Tal, High Street (Cloud Thura.).Tel t2O PRESTON =~lj~~c:.ham 19 / 19AG.M,;;a~r:k,~e,t~ (Cloaed i;;o';,i;~ Thuil ). Tal COVSHTRY COVENTRY 17 Slierion Sh.lton Sqoaia, Squ... The Th. Preclncl, Pr.clnct. LE LEEDS Counlv County (Mecca) Arcado. Brlgg,te Frlarg,te Walk. S. Tal, T.1. 25M (Cloaed Arcade. Wed.). Brlsaala Tel SHEFFELD 41 Frlaroata Wadt, 13 Eichanoe St.GeoroaaSlloaoo Slreal (Caalta Prac. MM. Tal.6199 BldaJ DERBY 97 e7 St. S. Patar-a Peler's Straal. t. (Cloaad (Clos.d Wad.). W.d.). Tel. < LU LVERPOOL Dale S. St. (Cloied (~~~~:~dw~3t)+j~~3:~m Wad.). Tat STOCKPORT (Cloaad Th ore). Tel.207(8 DARLNGTON DARLlNGTON Norlhoale Northgato (Cloaad (Cloo.d Wed.), Wed.). UO LONDON 238 Edowara Edgw,re Road, Road. W.2. W (Cloaed (Cloud Thou.). Thuro.). «mile Underbantr (Cloaad Thiira.). tel. <8W!777 Tal. Tat. 6B Tal. Tel SUNDERLAND 5 Markel So. (Cloaad Wad). Tel. 70S ~- Lll/2 50 WATT Fitted pair of 12" 30

6 : ll Newnes Newnes-Butterworths - Butterworths : : 0100 Books on Radio, TV, Electronics etc... : BEGNEER'S GUSDE TO COLOUR TELEVSON 2nd Edn. King. 2, BEGNNER'S GUDE TO ELECTRONCS 3rd Edn. Edn, Squires Deason. 2, DCTONARY OF RADO &. i TELEVSON. Pannett ELECTRONCS: : A COURSE BOOK FOR STUDENTS. Olsen. 2' ELEMENTS OF TRANSSTOR PULSE CRCUTS. CRCUTS, Towers. 3' GUDE TO BROADCASTNG STATONS. 17th 17(h Edn. 0' H-F AND TAPE RECORDER HANDBOOK, The. The, King. 2' NTEGRATED CRCUT POCKET BOOK. Hibberd. Hihberd. 2' NEWNES COLOUR TV SERVCNG MANUAL. VOL. 1. 1, King. 5' NEWNES RADO ENGNEERS POCKET BOOK. 14th 14(h Edn. Moorshead. 1' OPERATONAL AMPLFERS. AMPLFERS, Clayton. Clayton, 3-70 '70 OUTLNE OF RADO AND TELEVSON. Hawker. 2' PRNCPLES &&. CALCULATONS FOR RADO MECHANCS. Parti. 1. Bravery-Gilbert. 1' RADO &. i AUDO SERVCNG HANDBOOK. 2nd Edn. Edn, King. 3-30,30 RADO, TELEVSON &. 4 AUDO TEST NSTRUMENTS. 2nd Edn. King. 4, RAPD SERVCNG OF TRANSSTOR EQUPMENT. 2nd Edn. Edn, King. 2' RADO VALVE AND' TRANSSTOR DATA. 9th Edn. Ball. Ball, 1 00 t-00. SOLD-STATE DEVCES &. 4 APPLCATONS. Lewis. Lewis, cased 3-25.,25. limp 2' SERVCNG WTH THE OSCLLOSCOPE. King. King, 2' TELEVSON ENGNEERS POCKET BOOK. 6th Edn. McGoldrick. 2' TELEVSON SERVCNG HANDBOOK. 3rd Edn. Edn, King. King, 4' WRELESS SERVCNG MANUAL. 10th Edn. Cocking ' All these books, many more, are available Jrom All these books, many more, are available from : BELL'S TELEVSON TELEVSOr SERVCES : 190. KNGS ROAD, HARROGATE. YORKSHRE. Telephone: W S 190, KNGS ROAD, HARROGATE, YORKSHRE. Telephone: Prices nclude Post 4 Packing (U.K. only). Send large S.A.E. (or FREE booklists. Open until 6 pm Daily 8 pm Saturday i.;;~:;;~~=;;=;;~~~~~;;;j ENGNEERS mm freh YOURSELF FOR A SETTER BETTER JOB dob WTH MORE PAY! Do you waat projaolloo, % better Job, hlghar wyr "No* Oiiportualttw" fhova Do you want promotion, 8. better Job, Tbia helpful guidt> to SUCce8S should be higher payt "New OpportunlUes" shows read by e\o'ery ambjtious engineer. you you how how to to get get tbfra them through through & a. low-coat aenil Send tor for thji this halptoi helpful 7fl 76 pige page FTEE FREE book book low-c08t horoc No will call home Bludy study' oourbc. course. There There are no no books books lo now. No obligation, nobody wju call to on (t be the be~t. buy buy und jou you can can pay'aa'j-ou-learn. on you. t could be tbe beat thing you pay-aa you-leam. ever did. ~_.CUT OUT THS COUPON, CHOOSE A BRAND NEW FUTURE HERE ~ C~~k~~~ Tick or aiaie,~'"~!~~~,,~,ep~, snow ofiniereu. Post to ~~~~!~ tie odd/ess, Mow.!~!E flullil Dulld,Aa-You-Learn Aa-You-Leam ElpctroDlc Electronic CTY CTY AND AN}) OUTLDS GULDS PRACTCAL R ADO Engineermg 0 nstallations AND ELECTRONCS JtADJO Englnrerlng Q nyututlom twith AND kit) ELECTRONCS n Cwnpater Computer EleclroDlca ElectroniC8 n 0 Wiring n Wiring 0 (wth kt) 0 CTY AND GULDS Elfrtxleal Computer Computer El~:\~~rlng Englaeertog Programmlne _ Electrical 0 Programming LJ 0 Technicians 0 Electrical nstallations General GenerBJ Radio Electrical nstallations TV Engineering 0 Telecommunications 0 wiring wiring O TV EogfoMriuff Radio TelecoaimnclcatloDB CTY AND GULDS Q 0 Radio SerVicing, RadiO Amateurs' Eum Electrical Radio Servicing, Radio Amateurs* Exam Electrical Maintenance etc. etc. 0 Draught Draughtsmansbip n ms ftshjp- MalnleDROce etc. etc. 0 Repair? Repa.irs 0 Electrical Electrical Traoaiator hlkibematica Tranalstor Technology Q Mathematics 0 Technology. 0 EPW-Ol f To ALDERKJUT6H COLUCE Dept.EPW-01 RcadifiE RG7 4PF «AM6(aioekCapUBlBPlB*««J!:!~:~~:~~P~~.~~GE. Dopt.EPW-Ol.. Roadin. RG7 4PF..... ADDRESS CUT OUT THS COUPON Thlfl read by hdirful ever? guide ambit to loua succew engineer, ehouid be Oth»f»ubl«ct» Other aubj.c:t. A9» Age AccredHtd Accr.ditod by by C.A.C.C. C.A.C.C. Member of o( A.B.C.C. HOME OF OF BRTSH NSTTUTE NSTl un Of OF ENGNEERNG TECHNOLOGY TECHNOlOGY " tzn LONG PERS5TANCE PERSSTANCE CRT, CRT. PACK-SO new spec. Price 6 SO nclude components, SOp, &. P. 2Op. V.A.T, Full a doc. V.A.T. Prlca Caniags. a» to Jncluda componenfa, CAPACTOR only PACK SO Mp, P. Br & p. sop. naw Carriage. TRMMER PACK. 2 Twin 50/200pF SO/200pF MAKE 10/60pF SCOPE NTO YOUR A SNGLE DOUBLE WTH BEAM 2 ceramic mln, min. elrlp 2 Twin strip with 4 10/6CpF oreeet preset E/?0pF ceramic; 5/20pF on OUR NEW LOW PRCED SOLD air preset 3O/100pF STATE SWTCH. 2 Hr Hz to B 8 MHz. on each; 3 o)r spaced praset 30/100dF NEW. up lot. P. & Hook ud a 9 volt haltcry battery connoct connect 25p ceramic the for. base. p, a ALL p. P. top. BRAND NEW, lop. traces equ. OCP71. Up e.ch. or to your for ONLY scope 6' P. have A & P. two 25p. racea 2Sp. (Not PHOTOCELL (Nol OCP7!f-l0p cased, not calibrated.) MULLARD OCP?O-f0p eqo. OCP7l each. T l3p each. WDE WOBBULATOR. 1 cwt chassis. 5 WfDE MH«MHz to RANGE 150 MHr MHz up WOSBULATOR. to 15 MHi MHz aweep t DELVERED cwi of Electronic TO YOUR Scrap chassis, DOOR sweep boards. width. Only 3 controls, pfeaal RF boards, etc. No rubbish. FOR l'elvdil~' s~~~p 3 wfd~~tr~~sd rrr::~!n~:' 4'00. level, eweeo wldlh frequency. ONLY daat deal for 10-7 ' 7 or TV F aflflnment. alignment, filters, filters. receivers. Can be ueod used wlih with MODERN TELEPHONES type 706. any oenoral general purpose ecope. acope. Full Two-ono Two-tone grey, ' instructions nstructions euoplied. supplied. Connect 6 3V O'een green 3 75 flrey. '15 each Black each Two-tone 3' each- each. A.C- A.C. use within minutes of P. 4 & P. 3Sp. recelvlno. receiving. All this tor for ONLY d-75, "75, deal P.fiR.25p. P.&'P. (Not cased, not catlbraied.) fdeal EXTENSON TELEPHONES calibrated.) stard dial Hx Hz lo to :zoo khr khz WB. with atard GPO type dial, bell coding. 75 &. SNE SQUARE SOUARE GENERATOR. 35p. end lead codinq each, P. & P. Four - ra.nobh. ranges. ndependent amphlude amplitude nserts &. conlrols, 37P. controls, hermlslor thermistor etablllaed. stabilised. Ready inserta HANDSETS complete with 2, each. & lo 2Sp. to use, use. 9V supply required, required DALS ONLY lead 75p 75p eech. each. P. P. A 4 P. P.57p. 25p. 8' 85 each, P. P. 4 &. p. P. 25p. (Not cescd, cased, not HGH VALUE-PRNTED BOARD callbralad.) calibrated.) UanslsloTQ, PACK. Hundreds translators, etc. no of etc.-no 2 components, hoards boards the GRATCULES 12cm x x Wcm 14cm high same no same-no translator quality plasilc plastic Sp 15p each, P. P. 4 &. P. P. 5p. computer boards short t-75 leaded 1 75 post transistor paid. pt Qty p P. &. P.15p Large quantity ol good quality Br Beehive Trimmer 3/30 pf p new. lop ea. Qly. e8. P. 1-& A 13p & p. ea. P. 25p\ p. 4 25p; 10O-K9 P. 15p components ~~~gon~~~~t~ NO NfO go~~s~r~~ PASSNG P. &. P. TRADE - ao so we offer 3lbs 31bs o( 7p ea. P, A P. free. of ELECTRONC Drive Unit. 191n. GOODES for HF Crystal Oflve Unit, 19ln. rack 240V Cl-M Post Poot paid. mount. superb crystal Stard oven 2«V by by Labflear nput with Labgear (no cryafala) crystals) 5 ee. ea. Carr a oo ROTARY SWTCH PACK-«PACK-6 l000pf br new switches (1 (1 ceramic; 11 off iooqpl off n of 30p, P. & P. 4pole 22 way etc.). 50p, SOp. P. P. 4 & R. P. 20p. only sold FEED n packs THRU of CAPACTORS 10, 3Dp, P. 4 P. 10p, lop.. P.C.B, P.C.B. PACKS S, S. a & D. Ouanlity Quanllty aom. 22 aq sq n no ft-no liny tiny pieces. Mo 50p plus ALWAYS some CHEAP SCOPES AVAU.ABL -of build your ownsend for our ruhe tube lief P. P. i & P. P. 2Qp, 2Op. Send AVALABLE ot build list wffh yovic with a a S.A.E. own.e. PLEASE ADD V.A.T. AT AT 1% 8%.., OPEM OPEN 39»,m. a.m. lo to «,: p.m. ANY DAY g ~ CHt-TME CHLTM.ADLTD LTD 7/9 ARTHUR ROAD, READNG, BERKS. (noar (near T«ch. Tech. Colt.o.) Coli ego) Tel,: Tel.: Reading 18W)Si65»ie /15911

7 m in Crescent Quality yuality Uomponents Components BARGAN CAPACTTOB at 83t. DC wkt- DOUGLAS TRANSPOEHRES CLEAR ELASTC PANEL METERS BARGAN CAPACTOR 2,200lFD at 83 DC wkg. DOUGLAS TBA1rSFOlJEU CLEAB PLASTC P AlEL JlETERS Bjzc Size = 2" x 1 1" diameter. Tag ended. All All types stard Size 59mrn 46mrn 3Jjmm these metere require unuittor «unwed. Our 2^ X price U' 35pillanKJtrr. Taj endcl- Ail new AH lypea are rundsrd 240 volt primary. 8li«ftOmm x domm x 35mni theac mctera ttqafre a asp. MT lilt 102 cl et. 0» ~ D 19 - = 22 25» = = 40 - = SO 60 at DOOM/A GOOM/A SAmm 38mm hole for r mounllng. mounting each ME6 0 =0 to micro amp Full }~ull Scale STEBEO/MONO MT237ca M.T237cs al 150M/A 150MA H5 ile7 lle7 =0 Foll 8cale._-C), ltlt241cs M/A.1'06 ME8 ~ O HEADPHONE UT241C at 30H/A fl W ME9 0 0 to to floo micro micro amp amp Full Fall Scale Scale ~1:f.=E VOLUME & -- MTMOcfl MT240cs S-O-lfi al at 20M/A 30M/A MBS ME9-0 "'" 0 lo to 1 m/a Fall Full Scale MT2~9c. 12-ll-12 at 50M/A.1 06 MElO "" 0 to 5 m/a Full Scale CONTROL BOX MT299ca at SOU/A 102 ME10-0 lo 6 m/a Full Scale Piug ~~~~R~~,~~~ ntcrto TWO WAY STEREO MT238c«MT23Bcs at a.t 200H/A 200M/A MEll -0 to m/a. Full phones iniolhl* into t.hi!' ADAPTOR PACtS eoni.romxn ME2-0 (i0 m/a F ull cotlt,rol box ami ~'lcl you ih«n POWER PACES Scale lo 10 w/a Pol! ^ tllt"lt Rt.crl!o.Jack phut to two PP} Swttchc.1 a - R - - 9,'nit 'Tranlll.d.or ncirpofate tncnr\lomte n a. ricrhl fetclllc ri~ht mod PPl Kwltefwl vnlt 400M/A Tmnalator ar.l ME12 -O to fift m/«. Poll ^. anll Kh-reo free Rockets. com.. 7.encr StablllllCd On/Oft Switch.Polarity Re\ ej'fl". left ME3,...,0 m/a Full,,_ ",:~c.,.,; "~ :V ft. hum halld vojuruc \" CliutHC ciio!n«l ^ensr Stal>H«ed On/Olt Bvltch Poiarlly Ueveraal Realc j. C(lt rol plctc ""th 110nnn cable. Switch, l1eud clule 1$'25 an ant! U a Btcreo/iiiunoawitch. Rallrh, in a black melnl cam tji-25 each. MB13 r- n to 100 in n Poll ; ~ ' stcreo/monoswitch. 8ca.lc.«'or connecting two pp~ 6-7l - 9 Eliminator. Approx. Complex Complete wllh.!o!e14 "" jth stereo F.,. PP2 Switched volt Battery Etlminalor. Appro*, Scale m\ ' \ stereo nputs into one. eize 21'"' 21-10' Sj-". deal r eauette recorders 1B 76 jack plui? plug 2m table, lire 21" x 2]' x Si". Ma«4 for eaieette rtcotdere ilel4-0 to 500 m/a Full» cable. ll" '. (phlllp. 3'00). A barpjlh bargain al at 1. each (phllfpi type 3-00}. Scale L- \». A bargain at 85p. ME15 FP3 PP3 Car canvcrter. collverter. From 2v 12v poo, Pos. or Nrj. Neg. lo to = UE16-0 to 1 amp Full Scale volt. Ea*y Euy lo to flt fit ramlelor tran8istor reg^uted regulated 3-90 a 90 MElfl ME6 -OloftQ ",,0 to 50 volte vol1.8 A.C. ' ~~. P HE17 ME 7 *>0 Scale =0 to 300 volte F Bcale MRia A.C. Full Scale ME 8 = " S":ltleter MB19 M'E -"VU" -"S" aieter = Meter )[eter OUR PRCE 3 t8 *00 -DO Q MAX. Q-lAX. 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Kf j 18p eacb 31 x 5 B9p Up is unique inalrumenl LED LBD READOUTS 39p «P The 17 x 2l l Mp 7'1p SOp i" 88p for tbe profesaionaj Lltroolr Ma 77> flop la a Deeon oniquc DWo {nalrnment MFC - A' o, 'Sp / "T" (p LitroniJ: 17 x 31 H5p H8p 75p electronics ('og -&" U p DL707 DLi07.3 Character 14 Pin Dil *100 76p lor the profemlonol % - S2 : K. 1l x 5 l-s5p HOp t" Up enabung him DL701 a8 as above aho\'e hut but i ± 1 SSp amateur electronlca eng-.. g-^ 1l'00 ineertlon ll" 88p lx"...' T ;:" 7211 minutes DL Character Pin lomrllon tool ineer, Chara.cter 0-8l Spot face lace cutter prepare enabling n minutea blm to a ii- aal, 52p t" Sp linitrod 36 plna (8tate 1,15) 25p board H" 80p Segment 16 DU.HS 80p LOUDSPBAKERS U" Sp rey 3015G as 1 ' H8 & fi o? Utaitroa Pkt. 90 pine {elale! or perfect printed circuit L* gxl Sejtuenl 10 Pin Dll hoard 3015f: a* above but ± LOUD9PRAKER9 OUR PRCE epp «" B8p 1 Key ADD LUXUKY TO " Sp Clock Chip '21" 2!" 68 ohm SOp snn lctioei to }' 9» i 1,\." ~~ "' YOUR CAR Sp CT /Lai ~OS/LS DlRiUi Digital Clock/Calendar Chi; Chip Plui 21" 4fl ohm 50p Plus 2 110' 50p with & d1'h'en 1/." full Clrculu CircuiLA nfi^inauon nforma.tion teaoet lcahet St" 80 ohm fiop m ]»!U a YOBtt motor CAE rlelvea 'A Jf» 11M ' j 10 ' Circuils tl'!6 ear aerial Circuits nformation Sheet Bp 5" 0 ohm ceramlo 1-26, ^ b 11" Lit 6i" d a ection 7W 704 L«l Led DJrplay Display lor for above " 8 obm dnal coao ceramic 2*50 SPEC:- c Sect on V/s.* " eioj 1'/3Z" MO UO Key 8 11'15 } Key Or 4 (or for " 6 ohm dual cone cero 3 7S VW l" 11'25 7" 710' X 4" 410' ohm ceramic 1*90 t l O M, length * extended 1 - u-jj "B" h 11" Ha ~~. WAFER SWTCHES 8" x 5" 8 ohm Permanent Magnel Magnet B " *>3gth 100cm Length under ij* if t" 1* lop Pole 12 Way Wa.y. HO 40cm 0" 0 05 Pole 2 Way AWCfc 1-80 K J fender 40ctn EM 13" x B" 8" 450 Kit * Cable lengtb } 2 ~ A, S /S!H "C"lap Pole 3 Way Wa.y yn&z ohm.HO 120cm n ~ Pole 4 Way EM S *EM S" 8 13'" x fi 8"S Kits 8 ohm ' applied ^os, Supplied complete b, " " with 0!l,... 21"»'/«' 2," 4*10 «30 HO rkey "</ ey PANE mgh POWBll LOUDSPBAURS 1ixfng con 2fH ;:;' tp 2 Z Pole Pole 4 6 Way Way yyr FANE ULTRA HGH POWER LOUDSPZAKEE8 liing trol switcb 25/ '50 '7' Pole 3 Way Fop 26/2 30 watt 100 ohm 12" tn> awiteh bracket 7 50 eon- H" 3" JOp "E" ' Yay S:S 60 8/ p each Pop watt 6/1B ohm 12" 1'" E h key 0-10 Top 30 :so 50 :SO wall 15 ohm 13" 12" f " SQUARE PUNCH complete with hey TOP PBBSB PO POTEBTlOMETERS TEN TO METERS Pop Pop watt 8/15 ohm 1ft" 1510' n i?o STOP Pop 8/15 ohm aa'70 BHAOOO2 15 Module 0 '50 types 111 less Carr, LS x 8 r' 60P LS. NE566 T.e. 78p Singles All jpefl " atid lc*a diameter Pop watt 0/16 ahm 18" BHAOfHW PRESS 16 watt Amp S Slnglti Dual Catr. on L/S over 13 * fl 12" fiop per L/S, NE655 Timer.C. 7Sp MC 310P K lan KEYBECTOR K.H8 lo Log Lua or 6K MC1320P Le8S 2ftK 10 Lin Keynector TP 29A 56, 25K Lcia 10K MANS KEYNECTOB 7605 Stereo Regulator Decoder.C. 1*00 11*49 Switch 2&K 25K Less.. t.be supply ~ TP 30A 8ap fiok 15p 3p leconde. beach, garage BC07 lop look 1MK. 60K 5p each 50K Switch Equipment Kcyneetor connects to the mains any ccpply Electrical in 100K look 45p 4$'p each aeconda. demonstrations, )lultl connect ioq.l BC l 08 lop 250K: 2S0K Double dcmonbtrallcno, deal for beach, raragc 250K (max. fused). BC09 lop BOOK 500K Polo can be made (max, etc. iinlu load 13A cooceclloos loacdl Pole 600K M Switch M 13-25p Y.C. SOCXETS 2M SOp aop each 2M AL11JUK BOXES D..L. PRE SETS ALUMNUM BQXR8 M.etal boxes profelllonal flnieh 8 pin flub Sub Minfalurt Miniature Skeleton Type T Watt Borbontal Metal project boxea give your work a ptofeaalonal On lib Horizontal L 14 pin U, Mounting 100< loo, 250 WC SOO ohm. ohm, k. 1k. 2 5k. ajc, 6k. Sk, 10k h W H 2t 5t 1 25k, 16 pin ftok, [jok. look, l 2aok, ~5 0k, fiook. SOOk, 151 un ohm <Sp 8p each AB7 21 U Mp ea.ch AB8 4 ~ p 83p MANS lams TRANSFORMERS AD9 AB9 2t. Mp Open Type Double Wound Conllmioualy Continuously Rated, two t AE10 ABO * BJ H. 83p hole fhlng fixing clamp wllh with colonr colour coded Bring fl ying leads, tide, Taroieh 14 Mr "'arniah fadl /ABll 4 2J 2. 2 Mr Up BARGAN TRANSFORMERS mpregnated. impregnated. Appro*, Appror. atee: size: H" 11" x 11" x 1 "." high AB12 AD 2 2 Up SOOm/a Fixing Fir.ing centres! centres: B'/m". 2 5 /J./'. AB3 ABia Sp tjd volt 500m/a 8911 TR1 primary bargain. TR 2f>-0-20v ~O-0-20\" JW) m/a. AE14 AB Up TR v \' 100 m/a All AB5 6 3 Mo 240 volt primaiy transformer bargain, ABlft 8 8 MB 8911 approx appro* size =60mm = * x <0mm 40mm * x 50mm TJ13 TR \' 100 ioo in/a 240 Volt AB16 AB S fixing = TK4 TR v fo m/a Primary AB17 10 D 4. 1-GB TRS TR V \. 100 ] m/a 4k 103 fixina centres 75mm AB16 AB '20 il!0 Our Price - ( = Our Price S1' each ADl9 A B J ' volt500m/a SOOm/a 00/25Or 200/250.. MAWS MANS RELAY ABS ABfl PLASTC BOXES. Jfeav? Heavy duly li n t y contacts 2*500 2'500 ohm coll. coil. AH All new nnmed unused Hybos:e8 Uyfaorra for conetrart construction loo project#. project.e. Moulded ezlnuion 240 volt primary transformer bargain, extrusion JM'.D.T. D.P.D.T. mains rclaya relay8 sop, 5Op, Coir, Can. Free. Jtrce. Special qnantlty quantity tafle railll tor for F-C. P.C. or chmnls chaaala puau, panels. Fitted F with 1mm mm roat front approx size 60mm =60mm x 40mm x 50mm per 100 }06 ofl. off. panels, panel8. fixing centres 75mm = loos = MinATURE l O[jrnm 73mm 45mm = 61p NATURE RELATS 1905 RELAYS =,00. Br 1006 = 150mm 75mm x "'" ea, new range of BrKish British made Relays, fllze Size 11" X » 105mm! 73cQm 75inxn x X 47mm 45mca - flip Mp Our Price = 100. x }{}07 = 124mm 60mm = Mp BARGAN 1" 110' X x 1". J". All fwo two changeover* changeovers with h 250v l*fta 5A ccmlocu 1097 conta.cte = l 06mm x (1oping' front) = 60p Loud buzzer mounte(l in metal complete t eultablo suitable for BttiiiK fitting On on - m 101 Veroboard » loomni 184mm x * 74mm 124mia x x 45mm fiomm {aloplng - 96p frorl) > BOp»ud EARS huxzer All BOX mounted n a mctel box cocnplcte with two U2!lze halte'. Type Volte Volts Current Ohms BARGAN BOARDS V2 battery nlze JwjJder. Designed be used ab a. ideal all 27/A 12 12v v J73/A 17Al/A 700 All Components t E x door morae lractice buzz.er. 21/A 12T 12v 28M/A Component# boarde with Reailltors, useful Tran&ltoftJ- prox. Bize-2f" x G11P li". 12/A fly 6v MM/A 33M/A each boards wllh ReaLatora, galore for Capacitors the experimenter UMtu) Ex Transistors Computer a Dtaigned doer or mnree can code bo Used practice ax a huuer. fire alarm but is idril a* it at lewt least 4 traoaialore t ran8illton per hoard. board. Five boards board. 100, Appro*. iue «!" * G ' x 14", ' OUR PRCK Wp. PRCB-liOp. U.K. POSTAGE 15p f you construct CRESCENT RADO LTD. UNLESS OTHERWSE You should ROAD, STATED All mail to 11 MAYES ROAD. own _one. WOOD GREEN. GREEN, LONDON N22GTL 6TL Phone: _ CRESCENT V.A.T. Please add CATALOGUE 8% %to all Totals Callers Welcome at 15 Mayes Road & 13 South Mall. Mall, Edmonton N9. Price20p. 873

8 SPOT FREQ. OSC UNTS. Suitable for testing SPOT FREQ. OSC UNTS. Suitable for testing _ A.F. 4 & Vid Yid Amps Scopes. Scopes, Digital circs, Signal n- n jection etc. These give at:! a 1: 1 Square wave of 6v Pk Pk orz-svpk 2 Pk into 75 7S ohm iises4 uses 4 fransis transis inc Unijunction osc. Contained in all ali case size 4l;" x lr x H" fitted stard coax sk plug supplied, reqs supply of 9v DC. The following freq are available 100, SOOc/s, 5OOc/s, 1,5 54 & lokc. 10Kc. Pfice Price- 2 other freqs n in this range are available at 25p extra. Supplied with clrc, circ. HEAD & MKE SETS for use with 19 set new boxed Z. 2. U.H.F. W.M. absorbtlon type range 410 to 470 Mc/s direct calibration req 50v 150v Ht 4 & 6'3 6 3 to work, can be used with phones 3. METER UNT ZTO" scale 1 Ma FSD 3i' 3t" sq tront front scale 0 to 20 also as 1QO Ua OOUa meter in same case ex a/c CRT type 78P7A 7BP7A 7* 7" flat face Blue/Yell phosfor 6'3 6 3 heater okay for SSTV new 2. SCOPES American general purpose bench scopes 115v 5Dc/s, 50c/s, single beam, 3* 3" tube, Y amp 2c/s to 11 Mc/s at 50 Mill/V Mi/V per inch. Time 4 & voltage calibrators, with probes 4 & accs tested with copy of inst book. 40. LEDEX EX SWTS coils 12/24v DC as 7 contact banks, also dual actuators allowing clock or anticiock anticlock rotation new TELEPRNTERS Creed type 85R printing reperfora- reperfora tors good cond 12. H.T. TRANS 230v prla, pria, v 112Sv at 565 S6S Ma new 8-64,64 matching choke YAXLEY SWTS all new unused with ceramic wafers. wafers, 2p 5W 5w, 3p Sw, 3w, 4p 2w all 35p ea, ea. 3p 11w 3b 7Sp 15p ea. ea, 6p llw 11w 6b 4 & 12p 4w 6b 1 ea. larger type nst swts with pax wafers new unused 8p 2w 12w 8b 4 & 2p 23w 2b both ea. 7p 23w 7b ea. H.D. Tx type ceramic 2p 3w2b 4 pos new To. METER 500 Ua li H " dia scale 0 o to 5 on small panel with swts TRMMERS 2Qpf 20pf ceramic air spaced new 10 for 65p. VDCON CAMERA TUBES type P862 general purpose S Ma heater with data sheet tested 9-50,50 CRT type VCR ' 3 ' S" green phosfor, 4v heater, 11' -SKv 5Kv EHT, with base.mu base, metal shield 4connections &connections ex equip CONT METER No. 1 Geiger counter -1 1 to 10 Mill/ Rongtwith mains P.U. new boxed 4 & tested with carrying haversack HEADPHONE LEAD with high to low res trans, 5ft lead with stard jack plug new 70p. 70P. NEONS small wire ended type new 10 for 70p. 10p. TUN- TUN NG CONDS 50pf }'shaft i" 55p. Also 2 gang 25pf i " shaft 95p. RELAYS 12v 4p c/o sealed 75p 15p also 2p c/o mln type 40p. 4Op. SLCON DODES 200 PV at 8 amps 4 for 75p. 15p. COAX CABLE good quality 75 ohm 15 mts for HEAD & MKE SET No, No. 15 for use with 88/31 set as boom type mike ex equip 2, 2. PLUGS & SKS with cover & 4 cable clamp 25 way 55p, 55p. 18 way 35p. Also miniature types SO 50 way 1,36 way 15p. 75p. 24 way SOp. 50p. MANUALS. The following are Photostat copies R1155 A to N. N, R1475, 19 set, 62 set, R107, CT38, 13A, AR88D or LF, 1049 Mk. 1, all 2-42 ea, ea. CR100 CR1D '85, CT , 2' 20, CT52/84 1 '-32, R , R209 Mk MK 1 & ''65, S , '10, set 1-21, 1'21, 31 set 1-65, ' TF144G 1 f-21, ' 21,52 set 1 t-10, '10, HRO Rx Ux & 4 Octals Oetals /4 2'20, 2-20, CD711.. S CRCS only R3673, R220, CRT26, CRTZ6, PCR PGR 2 & 4 3, ARR-2, B44, all10p 70p ea Mk. 1, 2 or 3: 3." 1049 Mk 1 or 3a 88p ea. CT54 with P.u.. P.U,. 70p. R ' 10, others available others available. Above prices inc Ca" Carr VAT. SAE for list No. 11 or enquiry. Goods ex equipment unless stated otherwise. A. H. SUPPLES 57 MAN RD., RD SHEFFELD S9 5HL (0742) 874 QUAliTY-STEREO 9 ankiranitti SOUNl-.1 E OffER' SOLENT AUDO SYSTEM ssfmniw ALMOSl "f PRC. 5 w*0t TO StllAl =.JO~~~E N CABNET FORM.. down -~:~~~606b - 6!l Stereo Tuner Amplifier chassis with AM/FM radio cover. ing o.ib long medium short Stereo FM wavebs. Separate Base Treble controls. Power output 7 watts R.M.S. per channel (frequency response 25-20,00 Hz) Tape record playback faciirlies- facilities. Dimensions 18' 18" x 84' 8t" x 3i'. 3i-". The very v~ry latest BSR automatic record deck with cue pause control. Two matching elliptical speaker units- units. Order early limited stocks available cash price 49 49' Credit Sale 5-00 deposit 9 monthly payments of '75 (Total Credit price 56 56'75). 75). P. 4 & P. 2 2' Send 7 7'50 50 today. Chassis only available for cash at '00. Full 12 months Guarantee. CALLERS WELCOME. CALLERS WELCOME... Stereo headphones supplied with every complete order.1;j lti L :.E::-:W::..;:,:S:,.Aiif.... ij....i PW/2/ CHASE SDE SOUTHGATE ~ - MillONooN CONDON N14 5n 5Pl Tdtpherm: Tllephol\lS: ot-882-t644 CARBON SLDE POTENTOMETERS POTENTlOMETERS '. --"., '(tat /J oeooo Stereo Tuner Amplifier chassis with AM/FM radio cover- Stereo headphones supplied with every complete order. ^ Tl'Wir. mflh pw / 2 / 75 r 60mm Single Track including Black Knob SOp (inc. V.A.T.l, V.A.T,), 60mm Twin Track including Black Knob 60p (inc. V.A.T.l, V.A.T.), 60mm Quad Slide Potentiometers Potentiometers- Prices upon application. 1K, K, 5K, 10K, 25K, 50K, 100K, 500K ohms Log, Lin, Antilog. Metal Case. 3' 3-2db Matched Track. 15mV Nominal Noise (B.S. <B.S. 2122). Life Lite ExceeDs Exceeds 20,000 cycles. Fixing Holes 2 x M3 on 80mm Centres. RVLN RYLN NSTRUMENTS LTD Send cash with order to above address. Postage packing 15p per order. Trade enquiries invited. b\ 100 CHASE SDE SOUTHS At 7W 0 6Qmm Single Track including Black Knob 50p (inc. 80mm Centres. Designed, Manufactured Supplied by;- by: DOMAN DOUAK ROAD, CAMBERLEY, SURREY GUtS GUS 3DJ Send cash with order to above address. Postage

9 i MODEL C7202EN MO"" 0720'" MOOEl MODEL ~/~UDt"'~!'m~~ M, 20.00«c.p 20,000.p v. OC. DC. [;). '} U ao.ooccpvdc opv to.ooc o p.v. AC ir / / ' JK 115,000 S.OOC a opv py AC. r_^.7^r 1 o.p.v.. ' 0'. -, Mirror Scale. ' " V. DC ~~~ 1000 ' 2500 ~~o~5~ V.. ~~ DC. : ^^55 V OC. 6 E^! 120:600 12QOV. AC. 10 so coo QnfRM V. AC. DC Resistance flka^k CflP DC Fesiatance SOC 1200V. xl, AC. *10. xioo. xiooo fe-iml'i isoif eentrescale. feqjujlr :500,1000 DC Resistance x,. V. AC. DC Resistance x 10, x 100. x 1000 xio. x 10. v-ioooockj x l000 \30U (SOn centre scale) centrescale) 30uA Currant centre scalei Current 50u SOu A DC DC i 3/ 3 Current 30 6i}CoiA 30uA/ 600mA. -20 to f3db" + 225mAi250mA SistA 250mA PRCE P 80 P 30p 10 to OUR PRiCE 8.95 P8iH30P + db. OUR OURPRCE 6.95 PRCE C6.95 p^pto. P80P30p MOOELU4311Sub stard MODEL U4311 Substard FET VOM Multi'range Mulli range Voh-Ammeter Volt Ammeter ;5i~rr':. KAWODEN HM770B FET VDM nput impedance 19.» Sem-fv-iy Megohm*. Ranees;- OhrrVVolt 330 AC 0/.25/1/2.S/1Q/M/ 1000V DC. C/2,5/10 -V ^ Bl ~~~R~g{l':h~O ~, " " ~~ie' ~n~fh. 1 O/2SuA/2.5/25/ mm. t'j EC;; ma CC. O/300175OuA/ O/5k/SOk/500k/5 ~- : 1,5/3/7.5/15/ ma~e m ls~a~e "~;';~::li;;i",p:~0~~i;;ep~3:~~~p M~:7~':;::~'~::'E~~T~:;-;R:;-1 a \ 0/35uA/2.S/25/250 50,'250/lOCOV AC. - O/BkiStk/SOOk/S i 500 Magohrr s M OUR PRCE :%* B?iail p trace ~ ':~~~L H '... make no mistake High KAMDCEN tprvs. iiaity. 360 MULTMETER Jl-Ng5~~3"o'i,i1SOmV ' '51 AC ~~~~~~~\i DC loohohm/v 30175/150/ V DC.0750mV! AC loaehm.'v 'OkohmN j. 1 ) ' S' 'SO30011SOV TMK 200 ZOO MULTMETER MULTlMETER KT U«23 5" mirror scale AC. Automatic cut out devece. $upp- U4323 MULTMETER MUlTMETER MODEL MOOEl500 ov,rloadp",''';'- i.d compl e.w;th... '.. d,. manual Build yoursulf a B ' d f unit ~i~~~~~t':!i't with sudlc/l F ~ ,000 opv 500 with, ortdoid protect- V 30,000 opv with ~5n~,}~0i2~/ test certif,catllts. 0 muhlmoror qm~u~,'.;, m~~e':w ",;.Onod~\ md," \, rjn " " frlfb oz oscillator. illeloi. SuileMe Suitable. HR Overload ~i~e,:~m~r~~~*:.~. l000vdc. OUR PRCE 52.0 P&PSOp!vb 'o'".n...,recoi ' '..,'.. 0/0.S "'. =. > save money. fc»» genwel recmw Ww tion. Minor proieatscala. H [\- \ i- ^ ' S Z.5/10/1^250/ 1 ". SO/ V MODEL AF.l05 tuning. 100/250/5001 Current: Com piece hit with LgX^, ' tuning. Ranges: 0/0.5/2.5/10/25/ 0.5/2^/10/50/250/ 100/250/500/ VttWtfll J^JTVaf 50/250/1OOOV 1000V OC. 5/10/ --*".. 3 AC. VflMHBS C k 't' h -.", 500/1000V 0.5/2.5/10/50/2501. ' l000v DC. S 0Jm 'maa,o"sa.5/ pv mowemeot m~':'.e~ se~:le. ~ Wit. ". 2.5/10/15/250^00/1000V DC. ~~my2~ V AC. 0 ^.05/ g~~~jj8ff~~~' q^^e 0^^6/0^5/50/ Currant: r^^kv' «MOOEL AF.1D5 VOM SO.OCCopy. Mirror Resistanc~ $c~le _ Met~r movement 00.5 B'6 '5 50 SO '" SOOmA OC- DC. Resiaiancer Resistance : a/soua/s/so 1/10/100 ohms! b.~~t,~~;i;i~ O i ". >_~. ' ;~::~r~:;:;'a~v * 10. «x la. x 100, 100. «x 1,000. x , {SOH. AC. i5 o 0/50oA/5/50/ s-:<.' i i KKCl Res-stance: 0.1/ f2 A scale. 600md. (SOU. 8?t?o:7& 2A ~~~'?cf;"'egohms. DC. 1 ohms/ P*X^1.. protection. Meter K ~~W~~h:;'~s/ 300/6001 " mounted n J «2. SOti c«n «f e aeela} C/S0k/6 mtg/6g magohmt. T/O/KKMc mounted in Balttry ~5~;'~~~.CS~z~:~;601~)97x operaird, Slie: 160 x 9? * 1C/1 DOM ohms. ehms/ 0- QUR Can. paid?6ib: ls S;20to ed S' 180 ~~/ ~~~'~~riovdc "- bett«ria», cab,n.,. All f«u P""'. prodi 40mm, Supplied in c eying cne cam. OUR PRCE 13,95 C.rr.pald OecMt -20 to SOO-bOO. J-3.12.$0.'120f 1200V DC. 4Omm. Suppl;ed;n ca"y'nu c.., eom Cm 'or.bov '4~~ 80m::'~'lu:~:=: c~m~l:;. w;'h~ A. ~... '.'1iJ ' in»ctueiion» ~nas~~,::!~~~~:~~~~~d.~~~~0 fionge»:0 0.6 " 6 6 ' 30' JO ; pieta udih i«r (eeds. Cau lor above C1.75 0?dB. Baitaiv operated. S«*e: 18C x C;6;3O/i20/. pi... with test leads "'1 CQ $0mnl. Supplied complaie with, 300 _ ET 60/JOOmA,' _ :. 120/ 00,1200V D C. 0 6: OUR PRCE 7.70 PSPSOP test leads etc. O-KpAfi 6C0 12DOV DC. jstlt - jjjl v.--y^ii '20/600;'2OOV D.C.0!6:30, '20 OUR PRCE 7.70 P80P30p HOK VOl T.OHM. (17.50 P 80 P 40p ',2mA,mOPm /O,'o'oOK!!.. o ~, ~. 600/1Z00VA.C. JOOV A.C. Cui'BnC Current : , 0.6 6* H 750X VOLT-OHM^ OUR PRCE P&P<O 60*300 MllllAMETER. 60/600mA,R..;stance,0 'O, HOK730X ~.- TMKMOOEll17 FET MogDhm" 20'0 11d8. 'OOK1 " 0 M.g ohm,. Dedb.l" '30000opv Dve"1 ~35;j'''l2?jO~6::i?;~~ ;. electronc (12.50 P&P30p. - 20to +63db. Sile: 1'_ 0 12 Amp. ma." 0/1 OK," ^ & 60'600mA. R»»»sc*nce: HOK 730X MLAMETER, TOOK Meg ohms. Oedbel* -30,000opv. Over' 43 ranges: 0-0 J/OB/ v 1 1 TMK MODEL tufet m.-l Meg CmnOO Ohms. 20tO 17<J3. _W 35mm 20 to 63db. S"»o: 00 1 BO * load 90K1S0x lo~dprote~tion pro tec lion... (.. " ~~..., 300/600".200V DC.... Battery ~ 35mm 66:"30,60/300/600/ 30.60/ /600/1.200V 1.5/3/6/12/30/60/150/ OC. ' ELECTRONC.. ~~ '. 0-3/6/15/30/60/1201 " Meg mput, 26 OUR PRCE P 7.95 P&PMP. 1200V OC. 12/60' 0-3/5/15/30/60/120/ Baitacy operated. VOLTMETER OUR PRCE 11 Z.SO P6P30p. 1200V DC. 12/601. : ". :!.. 300/600/1,200V la,ve4 Y. ' ~Ns~M~Z. aopde~ite,. '..:O~~R~::..::..:...:;' /1200V AC. 300/600/1.200V :..;;.,..;P80;..P_3;.;.0;;..P_- 120/600/1200V AC. - ~ ~ ".~. : Q- JO/6QuA/ '., ~.t.. m'4'9r'~r,sc'7a~e60sm"em,.--,.. battery A '.S1311S1301' ~., AUOlOTfiONC Model ATMt 60/hA/ Current; 0-30/60vA/ AC. /S-.* ranges. 1! M-i Lerge. W, 4'i" 2S 1^ ^ * Teici LB3 TRANSSTOR TESTER AUDOTRONC Model ATMl 30mA/300mA.... (r~jr4~~3~;j~t:~e~. 4 '.. Topv»lue t mA/300mA. 1.5/3/15/30/160/3OO VBl, PNP/NPN. ico B. ^ g 330'0\'~~SO;C ~URC;RCEPPlied.." ~ ~ Opv Top SXXhtl value 1,000 irtulli' ^ 2K/Z00K/ O 3/300i</3/30Mohmv ma/s/12a. A»siHanc»; 0.3- US* 12000V it/ifilmm, DC. ^7 ^ if from Ooe-aira r^jl-r?r> 2K /200K t Decibels: to +17dB. Output; - a=800v p.p 3 95 :'!, mate'. opv m.t.,. pocket Renoei;- l=anges:- multi m'' F.. =... "it 2 Mag Ohm, Decibals: *1788, Output: V A MS AC. 1-d^i. nstiuciicm 9V Mi suppliad itry. il.x-vttw U v. lot Meg Ohm. 63dB e /6/15/30/S0/120/300V. 0/. S.. Accur. current A R P&P 20p 0/1 0/10/50/250/~OOO OnO/ToSf to «3d0. 0-3/6/16/30/60/120/300V. Aecur. 8-6oov P-P OUR PRiCE vouac.^oi. ' ~~= PRCE ov~!~vD~C. \.~oo,?pv :C~~~~~~ ": 2060~~e 0 'b ' 2010 OCcufumO-lmA/ OUR 7.5D eey 3* OC. 4* AC. Sansiiivity: DC DO~'c~~:;td~l~A/.: ::::. :...'!!. ~ BUilt n protection. Sile; x ~~':B. Supplied"::s~m;~~tee!ith leads looma. l00ma. nemience: Resistence: B : w j P&P 30p op. DC op* AC.4 mch 12niA. cunant fteslsiarce a,p aic meter. Built in praltcllon. 5«#: 57 * LB4 TRANSSTOR x instructions. Testos O/l&Ofc ohmt. f ' T";. 102 s 153mm. TESTER PNP or Ol5Okohm.. Declbeli: -10 to E.VjflN'. _.. ' ''.-~ U43Z4 U4324 MUlTlMETER P80P4Op P80P20p '"n,;"o".aud;o +?2dB.SUe90 Decibels: - 10 to ~ :.-'.' 1 "'::::::"=:'::"::':':':::~"':"::"'::::-t-=;:;::~:::::~~;-...:..:::.,.:::~ indication. +22dB. Size90x ic High Mmilivity, MULTMETER over- - - OUR PRCE p&p40p BOeTBmm, ll^.:' '-.' HighsenSitiVity,over.~. : OUR PRCE PaPjo. Tmv PN'P o. NPN BSfe H ni... TMKDOKLAB on two 1.5V 60 Complete x 28mm..! -. load otel:ted. ~ - TMK MODEL TW50K %" C batteries. Complete pi with t!.~ea~:' Wit. h ~6ar:.n8~/:jiD~r OUR PRCE X.1 C "~, >;. 1-, : 50kV AC. t.~~l.~i~;l~.'6& ~ P/loP 2(Jp i 0 R 0.,, 1,. 2'3 n Oges:,, '. -.". Buo,P,'.', ri ' J lo»d 20 Otomv. protected Hanon; V 00K LAS TESTER tndi^,-df^ fanjijicra. Operates Audio ^3^^ UJ test laedt. 0.6/1,2/5/12/30/ WO;UthR;np"R,ulcC'Eions OUR PRCEE3.25 PSP iso 60/120/600/1200V - J DC, 3/6/15/60/150/ M Ude. 50K/V DC M.CDOos,. es- batik-es. sca/a. Bux/f with imiructions Complata etc. RuKcjl rvp C3 3O0/B0O/9OOV AC. -;a" J 60V/V AC- short Current; DCVolu, 0.'251 opvdc.5kvac~. Cu".n" 0.06/0.6/ ' i. :~ {K f C7C Volts: 0.125/, x SenPintrv clrcui 1 QO.CCC chech. m 1 OUR PflJCE NH ^ 0.25'.2S Volt,; 0.S2.51 'C. :,..,"',... KAMOOEN AUDOTRON1C AUDOTRONC Mgdsl Model ATMS 6/60/600m A/3 A OC. R«0.25/1.25/2.6/6/10/ [ op. DC. Sh/V AC J 4.59 psp a>p Jawal moeamanl. 03/3/30/300mA/ ~~?:ir3'lll'3'~~fc, ~; -V^'.. '. 25/50/125/250/ DC ~~~~~ll~o~ol" l(:!.~gmj~~. iltraeiiiitv Jewel moyement ~ 3A Resistence: 1.5/3/5110/25/ /1OO0V DC. High quality cue aunc.;,,'ymoulded with edjwine moulded - 3 A AC. RnisienCe; 500/1000. AC Volts 10/50/250/100CV Vgl 1*: 0.5/2.5/ - VL-. >[- - " V-J KAMQDEN TT35 C~ /600 2S15OO 6hm9/O.5/5/BO/5O0h ohm,10.ssso500k ohmi/5 1.5/3/5/10/25/50/ AC. ohm,15 125/ cu".n' 'O'OOuA ;nu,umen o ( 1 ohms CaM with edjutlmeril edgwls>8 ~~..... Mahnu, Mohms. DecJhelj: Decibels: -10 lo to 12da, +12dB. Stfa 12S/250/SQO/ 500/1COCV 3/10/5 Or OC. 2 C-'J - TRANSSTOR TESTER Sile 10/100/2.S/10A. Resistence: reverse leak OhmSadi8.~i1';i~ 501 ~.' 16? * 98 «63mm. Supplied com^ DC current current 10/lOOuA/... '., 161 x 98 x 6Jmm. Supplied comp 25/5OuA/2.5/5J.l~/ ~~1:~~~~6'~0 ~:t:~p~a~i~~:e current 3O0/120aV ar ~c ~~ ~rr,roov AC. Ute with lest leeds,»<> ' diode 25/5<XrA/2.5/5/25/ 19/100/2.5/1 OA. Reinience: irdcument AC ~~ :~~r:::~r!s-:st leads, spare diode ~g~~~~~e : with cerrying hle. Sile: J( ope;.«/30/ instruclionj. 50/250/60CmA/5/ iwloh/oofc/o Mm/]00 Meg ohms. test to 10A. Resistance: Deeibefi: -10 to 4$<3a. Plaitu rate currant rwrarse latk ~~~t~~~ fac~~,'"of '. - _. {BOOOoswK ~=~vd~ijo 0-3 DO ~. ~ OUR PRCE 9.25 P&pmc loh/look/l OUR PRCE (9.25 P80P 30p l&"~~oo:~!.m~~o.o VroJ wiih eerrylng HenOJe. Siia: 190 a 172 Current. DC r^_^_ 10 Wag ohms. -20 to * '.5d8. o~rpillce 99mm. / cation AmpSe NPN. factor P/loP 30p ~:~;,:'~:': ~~i'," "" ua/doooma ~~3'l:ov.!;:ggo DC.."- r OURPRCE(12.50 P80PZOp.e 4" ReutUnee'. *10 8c 0435 MULTMETEH^^^ OUR PRCE PS; OUR PRCE P^pjop fcamislora. PNP.dmces. SCR's j "'U"..' _! k Supplied :=~ ~~t~~~td8 1 DO. 10 with to baliify 16d9... ~. ' ~o~!o~~. ~:::TEa ~!a~~~~c~~!~~eter ~~:~1rb~~:7~ leit ~r.~'ts leads V;:: date ZO.OOOopv. Ranges: ::t~ery ~~~~i~j8/l~v " i'h~~o~v, ~~":~!~:~nv::~~ads booklet. Siza: mm. 2.5/10/25/100/ ~~O?C. carrying hle. OUR PRCE 3.95 P.. P20p V -.. Sool'OOOV AC. OUR PRCE P 80 P 40p ~H'lO~~~gX.~~. :..: OSOuA''O'OO U4341 Multimeter MODEL TH12 1& ] buahlal Site; 121 x 73 x 2Smm. 76m 100/250/&QO/1000V V/2.6/10/25/ 1. X TB flilli,lllll3 /< H OUR PRCE 3.95 P6P20p DC. 260/500/1OODV 2^/10/25/100/ AC. BaA^Jll Currvnt; 50uA/1/5/ A A PJ MODEL TH2 ^ 25/1 OOmA/0.5/2.SA -V.B 600/1200V 12/30/60/120/300/ ~ii~~/l~:s i st.. mo/a'ojm1l'oaa,d,co'a Transistor Tester.... ~o=j~~~'sl9d:r~~ch ance: 0.3/3/30/300k ~f; 0~~~/~Ok/500k/ ~!:a'~~d'p~~'t~~:s.\ /10/ ohms Size' 205 x mm Sup- D"'~bel /1SO;'ooOV 0<:. 0/101 (i'!";' 'complete ncls, cr~odile lo "0 20,000 prouetion. &pv. Slide Ov»rT<j«d switch Q^Bm kcsph OC. D.5/2.5A 5/25/'OOm AC. Rtlilt- A/ ft- TH 1.5/3/8/12/30/50/150/ DC MoKimeni & ^ 300/600/1200V tveciot. S0/150/1O0CV oio.xizsnat DC. 0/10/ W^ ene«. ohms. 0.3^/30/300k 15/30i A/3/6/30/60.' AC. TraiMKlo, Tnl!r_ WWgw Sim: 205 * 110 x Sdmm. Sup- 150/S00m A/5/12A DC d8. Rang"'. 0.3'.516/ :.. 6CV»0/tOOCV 60uA/25/25OmA SO250'OOOV AC. AC. DC. 0/ 01 &* plied complaia with ieedt. ciocodila 2k/200fe/?M/20WOnms. Oveiioed ranges. 1B,700op*. ~.- clips ch""nd tieelaetykrvg...,"",.,;n. case ecadb. Hanges: piotccied. H - ea... OUR PRCE P80P 30p 30«a/150/300/900V OJ.'l.S/S/ M - " b"t~j~0~~ggf~3gr. 0/2k/30k/300k/3 esodb. ~~~~~=~ DJ~ohmL Meoohmi t-::0;.:u:..;r:..p~r~~c::e..: :;;8~ OUR PRCE ;.5=~P:..:80:..P.::3.;;:OP:;;' p»p3o a OUR PRCE OC.,:",,:,,:,=:,:,:-:-:===:P80::P::3::OP::-l KAMODEN Kitilireste,- Mllltitester 300/750V 1.5/7.5/30/150/ ~?i::~.~~.'t.rio.61 : '. OUR +OSOdURB'PRCE PRCE E5.S pspmp U4J12 MULTMETER U4312 MUl TMETER Model HT10084 MUl TMETER ~~,~r~~:oltl op. ~1~)!1r3~';'~~ AC. ~ P&P30p exremely iiulmment extremely sturdy Model HT10084 MULTMETER High tens livlv i,,, - t Curreni: AC. -Jb sturdy for Overload Ollerload protected. tester. Overload ZOC.OOC op* * 6/60/600inA 0.06/0.5/ ' Resistance: 0.c)6/ nstrument for ; shock HOKimXVOM ganetal elachictl rfiocfc proof proof circuits. circuits. k ~ P Ovarfeud protected./*- - 0^/2/3a/300mAAC. OC, W «M' ^. 9.5uA Mirror scale.... ~ -. ~- O.6/216/20/60/2OOk ohmsl2 0/0,3/ gene6~7elec:tjlcal ~~.~:, ~~~~ S:~~tiVity ~'-".' ~/3"3r:20JU~/.3 ' ~'. ;;.:'""0:':'.t.~. == '. Battery operated. SuP:rlied O,~ 7,5^7.5/30/ 3/1 ~hv U 5/301 _ 100kV P 't cha Ve.. '200V DC. 013 ' cw... ith. P.'.o... "'5e~2'.Snw 9Omsleelmc.arrying infl 2tffKK nitnjmant. ufw. 0/ 60/1SO/30Q/6 " MOV :g~1j~os?/;~{, DC & 7STV. 00/ L_ P./ v mirror Mater tcala.sensrtiv with 1 ly * wj' L «anff«.--0/.08/.3 Hirrpr wale. h^tv^-b - ill <L6/2/6/20/60/2(XMc ftebstance* 0.06/ ohmirt Mohms.. ~ Jl. 100hV. Po/arilv Chanya. Ja 3/30/120/500/ switch. swltch : Bangn: R~~rO.5/2. 0.6/2.5/ 51. ~ ~ -la 1200V OC. 0/3 fl wiih Baliery ope>erad. Supplied complete : ~2~6g/~~~l}200. ' OURSipRCE P&P30 5/25/100/500/ 0/0.3/1.5/7.5/30/ 3t /301 mmt - 1-/SO/250/500/1.000 >.Jl. i^-eo.q00/ easa.» : piobes. 115 leads * 2iS * 90mm. itaai c»rrvina ~ ~~t~/~~~/i.r::~~i~rr::. b! { 1.2mA/120mAt.' ".'"d".! 1000V 50/25 O/l000V DC. O/tOi 60/150/300/600/ Vglts DC.2.5/>0/50/ V SOQV ~1J~Jogf;~A/ AC. 0/300uA/ 760/1,000 Vu! it AC. AC. C/5uA/ A/» - - i. a PRCE 10,50 P&P ~20~00'kl~ 2~1':"2'0::"M:!,'-0~h~mi,. _~ g~2aa~h~~~ito 0 AC. O-SOuA/ 1.5/6/15/150/00/ DC '.S6/15'SO601 _. +63d8.012k2ookl - :'-.-~tt ~~O:~~~T~LRT~~~~~~ 250mA. 2 MegohmL 0-20h/. 6 OC, OOm 0/1.5/6/15/ A/1/1,5/6 A» 20a./2/20 resnra.-v** Me,, 0-20/ ohen* 7 f 600mA/12A 0/12A DC fr '-B, j DC eu'rent: 10/250uA/2.S/25/2SO 3dB. AC.-20ic 3/2«/JCOh; fl v^- ^ iv-rzll S100TR MULTMETER? *9? TRANSSTOR TESTER 60/150/6OOmA/ ma/10a. AC current: Q 10A Meg/200 Vegnhmj. OUR PRCE. 1.5/6A AC. O/200/3k/3Oic ohms. OC to 62dH. Operates from 2 * 1.5V OUR PRCE P&P 300 scale. idc.oooocv. Mirror _ 5.97 Kcuracy 1%. AC 1,5V Knlla adge batteries. Site; 180 * 13«* 79mm. P'OtCCl'On. Overload 1 :o~~:=.v ~i~;~ra;al~.5~':p~~ft~ =~~ P&P 40p PftP 30p pomter, mi f or tea]*. Complele wi<h sensitivity. ~;; ~ ~gg~go~ ~~~JO ~~~ sturdy melal cerrylog caw. leads OUR PRCE psppoo U4317 MULTMETER 0.6/3/12/30/120' 0/0.12/ ^, ml mtrueticfli. 1 High sturdy metal carrying case, leads ~':,s~rl~t=:!~!~ -olrumanl nstrumanl teniitrv'lv lor lidd fihd ~~~k. t l vt J ~- = ;. :: * ' 1 6CCV OC. 0/6/30/ v d^2?- gb1~~~f~!2bc ~~l~gl::6.~.. '. instructions. M,ooO.ooooELopAvS. 1 ODD. "_"'_~. ed~ pointer, ~ ::.L..:~Y. 0/10k/l Megl MODEL P"a OUR PRCE 1Q.2S (10.25 P&psop MODEL fls.1000 VOK end tboieioy weih. P80P50p M.OOOop., J" 1 Knife 96rrm. edge po<nie>, L C/12/600UA/12/ 120/6COV AC. fvs W ' SOCmA'-E/ZA 86mm. tnirror m'''o,oe''e. scale,,- Pm C/10k/1 '00 M"". Meg/ DC 20,000 a pv OC. 1 _ _ 1 Mirror scale. protection.f -20 to +5OdB MltrnrxcaVi opv AC- a amm ~~lmcj~e~ VOLT 8<,' C te& V0LT BulEt'in meter Overload proteotioni :ru~~~'~~i~n~';jr3 / ~.~?~~/l':rsxf0100/250 ~ r~~;;~t ;r~ts~rmeasuresapha. 6/3/12/30/120/ For measuring AC «oll- protection.of3/. jft Henges: 0.5/2.5/10/25/50/100/250/500/1000 loomv/ zo^sorfs Ptg ; For measuring AC volt ~g~oooe ~~.5/ h~t~~!! 'a~'r:~d!~ instructions, 6O0V 600V OC. DC. 3/30/»«cur/ant mllhout WML 12/60/120/300/! - A V DC. C.5/2.5/10/25/50/1 CO,'250/ Tiarintor MFD / V V DC. breeking 300/600V $:~~~i~~!i::~~~~s:: circuit. AC. Currant; HAngn: JWM. 600/1200V 0/6'30/120/300/ DC. 1 R 500/1 OOOV AC. Current: 5CuA/0.5/ tester meaures AJphe. Beta ~~~:j;~,026~~{)/ L fa B 1 ~~~f:?~r,0jfs5c?t~~':'~~/~~ AC. /5/tO/5O/250m A/1 isa OC. 0.25/ batteries CO. *nd Ccmpicie 'eeds. with insirwctiorts. OUR P&P 25p 50/600 ia/60/ 5O/ 600pA/601 Tl 10/25/1 tj0/250/5ooa, BE 600V AC.0/1 Op A/ 0.5/1/6/10'50/Z50mA/1/SA Pas 10/2S/100/250/SOOA. 600mA. Accuracy 4VSite283 «W :~:ri/ 6.6a.300ma/ :O~!~tOJA i stenca: ~i3t:.;k o~;!:.'g~~~~:~:+~~~ G.5/10/100/200 ohmvl/3.' OUB PRCE PSP?6O 6OOmA. Q/OOK 10t100K/1 Mag,-10 Megt10 Mac Meg Ohm. 94 «38mm. Campleif H 11 '- 20to '. AftdB. with 46dB. end ~~:57:c!~~:,: fuses. carrying caw, laaos WL 200K/2M/ Amp. 0'2Ki 30/30Clrohnn.rW-5eli: -5'o*t9d8 Ohni. i~~";~ifi~~. JO to Meg Battery opereied. Siae: 210 «115 a ALL PRCES 11 90mm :'~~;~~:!?d; n~~"~;~~~:'.':;mx prale vnth Suppl.id leads. in carry,ng caw com- EXCLUDE VAT OUR PRCE raflcp. P&PJOp. OUR PRCE PB^OP P80P30p OUR PRCE 17, PbPJOp. P&PJOp. OUR PRCE PS^o P&P40p Also see following pages ~~~.-.- OC ~~,~ii:-~~~~ :::::f:m::, '",.. ~i~~:#:;; fij 875

10 SN SNCLAR DM2 DGTAL TEZZ SNE SOUAREWAVE TRTON PORTABLE PORTABU TEl0Zl Stefeo listening SPECAL BARGAN!!!l TE1D21 swito Liltening Station For b... nemg _ - -. MUlTMETER MULTMETER AUDO GENERATOR 8 TRACK CARTRDGE f 0# STEREOSOUNO.nd!pinselecHon ~- - PLAYER WTH MW/LW STEREOSOUND nd ^kh M<KliOn L Matched SPEAKERS pili, ~fi of ~;~~iolc,:.7 loudim»v*rt A ~. ~~ i ~1 RADO r~ - stereo itorto pair of,. bookshelf with Bdd»tior>i< * speakers. Detuxe ~~~i~~~~ steflta " \J ~,..a., ' " Nl Squ.rv 1.'-A, t A peakart. bookthalf 4wr>v. plays teak veneered cp. to 30 _ _, WillplayB il'wbbaflg ji>t4^vt>>t*rad Daiu"» fsaais""" SWllchlng. trackst f!re o finish. Size: nvltching. Two ' VHt. Output stereo ilin 368 x 229 x fl'tn conlrols, speakers on-off slide cartridge switch. 190mm. B iwittft. conlrol*, stet'eo»i headphone hdphort«ipcihait erv-ou socket. socval did* ohms. Will meafurfl AC artff DC vpu». AC impadsnce monaurally. 8 watts RMS. 16 OUR p.. p 150 od DCcu'rart.flndr^iiiiBnrMna 5000 Ofim». s 'j p - 200/750V n 190mm, 8 ohrm. OUH PRCE 2.25 w Chann",1 total of TOrart^o*. f ho laiqptiqhi AC stdcctor C:~~t~:k~ith AUDOTRONC omitiiog diodo display will roml till guannlaffd, dptrai'dn. with Supplied initrwclion twjnd mangitf naw r'octor wjtiijmjk, watti RMs. ^ ig rit'i rf'-tr.'--- AUDlOTRONlO switch. Covers Din lead. to >990 autontntlcnlly indicate UmJj. mmodiiirn Cowers edum end long wave wewe^^^^^^ LOW NOSE CASSETTES 2S do'o'hv ndicatiou of poait>vo iind OUR PRCE 24,95 wtsr. bs. h^nds TYPE lone controls. ego piagaiivaovo'idad it also piouiditd. Earphono Earphorut Volume socket. jnevei. Batte Bailtrry tone confolsi ry Mains Mams OUR R PRCE 1 E 12.95PAiRFftPSQu CSO ft [2.24 The (nairumant ii futfij vifh a ARE 300 AF/Hf SGNAL operat,on oporation C90 CUO CT20 2, , combined banchtt canyinn SOChott hlo at p 5' > 3p ««':H 10 Qvpf Pog, f. t t» provided tor thecannection of an All GENERATOR ramhtorimid OUR PHCE P5 psoo fm TUNER CHASSS MP7 MXER PREAMPlFER MXER-PREflMPLFER oitarnal power supply. rompaet fully ^t 6 5 Microphone Mtr.rophoot ~, R AMGES; wjv«flhr to^tto S FA4 REVERBERATON hil*. lonoitck i~~iv~d::~i~~h input» aach with qz::::; ^1 DC VOLTS v.lo.oov.twoov. khz, AFtouar* J AMPLFER ^, tuner. oinlily tndwchtffun M RBOO"*) controb en.bllng ~ AC VOLTS: 1 v.lov.locv. 1000v w*v» 18Kt 0 100V KX Sell contained. F^. 1 mm only 153 Size «LAreutm XS. conlioli anabllno v 4i i.- m ixing DC CUPHEVT; JmA.On.A. Ht. Output S^uara/ tranmiorrted. buicv opeaied- 'w V -- ro \ f 3 10> F «itagci. 63mm complete ^" fecilitim. Battery operated. Sin: 235 >0<Jm A. 1000mA PP r^htiin. ;J~;7 l?7 ; x7~:v6~~~s~~~~~~:. 'STtm. Sotiarv npiii»t op«mi«d. Mi<» Sur: 3 * ~: 3n*V 735 AC riiqrt.mt imaoma TOnviHr. RF toovht Output m 'ftp' micophnnr^iifar Simply plu) in etc. nuiput _' n Hiicrlminalof. Double tuned 50V:? 3itiV t*(*i ohm*. Pho«\o. M»o, JtmV SOl( ; Phono Ce""mic. lonmv 1 'DOmA.OOOr-tA. vivit ilrpdi nmpliliar. of taverbchhon Vniumconrrftt. (nnifol B-mi Operate* Ample milrul in '-"d mn*f»mplllie»*. 4mV 50V. Phorpo C-'amV; to" V ' M"l!. Output l50mv look. RESSTAVCf tfc.tcv.flok.ldhov watrhii cabinet, 104 -»7 w 108mm. 1O0MM,, r»n Ready pv b.thery, hud, -iviy Ciwar* for PH-. irv, FanTaatic value fm mnurv. M-0. Orrn-O?50^V 100V. OUR PRCE 8.97 P~P200 p^njnp OUR PRCE p&psop OUfl PRJCE P&Psop OURPRCE E7.50 wsot, OUR PRCE 8.35 PJ.PJOP Sierao Muliipla> Apaptor C5 SSeitra SWR METER Model SWR3 WAlKE WALKE TAlKES TALKES J LH02S STEREO HEADPHONES AUDlOTRONlO AHA01 Miorty SWR malar for SKYFON SKVFONNV7 NV7 AD8 raraminc fniann* align- Super lowcott cost ^ phonei Light weighl with nadded head- if# Model A1018 Slereo All tilrcon, Hudphonr Amplilier ^ mam, witfi built-in fiald eer transmitter. stranfl"*!~,~~~~~gh ~:. l00mw 6%. mpadanca ntota*. Accuracy 57' ndie- 4jA receivers. 100MW ^ 20-20,000Ma. pl«et, 4/16 phmt -f \ 3 FM TUNER buzzer 3~~is% ;!i!;;d " \' ~ tor looua DC. full.a with call burre' *' Complete wilh 6' YMO^m-, &' 6 ramiitdrhigh amplifier uparlead end plug. 3 F «iage«, heuo c^amic"')(] C -- C> J off volume duuble ' _.. - ~. : Kala 5 laclian collapsibfa V duuwe digcriminator. ~-. antaniu.sce 145i 50> fc ronitot control. 7tritnsistors.. For amplifi.!rs. Covers 60mm. " Telescopic 7TtMntl4ior*. rnd rod < JF OUR PRCE PS-fOOp dlnrirninaloi. tuned l r_ * TJ nputi wrlh F<>r 8S- 108MHl. 9V antenna. OUfl PRCE M^S P&P antenna, MK,. use with most Powered jmpltfu"*. by SV battery. Coven eparaie twin iltreo h*erfphgn«uulputi 1350 P&P3Op OUR PRCE HD2SSTERE0 HEADPHONES OUR PRCE p&p 3f>p channel. Operalei volume conlroli from 9V lor ballrry. each 3tereo multiplex adapter C5. ~5 utr,. par PAR P 5P 50p, ^ JUl Wpnderlul axciheni value "Sy olorea multiple* adjplor 9 95 nxt'e. OUTPUT; NPUTS: SmV SOmV per MmV. channel. CS C5 PULSE DSCllOSCOPE For dipplay of OSCillOSCOPE putted. i ' --, NOT LCENSAHLE OURPRCE 8.50 PA-pjou ELECTRONC CAlCULA :.: prftodu: ~~!2cO~:~sed wave i "^Ti MTH" combined. Adiuitforms formt in alhcuomc etectronic EMyfoJKk* MODEL MC100 SNE SQUARE mpedence able hrad b. 6 ohmt, fjrwm HGH QUALTY circuits. Bwtihvidth: VERT. B.ndwichh: 10MH*. AMP.gB» 1OMHz.. HBMH WAVE AUDO Complete with JDS^LM. '-1'-. ~... :!!.:.. CQNSTRUC7 ' DN S*mit(»iry WE ARE APPONTED Sensitivity.t 100kHz VRMS/mm; ai loovhi p. em -», VRMS/mm: STOt:KSTS HOfl. HOR. AMP. S ; mm ' ' mamu ^^^atoh lead plug. M MM y/f are appointed Bwidth: 42 & width; SOOicHz. 500kHz. \ Z m R-"U(19 OUR PRC6f2,25 PP O00Ht Sma -j STOCKSTS Oxford Street. AT «Z& W 'OO.000 Hr Square Wave \ _... 4iiiii.;,.,~:"- Santilnnly...,./J 257To11enhal11Court. Sensitivity ay ay lookht Wave fl MaSyuareWa^ 2S7Toitenham Court Road. 100kHz VRMS/mm: Oulput Square wa..-e 10v 10 TE ~ ~_ ~ VRMS/mm. D 3-2S Tjt-S Outpui Sine or Sguaiewawe 1t>w P to P E Lisle 152. PMKal Pr.., triggered sweep SiH 180 x l gomm Opera lon Low cost With exc ~."""''':'''':;;~~/ c:.. ' 311 [dgware Road. CROYDON,~ 1-3OOOusee. > - -TOOOuJe*. iriggaiad Ftom iweap Free runninfl runn;n; Sire 10D. 90 «SOmrn Ooerahon Lrnv co»t wilh Stereo f»c- HEADPHONES , 240v. A.C..nl..",on... Fo. m ~ T'/ kh* khz in in rtina nine rangai,,.. nges. CallbrJOf Calibrator ntpi 2J0'240w AC elleni t«ioonve. foam 311 Lnie EUuwnf.f Street. Ro*d CROVDON Fleet Street. BRMNGHAM p ip~ PRCE P&P SOp,.ubber earc.ups. Adjust LECESTER 220 :ilble» 360 1C 360 * x <l30mm, 43Omm V 11S-2JOV AC. OUR PfllCE pah sop Wo headb. 8 AC. B ohmt CCCSTR NORTHAMPTON KNGSTON ohms carry tremendolls range SOUTHEND TUN8RDGE WEllS mptdence. OUR PRCE c^r.p,.d Cm. po;d POWER RHEOSTATS 'fwnnve npedence. response 7EMr-l6kMr Frequency We cftrry a treiuondouwanpo of SOUTHfeNO TUNBRDGfc Y/LLS 25Hz-18kHz. desk calcula. WOLVERHAMPTON branches. or High Complete wnh tors hom little C.90 by ~?::.~,;~~~,~;~ATS~ quallly ceramic.. ~ Complele with cable < both pocket nnd drvk cnlculn- WOVERHAMPTON if stereo OWing l a dmuanrl ' is kits are complete with compr. RUSSAN 0116 Double Beam COnitrvclipn. Wi«m. / ' -^V nareo lack plug. tort liomaslitiroat f8.9q bv Mail Order. bronchbs. nr Owing 10 the dvmanil <1 n not All kin Ate coibpltle wilh compr# logi i~;,!~b~d~ec.wi~ {.~. ' P&P 30p possble include thern is hensive easy follow instructions 0SC1LLDSC0PE OSCillOSCOPE viireout embedded vitreous enamel. in l_v/ ['rl. { Wr Sil OURPRCE 280 possibta to nclude thmu in th««henilve eayy to fohowintlrueliam advertisement. send for covered 65 MHl MHz tmt pns b. Heavy b. duly duty brush S5f ' jsv dvo'tiaenicnt. SDH8V MONO/STEREO l<l t es \ list or call to any Post lsp kit. Separata Sep.rate Y1 V 1 *r*j.nd Y2 wiper, Y2... Continuous amp'fmn. amplifiers. Ractang- Rectang.."l titino. Conlinuout rating. ul»r ~!!?epc~~~~~ r t-;;;...;;...; :~~g. ~~:~;.~ ~'.~. ~~.'. '~ ~.'.: : g ~~ ular 5" 5" * lc d" 4" CRT. w Q SDHBU MQNOFSTEREO loirett pneu list so Or aend call into lor any our tovored by full guarantee. Poji Packing 15p per kif. SiiW. hal.ltelni. gt-tfttnnn Ui.liv HEADPHONES a AP20 Mu"" Rmplmy...^,... C5 6' CRT. CaUbntad UifuefFd.BBBP ^ B Hulk ~~1~~:~~ quantumi ifti~~;~:;':~~~mete avaiubta., shafts. ctjannel. ohms rnaeo ~ibr~tr~n!'~~ from aiutec. _ M each Volume channtl. contioi 4/16 for oh mi 4^ MNATURE MNATURE ORGAN AF25M««er. ORGAN A :~~~ f 3(1 Miiiii» i«;^mplifii ~'~:',\t~.;:f,~r;~~:~~,~ ; ~.r, i, ::... C3 ~:!~ 20 " to to 100 ~ milh-sac/cm. milli-sec/cm. V 25 WATT > !! >00 s/»o 1000 unprdmcr. F.aa ;~:::'-:2o~~~r8;H~. ~MUSC MASTER AMl 00 :~gg~oi ;\~~ :~~~"l : '~~~~. ~~ ~.~~... ~~ ~~ Free lime ohms.. 1 P&P lop haw running Mhx-t time MHt. kjj j ad. f 2500ofinti. fl.15 pg.p 0(J leipont# 70Hi-BkHi. F/cguency LH! MUSC MASTER AM1D0 AFan Af35 O.tlSmiC. Emull" amithlrrr CJ-C' Compliti ;:i!;~~::dw;~~ with tofi. :a~f: P U9. ^.tntidifiel f>f f4»^ rl~<~t~~;:~ Af310 '1 Muno A.nl l hlu~, f 7 Built-in ~~, ;~t.~tl~-;~~z. CaJibrslor time '50, Calibrator hate.nd ampliiuda -i ija amplitude Calibralor, 50 WATT foiled lead jack d'uq. Calibrator. 1.. P&P 30p. il~~'~~~'~\~ ~\~~~~~~:n::~;~:t:~ s;~ ; ". : ~~ ~~ Supplied cumplata comple.e with with all all tccfa&in ohms. OUR PRCE 4.97 t MCQMulfVliirfltur. A '310 2 h'«mc* Amphtml T7ia > *>5 accessorih.:. sr.nu. M191 lop vu Met!!'... [5)1.nd nitruglion instruction manual. nlanual P&P top M Ml30? S 1 VD TmhiiMoi Meier H-itcr <" Jl J' OUR PRCE c-.wid 1 Can. po;d loo DQ WATT 1/6 115 '10,25 10/ /500 '.0;250;500 BHOOl HEADSET Boom '. ~. Till S ros trt~ ~~~~~ MS?Siir«*o 2500 ~~i~os~.:~:r~~'~~~~c ~:~;~. (( ~ ~.~ 2500 ohm* Lf balancb miric'.. f>9> ohms. Microphone ~ ATS 380 f!j An Qii.«dranhnni«A"lom.trlc cim>l fc light " 9h l cunlifil druicr. f cont'o f «? t: J S!J M '1 d... illgivr. hourllo of cnlo Ylncnl P&P MODel TE15 fo~~~~:~ e,,1, to all the fanuly Be.. utilully : ~~g :~O~.:~ ~:: ~: c\;-:,~~ct unll. r ) MODEL TE prp 15^ A t>h GRD DP METER rt^rt A150 TDO pi)aril tonvv «c" tn.k \v,.ich light umi. C "i SPECAL PURCHASE :~:~~i.. t:~n~~~t~:t er;;~ Khl:ey l~,o~: ~:.~~'~~ :~~ AT;!i0l2~200~1!1~~;t~~:~t~;'1. :!J TranWttoriiad, Tr.nsistoriNKf. Opar- Oper LlMT O QUANTTY! ATbO rfimmiu 2?0flvV.iu>cd mac ronlr<d....ijm L'i tes as Grid Dip. Oiclllilar. (n it Grid Otcilliltor. Absorb. Dip, Absorbtion WNe Me.er OKillating hfaiar Bass Speakers j ) < /) - T.nnoy Z"DR/8 H::;h~~c~ iolpede'nc~ 16 ohms. Mic. interl~::~l~n~~~:~?:~~rl~~:~ f~~:~ AT~iont;.~:.:~',','~f~,~~~~~~ rlimmi-r.pnndcunltol ~ir ol!"~~ Ch " ~~ tlonvvn'b rophona impedence 200 ohms. on oft swit ch. vlhrolto ~w1ch. ATG~ ch;mnr.1 lghl contrul. i f> S] O::illating D*i«cto'. j"v- Detector. r ATG5 TO 3 1 rhrfiiupt chtiiuirl light light conl'ii).. comrul. f "1*7 'h ii" Fmquaney rang«utf 8 ohms. 30 w.n. OUR PRCE 5.95 P&P lop earphone SOCk:~ ~~~ c:~~: ~:;:: GU33U ~~~~~~~:;~"~:!'tll~;:~~. ~.... ~~ ~; ddofchz-zaomkr ~:"H~~8OMHl nrci Tirmnlouiui..C* 1" He.vy dut.,. de.. 1 n in Sill coils. 500uA tof H Fi P.A. HANMEX 3075 OUR PRCE 7.95 P\P sop ~~~~ ~~ ::.~~:!~~',:~1. ~ :: '... ~~ matn. ii* eoilt. ;',', me.er. 9V 9V bat'nv SOQuA battery ^jl\jl ee HANtMEX HRC3Q75 HFBS DrMif ih'imtni.. CJK' HF FM KJllWiiHi.-r.?l GfOUp Operation. operltion. Size: OUR PRCE CASSm~ BNATONE 100 ~~m 6~: ':~:'''FM; ; ;;;~'. ~ ;::;; 180 c x SO 80 x S>rB: 40mm. 1C 4Omm. Covers. > HFJJO Opcn")' HF3 10 / J2~"1 f ' ' ~. '. P80P 50p. P&P 30p M FM t!dhun Rn d t:::.fi!;~~... "'""-"'"!~ 4!.. A,vlol,'va~~i,v... tic-j """''''''' """""",,,,, u ~- CASSEHE RADO HF310FM 75 f M inf 1'iuirr. E 3 '"H Cnven BNAT0NE DGTAL CLOCK MF32b Deluxe liiiini ruwr... finj. f?»> H OUR PRCE pspjob... ~ for \'! w.th... AF310 [ 1.' ~K TRANSSTORSED l.c.r. AUDOTRONC le-02a ban;'~~~:d.. Rlit 1 Medium GP3 Mf Sli-'di Di-cmk-r li'it-iimolifipr ihf3t0'32u> F "'b'- l argeciear Q Q!i C"cult hn.ud..... fi$j'~~.. (! \) U/ TflflNSSTORSEO LCR, A.C. AUDlOTRflNC LE-102A bondf.slidei Large clnar BB.'B MEASUfllNG BRDGE NTERCOM nunshcx volume Ond ' ;~~::~~;l~l~o:tes lor JW GP3V? lor um: 1V411 2 ' AF3tO 77 1«:._. v ~~~~6 ~:; ::;:: ~~ ;,.:;';~rn. ;;... r ~ ~ ~~ Anewpanabla ~Oa~~:r~n~~:~ s one coulrolb. l houie, nunulb*. r,p3m Curmi hoard..,... f ''' W HF3B0wvhf Curmt bo.un - Jt Battery Mnm* 'V?TfHlUUfJ second* second... XF.TOS 4M»Hiil anijjlt(i«r Cii n." HFJ95 hro,ulh.ln",h~ ".,""". [ 2 1 U J brldga DHwina oporatlon. Will record... A A.C C.240VopL-r.t <on NT10. opllotion NT ~~g~ SliAiihinil tunailfwnii :~~19~c~ K»*v<*i.u>'r,4. ~~c ~.\~~ ~ v«typl*,«mii j hi.~~~~~'~ V U. n cellan/ar(je diroci direct from mdloor rildio or ihrgugh hrough built huilt Si/n Silf~ app'o* approx «i 6!. > 3 r: 3; :, ~ mchot "'chp.s. NTJUO Slat""!>..,, g. suupv. (1:t lto LJ-o W 'A O,U «i "CCuracv coat. Retisi.ince- *1 Vi" incoudanter colldftnser nurrophdng microphone, Com. fjt3l>0 fllvia. QV,..... * Corn. 4 PP. P 501) NTJ10 Pow"!, $PV Q g.'" : cost. Resistance plet" hatteries. e;trphorol!. 0, V 0 c:.11 2 amp s f~ rang ranges Of : Ot plcirt with bnitnnes. nurphonr. OURPRCE E4.50pr.PsD,, NT310 SiatrJnvO u ivipplv H-'Pv 0 1 CasS.HtA. NT305 Voll.tlJe r.nnverl p., f ~ 60t ohm-l ohm l' megohm megohm 1 11"" - mluet And CASBUltn. P 7.iavn 'ownr C Smuilv.tT2.ini i«740 V AC rvi-e SNCLAR C2 NTJOb Vuljagi-couvormr.. fia* nduc t ance; : 6 ranges* : 1 ' mlcohenrv-l>1 microhenry l" Beautifullymade i in PRCE 24'JO p & p 50" '[' " N.. T~~:. ~~t~'\~ olt:~'og,~~~.. AC (11 1)" hnnrioa hp-nries 1 2\ Cepaeiiy;!. 2 '~ Capacity : 66 ranoct- ^ euilfullv made mithrd in r"nlles ' two two nnn tonft ivpry ivory bulf. buff. the the E-102A LE ' 02A : OUR PRCEC24-30 pe,p so,. NTEGRATED is lopf.' r --> Am,,,,,, ElectlonlCS bv Jo"v K... 10pf llomtd.lll0 mid t 2'. ~ 2".. Turni Turns Ratio RMlo : use'ul inthehomc.offit:eorshop 6 SPECAL ~'\' J f ;. ~ pru'e \~ ofla l lor."'.. t ll,l. rangm. ranges : 1:1 1 : ' tl : l. uiefut in the home, or (ir.< or Bhop ' is s uitabl p. for usp. as bahy Bridge SYSTEM complete with r.o ver ~ 11", \U hlr.c ho11 h.\'c )'''' Bridge Voltage Voltage Ot a t l.ooocot 1.000cps. Opcr^- ndis siiitablp far use es nehy SPECAl OFFER! CONVERT YOUR CRCUT., ; C ' Amsicttf E Opera. alarm. alarm. Wall Wall or or dpih desk moummp STEREO SVSTEM AMPLFER ' «*pinlrc<inlml Electronics book for hy the jomv.m.-il.ur kh. mou t1 tmg compl.,. w,lh. ' tad rinted "ir"'." ~.. clpals to.ulv,tllced ell'ctro," c l!!'ch,"q ted from from 39 volt volt baiteiy. banery mrciamicro 57mm speaker micqives C(l;H 2, [040 P amp amp memr meter indicalmn, indlcat.on. Sfto S ize a 57min tpeahci nilgu>vei clnar 7-10 SOUND a--, prinlud circuit c<p*l«eoveiv thi" Mrhirel frpni mvi< ikui 7 ~ ~ x weycammumcaiinn way communication with on on olt off [16 ~ ~--~ mounting board. 1\( 1 Cm"",.,,, n AE 10 lisred...,,,,,", below.... bo;,," "" 5- x 2 ~ PRCE \lolumecontrol on ",.ster 3 ' N" V T OUR PRCt 2500 P^P aon And unn. uolumccont'cl00 Oporoins 00 9V hntt m.itier FOR UNDER flfi.fflqe K2 mounung board on. fn advuticetl eiectinme twihituj AP Ciii»» (l^f.- io A 10 hstoclberitw, wilh CirCuU br*ud lor Appro* OURPRCE 1.50 P&P, OUR PRCE 0.30 N..vaii -=::.:...:...::..:::::...:~!!!::!:!:~~ 60'f ~~;~ lead '~:derahls on 9V bat! Approx. P,,"P. nip "" ~ VAT TE-20a RF SGNAL '> iwrv SNCLAR Pioject 80 Modules PKP V'.W jiluv VAt Z40,",(lW'" Al) P & P!:' ~E 1 100",W lulput Slage:.. f 1 S5 GENERATOR TE ZOD RF SGNAL J ' 1-0-=U;;,R.;P.:.:R.:.:C:..:E:...: :..:3~.9::5=---.:..p::.&.;.p=:...j OUR PRCE 3.95 rtraor /ephma-n (Tt: :v.r~ ' <'(0Power Z60'owc.Am... Amp. Amn FT ra 4S Sti Ad loy-olt M 1 rt.igr: l Sb P&P!.p AE21'.,.11llll fl!!r. t 132 SH~ Aocuraio.. w 80 P,e A,,'!) r 6 P 15011,l 3 u.."... " lctllvl u!> Accurate wuv ","ch! lanqe range M.1 ^1. ( gnal gen«<«tor j. PS200 Reflated POWER bie'-osohrraiun fum AtJ A 2 'ib amii'ihcr... 1 a? AC,vo:fille.Um! P&P!iD AE4 Flashl!r [ 1 26 signal 9"ntl'~tor J. ~eb~hed POWER.,;;;;;;,;;. ~ ff.. 01 GOOOWN "_ fmtune. stilte. Variable.. CHANNel CONVERTER i pilir :..~r:.g61:::n~:' 500 ~... e. output 5 20V DC ~... o f AD15 10 watt S hookshell ~!rr:~~;";bral" ~ ~. - i> up 10 2 A-mp nde ' "',... & P3oP~D AE5 Astablelllultlv,bral0r... f1 14 coverviq 120 XHj 60n \ 1 gi A SUPPLY UNT»chis«vo o'lc of GOODWN 4- Sr,.t!o Der.ode' P eo P!>p A E6 Mo " o~ ' ahh: l11ulh vlh.,llo' [ 1 11 MRranhbt w Solid flat*. Viuijblr. CHAMNEl CO-W(RTCR «nda p^.r PZ!>Po... cr$upoly PPlnp AE7RCgc"ir.ltlJr... ['OS Onecdy eadbrataa -T. - e> rxiipui 6-70V OC - nl AO! 5 10 watt 8 ohm haokaunll Sir.eo HZSPower O^rodv fl394 e a e isd AEfl U.Hi- rturii'... 2 UV SupuJv resh reeiiii AG5 FlJthet f 74 PZ6.., SUJplv p&p)np AE8Bi~\',lte'... [1.O!> Va/iaWe R F ^ up to? Amp. fnde x. p'.j#! slj c ~ker5 enah":s YOU to '''ldd 40 Pl 8Pnw",SulltJ'V P& PJO "\ :g Tu:hl...,lll:... f 105 altanuala'nudin attenuator tudiu oulput. output. *1(1 Xt,,1 OCS*! mnniio/ pendimi moterr 10 tp'.mkere cnahlui yon to Vdd <0 HZB Pow,( SJDBV r^ss- PAPloe AF6 Avuhir uuilh vihrauh T k socket ~e~~i~~: roliogit^nd :~~~~ t:n~ 1 ^ ~~ ~;' 1 sound to your r-vistmg system p/i 'Owf Supulv fb9> fsfli R'iPMy eiaioa At Mmimi.slilc <niili«vihr^im H AE8 7 RC gchiv.»ior f i 01 i! ~~::~::C~~ ; ~~r Sl~,::,~!:il~~rl~,:~lt~~:, 1 'o':,'c'orme. nr Pll P.\ r ;Op 10 1d!' 1 OS C2(jS t'~.coa!1l11 kit (7.9!. P& p ;~ lor fnr call& «lion celib,auoro ' 74nv 240V ac current. Output 11 C 2120i2Jo31~'C~t " xjll-.im Cnotidotu wuli >uupl.j ronnecnoii >.rnslmme' dr P28 fi Oi P A e 5o» ACS Bav% filli"... ft 05 " i ~ detilils Nonll,,1 "lta,1 valuc [25 50 Br rl20'owersullllly"" l'5 45 PP JOp ar new roew wilh wllh mttruchexit. 22O/7«10VAC. itetails Normal rntail vuluc fzs 50 >C205 ar»o P/20 W.wer Supplv Anm k.l x.i CS t? <15 Si ( AlLPlii, AElO TrrhlK CCR MKrF MH"... i" f > ' 05 A P 39,"S1.uc tl(m~ previdus Sirw Sire 140nim 140n"n. 715mm 215m", «1 JO 170ml1"l mm Size; ~~!:m'.90. 1R0«J K..f^^1 ~,. OUR PRCE p g. ~ 1 SNClAR Project 80 OUR OUR PRCE f^pmn 9amm. * CUR PRCE C15.B0 P R, H ci SNCLAR Projecl 80 Packages a Also see previous page GOODWN CONVFflTER available Si(i-oSO P2J fjsfo.... P&P 50" OUR PRCE prasoo P&P50p scp.sratoly :t!~~,~~:: f3 r~o';~~~e5~; 95 H A H Mo val la b l e 7./40 ~:~:g SirraaCO ~::;:~:~ P7«:~~ f31 g~;~ M r P " ~ 1S P lsp 7>2M «Z.Z60 SicteoM Slcreo80' PZs Pl8 fjjsjl e33.55 "* ALL PRCES 11th 876 EXCLUDE VAT

11 [SEW] [5EWJ PANEL METERS SEW PANEL METERS ARE STDCKED AT OUR 3 LSLE ST, 311 EOGWARE RD. & 152 fleet ST.. BRANCHES or order by post USED EXTENSVELY BY industfiy, GOVERNMENT DEPARTMENTS. EDUCATONAL AUTHOfllTJES ETC. ~!~ut LAJMY. H', (!' n USED EXTENSVELY BY NDUSTRY, GOVERNMENT DEPARTMENT~, EDUCATONAL AUTHORTES ETC. Over 200 ranges in stock-otfiar stock-other range* ranges lo to order. Ouanlity Ouantity discounli discounts availaue. available. Send for fully illustrated brochurt. brochure. -C-L-EA-R-P-L-A-ST~';;G";M;';'O;';O;';'EL;;:;';SO"'6"'40;';';';'-""'---T'""":""~'~te-m-s-w7"ith:-a-st-e'~is7"k-ar-e =-=M-ov':"in-g ':'"r-on-t"""c-le-a-r-p~l-a-st--c-m-o-oe-l-m-r-65-p---t CLEAR PLASTfi MODEL SOB40 tem! with asterisk ere Moving (son YOUR Sl*t. Size' PS 85. x Mmnx 64mm ivpe, type, all otheis others tie are Moving Coil CLEAR Si,,, PLASTC MODEL MRGSP CALL NTO TOUR NEAREST &«: * x 78mm LASXTS LASKYS BRANCH OR &0aA SOuA... C3.90 SD830 SOuA l00ua.'5 Size: 110x 83mm ~gx:::~ uA... C3.76 ~., -~..... ~ OuA.. ^.. El uA j w i CLEAR PLASTC MODEL SDSTO 50u A 4 06 SEND COUPON BELOW uA. [ '." :~. NEW 32 PAGE SOOgA.. 1M, Su«; mm!:3.15 5O-0-5QuA l00ua S().c)'SOuA. 3.95, ~. 5O«-50uA _ C3.7$ 50u A C* u QftjA A CHS (3.SO. ^L.. FOR HEWJ7PA6E loo-o-loou l ua A S i OOuA t 34, SOOuA 3.80 ~~: :: :: ~: : ~~ '.,.,.. _. ~. ' ~ '". l uA.. Cl.90 1mA... 3 M 200u A O-0-6OUA _ - 3 J5 15 ^ H-F PRCE LST C3.15. So.O 5OuA.. U.15 ~~OAO ' ~~~A., mA SmA... _ 3.75 ham SOOuA B&O-BOuA SOO-O-SOOuA loo-o-jooua _ 3 J io»o JJ W [^~X \ CENTRAL LONDON C3.80 loq..o l00ua.. C4.30 ",.O.. 10mA loma 3.75 n.1o 0810XfOROST 01~9) 164 SOmA lma. (4.20 SmA. BOmA ^ f3.7s OO-OOO11A- CTS iev 10V OC 1mA C4.M 20 1 O-lmA" <3 60 S ^B 4810XH>80 JT CC 3.75 [3.10 ) WCl 01--'] mA l00ma.. CJ.TS Cl.75 20V DC - SmA - C4 20 ^ : 6mA <3M MJlBPC- J 844 ' 3.75 ~~A :: ~: : ~g loma. Cl.SO. VD LSlE WCl mA 500mA 3.75 SOV DC SOmA.. [4.20 lov SOmA " 3.80 av AC.. ;' Cl.90 ladc 3.75 C3.75 Cl.1O 118 EDGWARE RD. Wl -72] 1A _.. _ " n 60V DC 10mA., mA <5 SO _ SOV 'AC....' Cl.to '5ADC 6ADC.. ri.is 300V DC 50mA <4.70 QV C3 [3.75 ' 15V ~~~ ~:. ~~ ~g~ gg:: ~: : ~~ ~~: 3.10 l50v ) RD. W ) ADC loa».. c 3.15 J 7» re -1SVAC 300V AC. 500mA 100mA C JO 20V 10V DC DC - 4 JO " 0 300V DC., - 3 B ^ ;; : "to 3 l«le JT. WC LSLE ST. WO J S5 ' "M lie EDSWMC 90. wj Cl.15 la U.20~: gg Cl.90 RO. 01-7ll1171 BV 5V OC DC - - t3s7ft [3.75 VU Mnw 1A DC.... C4»o 300V SOV DC.. 160V _ - <140 W fogware BD. W7 01 M.. ter 4.00 BA Cl V )11 EDGWARfRD )17 ~:A~C OC..., C*10 00V ~: : :~ 19xvA~c DC.. 300V 10A DC _., Ct JO 15V AC.. SOCV AC AC, _., "40 C EDGWARE *0, WJ ::" ~: : : loa DC C3.10 S Meter lma )46 EOGWARE 01 72)4453 Cl.1O Mete' iftj~~~i1ncn~it~~rn------~5v~d~c~~~c~,~. MODEL SW100 ';'~V~U~M~,~t~ ~.. ~~c~,!.~~ 20A 15AOC )82 EDGWARE 01.72)4194 CLEAR PLASTC MO SH100 5V DC aoov AC,_ SMtltr 1mA "» 311 EOG WARE RD. W VU M»t«r - VU Mat».. <4 7D 346 EDCWARE RD. W J DC Cl.to la... [ t Cl.80 FLEfT ST. ECO 01-35) 51**: san Si.., 100* 100. SOmm eomm CLEAR ~i~,~~.p5't..~tlc PLASTC MODEL MR 48P 46P ~~ gg 5A 1A AC AC _ - a. _ ' 4 " 80" O DGWAXE RD.W FLEET ST, fc (2 C A.... Cl.80" 152/) FLUT ST. 01 )5328)] &OuA Cl.1O 20A... [3.10 SOuA..... _ 4.70 ".70, Siia: 50 * 60mm DA AC <3.tQ" ~ 5V DC '0 TOTTENHAM CT. 01-6)72ll2 locwa n.o loa.... c.:t,~o 17 =::~ -:::: HiO. ' SOu A - C9.U 30AAC 4 5J/3 fleet ST, EC t3i '.,.'._~. ".. ~A"" g : ~ ~ ~~~ g~ TornNHAM RO. 01-6)6171S BOOJA.. C* SOmA... Cl.80 SO-O 5OuA.. ~: ::. OOuA -.. <135 J: 30A AC. _ C1»0" 10 TOTTEMHAM CT, RD. Q Cl.0 - '- - - "., 2fN DC CT. 01-6) G-50u A r* «0 Cl.80 l00ma.. [3.10 OC-MOOJA.. Cl ".42/45 CT. 01-6) mA ~~c)'~~a.. m ~ uA.... <17D. - a 50mA AC 3 80" 2T TOTTEMHAM CT, RD S ~: ::~ 500uA 50-0-SOu ~~OuA A.. ' ~t!~ 75 '-i. " 1"~~~:l:~~;:,. > : -~-l^ 100mA AC _ (3 40' 33 T0T1EMHAM CT. RD A ~gxv08c:: 200mA AC C3 W TOTTENHAM CT. RD Cl. 3.80_" 257/8 TOTTENHAM CT A la OC DC... <*«o OQ..(). OOuA l00ua Cl.D \ 150V DC- - "80 500mA SOOmA AC - '<3 1 BO" to 2S7/TOTTEHHAH CT- RD. Pt A OC... «40 '''' (l().c)'5OOuA SOOuA Cl.'5 3:^^. <> S80 Enl.rged 20V 2OVOC DC _,_ (4..0 SUV 15UVAC AC.>... tl 455 S5 1mA lma - _ 105 n05 lllllldl^b ' BAKELTE MODEL S0O Enlaised Window S".:80xSOmm 50V SOV DC V AC * C. SS S5 &ma 6mA iljlilhh SVi: 80* BOmm if ESSEX 86 H. ROHFORD 300V DC- _... _ 4 C 40. 4~ VU Mfi" Meter - " mA ~OmA _ Cl.05 SOuA ~:. :~ 50mA &XiA f * M 88 SOUTH ST. HOMfOAO /106,'URCH'LL "'!E=-=D=-=G~W:::~S=E":'M=-=O=-=O=-=E~L~P::E=-=7::: EDGWSE MODEL P670 loooi ~A A '.... fjm 10CVA gg: SOOuA ~~,... 4 COlO 30 ~ 205/304 VCTORA CHURCHLL V'CTORA CRCUS. CRCUS, SOUTHEHO WEST. SOUTHEND 0M SOOmA Cl.05 loov AC (3.15 5O.().5OuA.. CC 65 Siai: Siz.: 90 90x34mm * 34mm 600mA 1ADC la, flm flw nos 5 300V SM.t,,'mA M*i«r AC- ma,, - <306 C115 SO-O-SOuA C3.OS 1()().().100uA.. uso \ " ' ''''',. / SOuA SOUA... r* 4.25 rt 5A ~~V~ DC g.: VUM«t«r- Y~:'ter.... <1M OO-O-OOuA ;,. ' g::. ~A~C " ~:.: ~" ~ -'./ 1DOjA - f«30 10V DC - _ C1M A AC _»» SmA 4 50 l.>*.1 l00ua.. C Cl.05 SA SA C4 la 200uA , ', SOV.. Cl.OS loa.. (305' C430 5)/57 UMOEN.. TUNGl W LU =~A ' ::. a 20V OC., AAC.... 1ADC <4 < \ X _L - 1 KENT SOOuA - 4 ~: :~ 00 60V DC -, A AC - 20V 5 ADC DC.. _, /57 CAMDEH RD., TUHOR DG 0892 ll242 KW)-60uA -. C4ic 300V JOOV,_ Cl OS AC... (3.05' DC.. Cr,'.lOlO locmmocwa- l00.q..l00ua. 4 ( BV lsvac AC DC.. "" <305 20AAC JU ^ 30AAC a'* - SOV DC,... < WELS... Cl.OS" 300V 300VDC.. 1mA - m titi CS.95 \...;.,.:... t-::':":~-::--:-::=::":'::::-::-::7""'::'~::'"-----t MOV 300V AC-, OC C4 \ 1 LECESTERSHRE.40 30QVAC.. ~'t.:.; :::- : 4 ~:: 05 CLEAR ~;.~~:.po~!~tlc PLASTC MODEL HB3BP VU M41W <4 80 _ 4 40 Sue: 42 42mm MODEL MR 38P 1-::~';:~::EM::::;:::;=:P~L-=A':S=T:::~~~::'":O":D=E':"l~. M':"R~52:O::P~--- bybhehbesgipi 45 MARKET PUCE. LECESTE~1l.S)767' 60uA MODEL E0107 ED107 ~, :. g~ ~" _ '._,~~ _,_. ' " Size: 60x 60mm Sin: x eo EDUCATONAL METER OOuA.. _.. 1 CJ JO t x l60mm i~ludi~ terminals SOuA...: " Cl.80 SOOuA.. Cl.to 100uA..., 'anti' of h. qu.lity. ~ '. J Suo: CLEAR 60 * PLASTC 60mm MODEL. MR 52? SU»: 100 * BO * l6teim including trmlojl* 200uA SOOuA,..... C2S0 Clio 5DuA 3 40 NORTHAMPTONSHRE ] ANGTOM STREET, A Cl.45 mavkmcoj f*?9* ot high hwrumant* v M ity SDDSOuA ~~~~A: loo-o-ooua-..: 1.10 <1.16 g :~: '.\. A - ~. SOOuA OOuA (ltd ~:OUA":: NORTHAMPTON S] 3.10 dml rj:."'1o~o~=n:::"? "ir JChf^i 600-& SOO O SOOuA 500b A.., <2 n _ (1<4.n l()()..q.l00ua.. Cl.45 mmtt ments end other bench lma... 2.'6 lma Cl.40 pplkitionl 4f»d oo>w eppfiutioj1$. 3" minor b««h mirror.w. -* 1 1mA - (2 45 loao-iooua 0-60uA (1 a 40 *t > '7H l ()'lma 2.'5.. Cl.CO led*.- c.le: Th«The mflcr me'" mmt~ may.». 2mA VOtmA, <2 < '5 55 llllljhh R^S SmA 1mA ^..,. 1*C "4a \ N STAFFORDSHRE] Cl 00 )0 WULFUM WAY, WOLVERHAMPTON mini mmt ii is lly...!ly KtouiW. accessible N* <$- SmA 5mA.... _ mA _.. "40 10 WUFRUM WAT. WOLVERHAKRTOH (2,85 50mA 3.40 dtmonjtrlte internal.. 2.n l00ma to cj«moritult«hltirnil 10mA a,., BOmA Cl.40 wckkino- working. 'fiel* 20mA (5 100mA...., ii ^ mA C mA 5OuA...'5.. Cl.1& la MuA C.70 l00ua.. (l.n 1^03 ' i 60mA V OC - 500mA.. "40 l00ma Cl.86 SOV.. Cl.16 5A loou A.. Cl.40 Meter lma.. Cl.40 C.l 0 l60ma 2.'6 l00v.. CZ.8! lov 5<H-.SOuA 3.40 Meter... (3.90,0 C.l0 jovm; lma 2OVor. _ ctio 150mA 100mA _,. - " V 1MV DC OC _.. fia 1ADC DC -.. ".40 <340 S Mem nma.. SURREY 1046 WHTGFT CROTDON ciio 200mA C2.l5 150V n,to DC 3.40 la. Cl.40 irtm - f/.aa 7.10 rjiu SOV of*.... tt 1.10 to 2O0mA fl V DC - _ OVDC a. "40 VU Mitir. _ 1648 WHGFT CENTRE. CROTOON ) mA CJ6 2.'6 300V DC V 2.90 SOV.. Cl.4O 5A.... Cl.4O KNGSTON ~ :.f~a.. 300v mA 2.'5... [ loa. Cl V [ Cl Cl40" 5ADC a'dc A ' c' 1(XVDC [ mA/5A "S a 0 600mA.. "» 500V OC - 50V OC - <340 1A AC.,.. ' [1.10 )8/40 EOEN 5T., KNGSTON K^nr " tl S SOOmA/SA la 2.15 l5v 2.9! 300V.. [3.r»O AC Cl.4O 5VDC (700 5V15OV DC 750mA - -» 48 7&0V DC _ 300V OC DC... "40 t3.*a BAAC 10A AC _ ^ _ 37 EDEN ST. K NGSlOK 01 P C.O Jl 15 S? fi E tvmv RCHMOND VDC V115V DC.. ttk C.O 2A 2.15 SOV [2.15 im/dt UC.. " " t'mi»» i/canr 6V/15V 15VDC 1.10 l J6A DC... MM C60 2 1ADC A DC "45 C2.ll 50V 15V AC AC D0V 15VAC AC - "40 "U 30AAC 20A AC " # 38/46 CD H ST.. KHCSTOK «>«-«< i2 HLL ST. RCKHONO (441 C.O X5VDC.... 'M 1/6A DC _,. BA ~~AD8c 10A DC DC " «2M g:: V 1B0VAC.. ~gg~ AC ~g.. ::..,. g:: BAKELTE BAKELlTE MODEL Mfl MR 65 Sa.: Si.., oo* 80. eomm eomm WARWCKSHRE 3VQC 3v.. - < BOOVAC- 500V... <110 Cl.l0 25uA ~ 116 5T., elrmngham CLEAR PLASTC MODELlMH MOOEL\ MR 0SP 0VDC., _ 7 85P 1~~ ~ g:: 85 SWu.rlmA.. e~t\:;.~~a :: g: S«A SCXiA (4 ~~ ' ~:~~. Size: S««; 120* x 1110mrn loirm 1SVDC VUMBt.r- - "SO OOuA.. ^ 4io 40 M > CORPORATON ST,, flrhhcham SOOuA Cl ",... -' -..:.. ' )6 )50) SOiA - «- eew, SOOJA ~, TOOu A.. _::: g: if ~ 1 SO-O-SOuA ri 05 n ^, S03 -.,-" ' SD460 rooc).jt'~a:: ~::., :~ ". All BHAH(H f SOP(NR'H 200uA n.»4m.clear Size: 59 x 500-().5OQuA 3.70 q"ll,,, bpm M O ~ 10 \Al =:OUA':: SOOuA - 5 «o, >-T^ : Siat: B9«PLASTC 46mm MODELSD« OOuA.. (4 WO-DSOOgA.. <*00 06 W _ * ^O&bOuA - CS.SS ~: :: 1.:~ yii ;. 50uA sai* ci ~~ :~ to 1mA, _ ~~~ma. g : ~~ 60V&5OOuA OO-G-OOUA.. C5.60 ~g:=: :: 5 ~: :~ 35 A " v i.hi 3f > ~. - ~~~ S? 1? g:o. "" ~ ' 1 l-d-lmft.... " JOftiA ~:.. : : g : ~~ 1mA U <.. OUR CUSTOMER n A - B^hbUM SOOuA tjso 1, v L. 5mA ~.... <3 70 to r -. SOmA.. Cl.70 JUOV UC Cl.to SER VCE S OVSO Natheatl utioce 8mA ~~m.~ 1-0-TmA - _,. C5 :: ~: : 35 ~: i SO-OSOuA.. tl 66 J 50mA- 10mA <3 ~~~A:: looo-ooua.. E ~t:: J W.. 100mA A ~:.... ci70 g : ~g ~~ ~g :: :: : ~t~~: Wll answer all your erhllhcs ~::: 10mA- 50mA- -.. < ~: : ~: ' ' 1mA.... _ 340 J 500mA.... <3 aoov uc - ~~: 6mA :: <3 g.: 40 ~: 1A OC gg.,., <3 70 MVAC.. g : ~~ ~~~:g::: : : g : ~:: lu st "ng mA =:: 100mA m ^ - _ ~: : 35 ~~ 300V 15V ~geva'f:: AC OC loma A0C SOV AC - ~; := 60mA.. ~~: :: 3 g:!: 40 OVDC lov DC.. SA 3.40 ~:AogC OC V AC, g : ;~ e~~:;;:: :: ~! : ~~. 5A ~~gg lat>c DC ~: : ~~ 300V SMittr ~~e~~~a AC.. 1mA- :: ~: :~:~: WOmA 100mA - <3 40 2QV DC.. " 0 DA DC 3 300V AC. g: ~~gg.. g.: 19~9g g : ~~ ~~~g.. :: : ' ~~ : ~g: EXPORT Pll~O". porl... lsa 75AOC.... C VUMel«r.. Meter.. _ la 1A DC <1*0 50V OC "«SA OC V AC C A DC 3.90.OA. [3.70".u, 1/1(1' d lor 0'" "d.., ",..,la'... 30A ~egg DC ~: : 55 ~: 1A ~::g AC..,. SA DC - < V DC "«aoaoc.... <3 70 VUM«1«r. ::: ~: : ~:: ~~A~ g.:!~~.ftc :.:, ~! : :: ~~V~ g : ~~ ~~:g.. :: :~~ : ~~: G ood., "P' C.llly P t tovdc - $» 6AAC AOC V AC - BOA OC J A AC kl r 20V OC DC AAC loa AC..., _ " 5V BV OC DC.. <3 300V AC.. "" BV OC AC 3.40 <140 VUMifBr- "55 10VOC, A AC. U C3.70. l'>ljl d.1, 111 dt,>p. ll cil,.t l u.1 11 SOVOC AAC loa.. <375 15V DC C3 ZOA AC 6.36" 20V Cl.70 SOOntA 3.70 p.ut., 01 tro world 11 11"'11'''''"1 1_ tbovdc., ''''5 30A AC.. - ".35' POSTAGE a & PACKNG 15p ZOVDC.... < A AC SOV DC.... <1 TO 50A AC. Cl.7' 50"". Cl." (o..,,.o;,u""\' afva T 240' 150V DC- 70 BOOmA AC " 70 TO SOmV 100m V OC DC 150V DC... (3.70 l00mv DC Cl.5. P,)l ntll' 11)1 tj.l tl k \.,,,,,, 240* Wide Angle Cf^ Cl ri,r'ld cil, qu' po.. ',lout" lmameters G) '.', Of monl ' a r ell' H ma METERS pt^ '''''1 1r-~--;;;-~;;;;;;~~;;E;S7R;;;~~;-O; (U lf t Cy MW1'6 MWl-660x6umm 60*60 mm R Jol TO LASKVS CUSTOM ER SERVCES DVSON ~ 8.50 fs.so P & 8< P lsp 15p K".?....-,.' Audrotronrc AudloVonic House. The 1 Hyde, Hyde. London NW3 NW9 6JJ. Tel:01 lel VW-B^O MWl -8 j80.somm xaomm Please PitotsBsnd se me the iho (ollowf/19 following teitw tems ~ BARClAYCARD [UO PloP 15p. f 8 * 0 ^p1cp ' i~ & AC Cf SS YAMABSH VARABLE ~~~::~~H~~:~~g~~ERS VOLTAGE TRANSFORMERS Phone VDU' orde r EXCellent txea4«nt quality qudity *1 at low coil, cost input: nput t o o r 230V 50/66H. SO/6OHz. Output 0-1G0V. 260V. FOR ^ 132 P^seh' 1 ' (6 call nt o a n y bran'_h MODEL 5;!60 S260 BE:~9.H BENCH MOUNTNG M L (tne. P&PVAT). P» p A 11 TOTAL PURCHASE PRCE PiP VAT> Hl.ff la 1A p BOp yr^\ J enclose cheque NO postal O.~'d:::: -..:n:::\o: ne~'~o~'d~e ====::::', 22.5A.~~ & A m:gg i?.50 ~: 60a /^itn^v MAL ^ ' efkcl0j * thtqub poit«l otav maney ordti U 5T ND DEPOST TERMS ORDER UnDcn J available on most goods BA 8A DO ,00 UO w,sh 10 pay BarclavcardlAcceu loa DA 33: ":00 1,00 ^ w** u» DJY by BtrcUsard'Ac**!! We speedy my number S '-- ---' 12A 2A ,00 C'tira^b Wa offer a ipeofly -'ifln* iw^wh n for personal callers efticlent 2OA Bun ^ T elficieni J ~: ~ :gg ~~. ~ service mail NAME CHEQUS lo THE VAlU Of lo. 26A f»5,m C1 RO V.U ACCEPTED fro PERSONAL SHO"US toa 40A Cl.M servico by mul HAVE j *C<E»D CHQOU JO f KOM TM( REMOK*! Mill CP <71. KCPrfK WTH AnlRS CARD. OTHER CASES ~~:E\= M0D6. S2W» P~::L PANEL MOUNTNG MOUNTNG o-de,. Rwn.mb.r ~;~~d R:~ e::; r ADDRESS A0M(5S 1 AND foil:... OU,.rs,. UClSS Of UD. 2.6A 1^00 SCp llfo mlh KR EARD. N OTHEt "8(1 lo add 8% VAT j ruasl rvuti 104 AMQURS N UCll D» llow n.. for CLu,UaC j -,C'~S... to total lot at value or of "KDtSDUm mcci* mat ".llls ouns "'CCf"fD. ACCPTQ. ion clumnci. ALL rn, PRCES &1 J goods aoods including - AllprkMearr.ctor pric. correct at 27/ 11 / 14 lubject to ch.ng. without notice E. EXCWDE EXCLUDE "AT VAT K post poll packing. Sign',",e SignaiuiF f ub «C1 tochnny. witjlout 17-11'74 BOllCN t.ao.e. A.n,o" o/"'r L ^ ^ ^ ^ ^..!: H.^.lF-irU-llinlonUfJo ~= e.::.'!~\l=::.3~~~ 3* al Xm» ' O== Ui,«-.«>1ci,=0~~o= P«c. LO«Uaf. '~::.x >W"Ol *.!~. PW2j AlJdO/(/nlC G'DJP al Camp.niu 877

12 "VFA 5ft below ground, same as dlpofe. Elevated 15ft., 1 '5' point UP on dtpote" comparison report by W70E, reid, USA. Gov'l tiectfonics Engr. ' "VFA 5ft below ground, same as dipole. Elevated 15ft., 1 'S' point UP on dlpole"-comparlson report by W70E, retd, U.S.A. Gov't, Electronics Engr. ABOVE m ALL ts the antenna system that counts -However good your S.W. receiver * W ha m a ts the antenna system that counts However good your S.W. receiver transmitter, if a PARTRDGE SYSTEM cannot mprove your signals, with the V.F.A. at same height, return the equipment (n transmitter, if a PARTRDGE SYSJEM cannot mprove your signals, with the V.F.A. at same height, return the equipment (in re-saleable re-saieable condition) for tor a cash refund 1 PARTRDGE r* R? ee have h. a t complete, mblb l e V.F.A. V F ' A - SYSTEM correctly terminated for lor your equipment, ranging from modern communications gear to the most modest receiver, even sma)1 transistor radios. Don't protected nm/er^h PflB PARTRDGE S xs?nr P WORLD o! RECORD pv«or, 1 antenna rarl51 stor system - D SELECT 0 "" 4 be satisfied YOUR with SYSTEM:- SYSTEM anything but the patented trade marks (Each System consists of of the the gold stove enamelled 7' T 6" 6" V.F.A..A. matching finish JOYMATCHA.T.U.-despatched JOVMATCH A.T.U. despatched direct by parcel post-our rlsk) :- delivered-our SYSTEM ^3. 'A' A for for r: "; Modern r ' sk) : 7 Communications,, Receivers,.... (all prices delivered our 29-5R risk) 58 SYSTEM 'D' -D' for other S.W. S.W. M.W. receivers, all all types types.....,..,, " " ** ** SYSTEM 'J' 'J" for for transmitters, ranamitlers. up up to to SOOW PEP, thru thru 10m 10m 33 tri '59 so JOYMATCH A.T.U. KT (1 (1' 6mHz-32mHz) 6mHz~32mHr) 8,24 JOYMATCH A.T.U. KT (500kHz-32mHz) (SOOkHz 32mHz) ^ " " 8,24 Either KT completely assembled ready for use " 7 55 en ks JOYMATCH AERAL BANDSWTCH" tuned tuned Aerial, M.W. & S.W... "...' '24 7a.,J SUPER SENSTVE GEN. COVERAGE MED. S.W. CRYSTAL ready to use, with,92 HEADPHONES, HFAnPuft»lpl: communications, communications. f' C f,? 8 A ohms, " & S w ' CRVSTAL SET * f0 u» i w " h aerial earpiece... 3 it,; 3 K '39 V.F.A. Stack Lashing (Supports VFA on on Chimney Stack) 2'51 t, i? V.F.A. Wall Bracket (Heavy duty) duly) ' cf 51 JOYMATCH Artificial Earth (Ground) Switch tuned.. ] ii!' 8 24 A.G.T.l,. A.G.T.U. Artificial Earth D..Y. add on unit for your A.T.U. 0'80 Radlals Radlafa for A.G.T.U. cut to required b, each ".. 0'80 fto "nvisible Aerial" wire, tough PVC covered 22 swg, per 10 metres... " 0 80 fn A.G.T.U. supplied fitted flltsd to existing JOYMATCH ATU's ATU'a (radlals extra).. extra) 0'80 Coax. Coax, cable, receiving rscelvlng type 75 ohms, per metres metrss 0 88 Jn o). Aerial Wire 16 swg high qual. qua), enam. ALUMNUM, per 10 metres mstres.. 0,59 in-s# VALVES, Complete Complets set for 9RS9DS 9R59DS '" 4 9R59DE, ncl. OA2 " '] 4'75 JiJ.jl SEND STAMP FOR DETALS SEND STAMP FOR DETALS 'BRTRDGt BOX 5 1D!!!J,,;llJlllfilC grtmsrms mr-mim, Cli;cTn B LEcwamc 0 N c"iij Lm Phone or or (after farter office hours) G3CED G3VFA BAJtCLAYCARD Buy H vnb Acm 878 THS CHRisTMAS M i Ji have a TV Tennis game exactly like he pub. have a TV Tennis game exactly like the pub. Plug nto your own TV aerial socket. Special fealures features inc. nc. score shown on screen, sound S4 SANDHURST ROAD. TECHN0MAT1G TECHNOMATC LTD. London NWJ,lOAD ' LONDON NW9 when ball hits bat etc. AC26 lip Up Rectifier. n; BFm ~~m3 BDG! ECTF!S AC27 Up 3lp S~OOl 6p , AC28 up lip vmet.mpf103 isiooi Raccifitra ap BRDGE RECTFERS MPJl04 81p N~004 8p la ~ tip 6p AC76 Up lip MPJlO~ 81p N p 56p Up 46p AC187 i p MPF1M lip oces 1S4007 1N*«04 flp 7p 1A 20p 30* 100? 21p 4»T 24p BOOT Up OC26 '7p BY127 lip CA Up tip lop 70p AC88 Up lip OC28 BYm 18? 2A 66p Slcnal RA - 68p 76p loop AO}49 48p tap OC35 Slcrtkl 4A 3Cp Up Bp Bp 8A Sp DSp 4Sp Bp 60p Mp 7Cp OC3~ Up Dlod AD61 80? 86p OCii OC" lip N914 AOl62 'p 88p lip N4148 SC.THYSTOS Ball Ball serves serves speeds speeds up up automallcally, automatically, bats S6p OC71 1X314 'p bats A"ll~ lip l8p TlP'iPfiO 1X «p scr.thyristors TP29~~ 70p OA91 p eo '00. AFU7 l8p TS43 6p 200 p la Up '8p lop will will defied defiect the the ball ball n five five different different dlrectlone, Bp KB«OAPX «p 50t 1C0T C-OT floor 78p directions, DCl07 2N706 Up OA202 6p Up Up 78p 88p picture fully nterlaced. Absolute game of of skill «f70a OA'iCO Bp BC08 Sp 8p 2K930 OA20S Bp 3A 1A 42? p 4S? 60b Tflp 76p 369 2N030 18p Z.nen 80p BtplUp for for all all the the family, BOl09 2N2646 8lp the TV TV game you'll never gel get lop SHMM Z»n«p» 7A 400/dW 8p lea - 78p 86p l80p BC169 tired lip 2N290G l8p 1-8W 18p of. of. This This s s the the ullimate ultimate in in TV TV games. Up 2N«0fi 40C3dW Sc fla 7Bp 6Op S; Mp lllp Wp BC82 lop 2K3MQ j-aw lap 2N2920 8p l-ow 6p TACS BC83 lop SHS009 16\V Uf 2N30~3 18p Other eo.,00. eoo. BC18' lip 2NS000 Oth«r TRACS 2 N30~~ 40p Dlod Tun'l 56p 89p l80p BC'1l2 lip 2N~702 lip AEYl 60p OA 88p l20p 160p No No other company car) cal] offer so so many features, Up 2K3T0S BC213 Op lop 2*73709 aeyii D i o d i Tan'l aflp 3A M; fior <»T 09p BOy 3C0* SA - 88; 220p UOp 2N3703 lip LD loa - 108p Mp lib complete BC214 18p 2N3704 lip n n Cabinet, tested ready for for use, 13p TL209 16, 16A - 1Up 160p OOp B0131 top 2N370~ normal lop normal price price , 00,-special 'special Christmas price <05 2X3705 2^3704 T1L209 LED 10; 10A lc3p 161p 165? SA U5p 180? ttkb price BD132 Bp '6p 2X3703 2N3706 lop prom_) For the the do-lt-yoursetf do.lt.yourself enthusiasts BFY60 Sp l6p 2N3707 DL SOCKETS (Low profll.} lip 8 l2p; l8p; 16 Up BFY~l logic l6p 2N p Mica Wuhera BUllbee (T03 or T066) 6p card with vision modulator sound Bp 2X3813 Hie* B pin Wubcre lit : 14 pin + 2 J8p; Du»he«18 it03 pin 14; or T088 8p amplifier assembled tested tested n n Kit Kit LNEAC. SEES MOSFETS form. Logic card with Modulator printed circuit.. TTL SERES ~ 50p ~36 n -es 7400 Up p 3NHO 6p board ~~6 120p Up p 3N41 88, instructions nstructions t All All prices C0 14p 7440 top ~67 B80p CA p 7402 Up atp , nclusive of of VAT T delivery. T4K 16; ; 709 Up /dc C4 16; ; p 747~ 58, p MC312U-eO 7408 Bp 7476 fisp BOp p p MJlC4000 top 7410 SC'p ? l6p p p TBA800 n-oo 7413 Bp ? 80p 46p C.MOS o o o l6p Up CD400lAE 780~ 18 i~1:~~ l1~e ; ; 7430 B? p 16p '6, CD40leAE."toeS 7812 '1-'0 ZN~ ? p 76p b CD4017AE Data sbta on above COp ea ; W? 85i> Sip M? 56 CD4047AE.JoS6 FOB FOR MORE SELECTON PLEASE REFER TO OUR AOVERTSEMEHT ADVERTSEMENT N N P.E.4WW a Send cheques postal orders to to Semiconductor Kits (inc_ OL Sockets) Logic Leisure Ltd., Kingfisher House, Complete Semi Kin (inc. DL Socken) SPECAL various projects available e., Park Park Road. Road, New New Barnet, Herts. for virioui projeetj iviilible ej. PRCES Herts_ Tele-tennii Tele-tennis cee 555 re- SOp Tel; : /4 Tri-colour Trj-colour Unit "j n3 55p PE Minisonic Miniature battery-operated Please send send s.a.e. s.a.e. for for further details. Callers P Minitonic Minixture battery-opented Sound 741 _ Synthesiser 25p welcome for for demonstration. Trade enquiries Synthe liter 741 "P Rhythm Generator CA3044 CA3046 SSp welcome- welcome. Export can can be be arranged. Novel Traniitor Transistor Tetter Tester MC30P MC310P Please Pi... send lend S.A.E. for for prlcea-... MC32P MC312P Minlnium Minimum Order price. exclulive of V P. P. && P. P. 0p lop order* order. bvow below 5, All price* cxduiwe of VAT.. Tride, Trade, Colle^ei Colleles enqutrim enquiries welcome. -

13 SHEER SMPLCTY! Tape O-p Tape o.p BASS Half HY5 Hill His VOLUME TREBLE BALANCE Stereo.Mono Sleree.Mono switch y N MONO ELECTRCAL CRCUT DAGRAM WTH NTERCONNECTONS FOR STEREO SHOWN d&ssmk "i The donlly HY5 Bulled s p for comolole both mono mono hybrid stereo applications, presmphflar, The HY5 s a complete mono hybrid preamplifler, deally suited for both mono stereo applications. nternally the device conalats consists ol of two hloh high quality ampllflora the amplifiers-the flrat first contains frequency equalisation gain correction, correction. while tha the second caters lor for lone tone control balance. control balance. TECHNCAL SPECFCATON nputs; Mag nolle Pldr-up SmV RAA: Ceramic Pick- TECHNCAL SPECFCATON nputs: Magnetic Pick-up 3mV RAA: Ceramic Plck up 30mV: 3OmV; Microphone tomv: 10mV; Tuner loomv: 100mV j Aunlllary Auxiliary 3-100mV; nput/lmpedhnce nput/mpedance 47hO 47kll al at 1kHz. Oulpuls: Output.. Tspa Tape l00mv; (O 775V Tone loomv: Controls: Main Control.: Treble output ± :i: }2db Odb (0'775V 12db at tokhz; RMS). 10kHz: Bass Active ± * 12db el 100Hz. Distortion: 0'5% 1kHz. Sianal/No)se Ratio: TOOMj. RatJo: 68db. Oletortion: Ovarlond Q S% Overload Capability: at ihhz. : 4Mh slonal/nolb* 40db On on moel most sensitive input. Supply Voltage: ::: 1~25V. The HYSO s a complete solid state hybrid H-F amplifier incorporating its own high conductivity heatftlnh heatslnk hermellcfllly hermetically sealed n black opoxy epoxy resin,. Only five cannectidns connections are provided, nput, output, power Unas lines earth.. TECHNCAL SPECFCATON Output Power: SPEClnCATON 25WRMS RMSlnto811. nloen.load mperfanca; mpedance: 4-flD nput SenBlUvily Senlltlvlty Odb (0 (0 775V r7sv RMS), RMS). /npul nput mpadanca: mpedance: 47kfl, 47kn. Dislortlom Distortion: Us Less than %at25w % typically 0-05%. 0 05%. Signal/Noise Signal/Nolle Ratio; Ratio: Better than 75db Frequency Reipcmae: Respon : 1(JHz-50kHz 10Hz-50kHz:\: ± 3db, 3db. Supply Voltage: :: 25V. Size: 105 x 50 x 2Smm. The PSUSO i ncorporates a specially designed transformer Cjan be used for either mono or stereo systems. TECHNCAL SPECFCATONS voltage: 50V l2s-o 25V). Voltage: PRCE t.~~~~: Output vottaoe: 60V 25-Q-2SV). nput Voltage; 21G-240V. Size: L70. V. L.70. D H.Mmm. H.60rnm. PRCE ttp t. ~~ v + 48p VAT Vf~! uj e PRCE 6 6 ~ P.. ~~~~! A P. free ienaluve nput, Supply Voltao»: ± t«-25v, TWO YEARS' GUARANTEE ON ALL OUR PRODUCTS.L.P. Electronics Ltd. Crossl House, Nackington, Canterbury Kent CT47AD mm The ampllder HYSO ncotdorallrib s a complete ts solid own slata high hybrid conducllvlly H-F Vollanei ± 23V. S!ie: 105 x 50 *?5mm. Piease supply Please supply, Total Purchase price Enclose, Cheque Q 0 Postal Orders 0 Money Order 0 Please debit my Access account Q 0 Barclaycard account 0 Account number Name & Address former The PSU50 qan ncoroo'ates be used a for specially either designed mono or stereo ranasyalems. TECHNCAL SPECFCATONS Account number T Tel (0227) 632t Signature 879

14 TRANSFORMERS POWER UNtTType fclls ~u~:~~ SonplylnR 6~~~Ty~~peA2S 6 or f> Vo^i PC at^oo in A. ~ncn~!u~~~:'~r n niouhuh ca»c forul forln- TRANSFORMERS ' '. :. lr.? ::; ur. a pin 3A ffinln- ~g~ ~,h, ",\ ",ai" ' :\/~:~: '~ -CA--SE-D--T-RA-N-S-F-O-R-M-E-R-S nrelrr odlpilt lini( CASED TRANSFORMERS wilh llctrt 4-way fllltpllt iimui'l"? h. a c! Hou.sctl smart rcmill '(:(latcd ~tce l ca!:'c8, SO Volts wllh ylvlnp 4- -J-1 ami r lutivlu~ ~ m tlnmco n unnrl rciln'cofltcl Pto«l ua-kw, 50 v lu 60 Volts * mm with 3-:ore 3-core powl!r puvfr cable ami Utlct nutlet socket., eockd. Prim tOV. 200'210V. aao-uov. :!~~~~ nckclr l"~ ' :~n~~lt ftn«t t;:~; 3'3 ~:::: fust.'tl toic"! primary prlnsory winding. bt^rf.iunu olallul t'ypci typtw are ate Sec. 8«. 18. P. 25, 23, , 50V SOY, Prim Y.. Sec , 40, 45. OV. plapx. fluml wllh 3-pin oullcl nockvlr, ond arc t,., Bee , BOV, "rj(.. llug~, Z~.~i'~b7;t!.it~-~~O ~~Uc~r ~o::~~ it ~~~p:~~.~ml ' ~;,~. '~ ' ~ ' ~l<'.\i" ~~!: l'w'l.. Price Prki K &2'25, Efi, Po-t po.., 1111'. H»;,. aveltabk with HQ voll or 240 volt output. Jin A luii* " :,'- Be/. (Plc~c <Pic*fc state). KiaU)..-\utn Auto t.rpc.ll lype* nrc nrn fittetl fiuml wuh wllh NV>. ' JVv f it l ri-i Ame Rrf, 'rl 11 ;' l ~ pln --pin flat Cat style t!uckrt ruckcln!l ") up to d,; VA. V'A. 3-pln 3-pin Cl ;, t> Ct-ft.1 ll:! frj 1133,33 0'30 r f) 38 sockets i 7GO to :WOO \'.\. See..\uto :mcl 10;: a oo O 3B n " 2* 4" 4' PANEL METERS rockcta from 750 lo 3000 VA. Sea.Aulo ntui 102 in^ 100 sas " 30 bulatinn likdallofi!\cctloll!'l Acctlon* fur for pprice*. 1 ft3 8 q-as r kc~, ;; ' 14 U-52 r 2'" 4" ('; fl~ 1 ~:: i 84 o e; ~17. 1: : " nnmpm ", rll \\" " ;. «\.!!"ilze: <XK: 4!" " Wi,t» -,,,.- SAFETY SOLATNG lo;- 520 " :"»'J f(lt; H rl'! t~~: 8-86 f-&; L t 43ini "'..-ttl (i lli-.: >liili, s. ~~ M'lnTn 11l11 lli-rli l i;:h ~-S'J :i~b's~;:~!~ov. Sec. 12(l,240V. C'.ntrt Tp ll; 11 1; lhji :-. 'll ",OlTU 40iom VPtei'. et) ~llm Derp. Prim, V. Sec. SO,210V. CPalre Tap 4 \ : H"! jm; 889 u-5? Det')' L. toi )'P7 JO 1:! \ftH'f!Jnf'f11 Alorrin«i>i l.i:.. L i\(u\'crnent M»i'ejnen< i.k. wllh ^eneo,. ttt: K. u-i; 4, fl Ufl7 l.ll Rol Prlcl' ("rit't "rk~' Ulullf' OlMm f-oo 1 10 Ohlll Ohliti VA ~ (waf.flol) Suo (~tlit'l l P iu;.!!" Oprn 'U"' J" 11!' 16,47 f),ui ~ Et!1 U :io u->50n»lcrn n,iert!,\ A.. t '-W ~50 u- n-oo no l1icfo iniito.s. A llfu Waltnl Ref S'.l, Prkr PUJ.'N Prkf PrJfa- PrJev.. a W., lib f;" 1419 rv97 Opcu Pet J0 lib 164? o-o" <!!J"!11. < pjlrro micro A. 1\. u80 {VftO n -100 OOntil~ mli<n> ru A.,\ Pill 1. l:arth mli't'i mlc-r.. A ;\. 170 O-SHO O ;j(lo l(ilrn> nkr... A. \ (1 14!1 7'3$ 0' '3S (1-1 nl." O- ft-l n Ul'\ «li 14!' 7 35 J-larrii 80 O-l LOO O'a':! ma in :'. A 170 T» 1';'11 17" n-j 0- O " ~Tll-\ 3mA 0 m Til 200 'JK B' :!on ~OO t HO 0 52 PrJm,.erun tia nl.\ i \ r. :.?JO 1 5~ \ -1t " \lii:.~ Hd. "rio'r ''' ~ \ 11 O'." R 1 0-lfi ma li o-a-f 0 32 MNATURE AND EQUPMENT 0-30 in A i'"." ':, ( :io ilia 11'; ' O'SO Sec. :-;,... ~. ~et -. N:,, :. :\u., n l.\ 11-;, On'. 0-CO tl-cft 111 in A S n-ioom.i *>* 0 )00111.\ (Hi ~ 15'88 0' ~!.!OH :! : ;~ U 1/ 10 CH~OO fll.\ (Hi 11-il v "'100 iootiia (ii ft-fi D BS Pxta. 240V r.ih with icreen. n -noo uj \ u 0- l.\ CHi i '72 1 '20 ~ soo.iu ;! ;~4 1' A'J' f U-.l ji n- 00iiiA n-500 MA o-c M O'BO 10 BO 0-80 B«. 1 MiUlmnp- Krl. 0-1 AMP n-,1 '.i 1 X~1' 11-; 1 100Cl tihi 32-l '20 ~ lo!lll :"l'.! H " ~(J ' Hi o-.t n-iamr n-l -131 o-o 'QQ Ner. Sx-. E.g. 1 l\»l t 0-2 AMP li-.l ^ ( - ~ AM' AMP L\ ~t O CH) " loof : ! la U H' } O 2:> Voll Voh.Hi: U - "!.~, Yul1 l.jk 1 5~ l.30k 1)-:,0 Volt ;jok 300(1 15! ".!:; 13 K u.-j-. " j.'i V.ilr v.dr Vn l lok 130( ft ? 183 t Voll 50K 0-30 Vr.ll 50K S O.A. 9-C 50ft.M"» 'JW 180 fi' HO 53'35!1 ;; SOO '.!Oi 1 76 Q ' 2~ 1J \ ' oil 011 OCOK iifttik :CJOK O-aun fnaun lhoo Vwb Voll ^O0K 300(i O.A. ' : 1000 KK 2J O.A ft i-28 > U 11 t' K 1» 33ft 33ft 23.". 14$ 616 :OOK ' 100(1 Oorl,.!o~ *V" HO o se "!" Mem )lett!r lio "t.:" )lelt:t 200 U 0-10 \'ti )tetf't li'.!50 tu ivu "k" "t" Mrter 2(K> 0-8-U *!' iowi 500 inoft sou i Vi: Mctrr 3200 VUUelrr n i Ml.'tl'r 5250 r;' cl & 24 Volts YoltS Prim V. 15-o-J;' <ft / 40! 24ft 20»> 316 :.! J ' Amtl.. vu Jtet. 'rh:, 1'0:4 11,; ~OCt :!Oll :.!:i6 VU Mcicnt leterl' ire 11ft! coniplrlf CVl(,kk oimi with «ti'i«vlorp. AtlllK..t,t.'dut... l g 12'- '..!4" Xo. 20-O -~" :w ~ "] HO Mad<m lodern wwr wid... vlrw. J2V J4V Hef. Vbt- No. 'DBt < " 0-16 U »» 200 vac SO 0 10 "jew O ~ 1), Hi ~4~ '22 1!!( LliO /W :.?3i Ppkt Price 2" 1315 '3 15 Po^t Post )0n. loll. 'rki Pl'!t'" 4" f4*l} 0-3 U l-w 0-1Q ,(, ~1t 1) 2;; ".. Jr, '.! ;j00 :;00 ~orl t';' H8 0 a8 Pfl»t O'2~ Poat lop. 101" ^iinpfi.nmpl't?6p 75p pi Ju t t wi. Oft 'i'jt * " 2ft 130 (fill S. 0 ;', 0-'10 t ~ft 1 or. ".!l:i ! O-'ift 2" 13 2" VW. f 'lh HO 0,(0 Hi, 2-31 O'SO ' 2' 'S8 1- WAtt \t. JOOe 1-: rau!;(! 100-1)[0 5(1~ "," HO. O '2~ su SCR1-: }-; ~' 1l1fi 71 2 OB l'~2 ~O-l!! - O ~ ~ ( ioo 10/<' 'l2j i watt CARBON FLM RESSTORS 4 v is 2'59 " b 12 - li :i500 NO SCREEN 11 f. a on fl<c " ! - l a ~u LOOO 1000 :!Ol; O'4!! t w*tt ai 7oc k 12 raucc ion- nrn s% 14 3 TV aso " 700 (M/Ci 22) Ufo HO t)'52 n, t.. t) - Hj -~7 h,l 11bftyuho\, K Q 0 10% lu 10~~ tul al at 95? 93p j)if per 100. >> 4 ma 480 0' ei 13 2" 100" 100ft vw ace Q 88 ' f ;i ".!7 100(1 1 oofl ~(- 3'52 (.J!i' H' 3 72 j~ 480 4'80 0 '5 ft «13 OHF 50ft 10"O 60o 203 -n 204 $62 83 ~ 1'.' " ft lfi 1'01 O.~2 f., rift $02 0,5'.' e 22 D'S2 C000 COOO MULTMETER 2"!! 211 rti > lr, 9'4i '69 Speclat Special Oiler 3" Offer i; «0 :, '" N? lh"j 1185 l1'i5 087 O 9j PLASTC PUSTC CASED SLCON BRDGE RECTFERS,to eo Couwnet "3" ,00 CnittlHWl <Jcnr-at f:cnt ~!'a l Pur- ~ul" ' ;;0 30 :?~; Q One AnlJ A'.-'trnv 81s Am' p4»90 pusc Mini Jliui Mil] llulti!llcter. il mm it ft f Ono Amp Two Amp Four Amp 61* Ami- npul nput llrsliitcmcc ltcsistnncc inflo 50 P..V. 25p CO P..V, l~g ~t~::= l~g ~:t~ : :'O: ~gg ~t~: ==: l ~ g ~:~:~:: ;g:...- ohms per \'ult 30 Volts P.LV. Up 50 PJ.V. Up 4 & 200 P..V. P..V. Zip 2Sp P..V. "00 P..V.46p 40p 200 P..Y. b9p 100 P..V. 7Op P.l.V. 45p '00 P..V.Up 200P..V.lOp. n:11l:"c ~: Prim V. See V. 600 P.LV. aop ( P.l.V. A.C 50p P..V. 75, (00 P..Y. OJ.t.e VnlU \ 'olt :-: o-l.l, 0- U, oo. 50, -'"O, ~iill.. Amp* Amp", Ref-. 'rti-e l'rk.. *Olt «00 P..V. top 400 P.t.V. S0p F..Y. P..V.a5p 75p P.T.V.«, P..V,Sflp. Post 1000 V No. t,,\ )"lj )(11) & PEn El~.nevnu- Vull..: o-i 0-10, o. yj. 50, 250. ijsc^tlll No, < ADD lftl«p,4 P PER ORDER ~;)O. O.i ' v 112 7~ ,38 thjiruiront DC Curr('ut 0"l 0--1 xn.v 7> 1-72 " ft-as m.\ : U ioOniA O- l OOm :\ '..! Huclstftin HO 0'42 Rl'::;islnlll:c e 0-100K O-}i:iOK olllii- 1l1 1111~, 2ii i OJ PLEASE POWER UNT Type CC 12-0 Kjzy... Ct "2 Size '.'0 '.:11 :: ;: 24 ~-l r< x VO tlo jmu "52 Output U Complctc with Catll'rh:s, T ~ "l Prod", H ~ lructi ll l! s. Spr!cial p r il" 3,20 p(l~t ~nll. 61 HO 0-52 Cniiiplctc wit s DnUirkt.. Tn.s 'rmln ; B2 ADD 8% f» 12 avitched volts at 3, , ma fl. D.C. 7%» Operate* from 240 V mains nxliucllntin, flj^elnl prlcf 13 BO 20j>. " > 85 8b FOltable lor Uadlo*. Tape H, 9'J 8~ FOR 0'67 VAT 8 Becordere. re 7 6 x 5 Record 0 x 14-0«n. Player* Prcr ele CFOOt COO MULTMETER Prat 25p. METER AUTO TRANSFORMERS (n^nt!jllt tcvidlancc 20,000 n C/! i~tall ce 20,000 oliiii" ohllt!< V'f J:r v*ill,-,,11 P rlcc Overload O\'C'rlll::u1 prnic-llnn VA protcdion VA luf. Het, Casetl Price Price Cased Plug* Price PluCf Open MNATURE NEONS OPC Ph~ 1 f.mm dl:1" ~mm.eugt b lcadl'l apllrux. ~ (Jmm. ~ecolll ' 130 WaUt' N o, t &: :' llhl J:iO UA L.\ Tiirivciiieiit, ruon:lthmt, cluftr d cn r wali" Watte No. C 2 A 3 nlh C fimm 1oi1;11l' lucllllcll ballasl rcah:!tor 150K ,eration Tappet! at llu, :2~f, RnriRnS AC Volt... 'rit c: l'ackct of10 for GOp. Postagl! Rlg: t'~-,\c VnTu "lilts ,."ill, no, 250, :!:in, UHJuV Tapped ;st VoiM mcndol tlln.. ballast 2mtu resistor length caj* 1S0K length ohms ap]>tvx. fur mtn. Volt operatloa itecoui- UtO \ ' H :it X; UG Volt* " ult :: 0-a, O- S, 25. ::!,j, 125, 12.; floo, 2500 :!.;n()\' v M 'rke: Packet ol 10 lor COp, Postage lop. Tappet TapPclt nt at ll i,. :200, '.!20, :!40 \'tll,. DC ne ttonvnl CurrenL n ma m.\ 150, l.i. 22U. 24ft V«1le & ' RMUianvo nl'l'istancc 0-C0 O-GO Kyhcii.«, Koluns, 0 O -(j -0.Mnhin* ;\1,,11111" :!OO lio 4 S i;j '15 HO 0 4" Dedbrh fili ' O':!:! J)ccibl'! :!(o tu +22 +:!:!!». 300 «<: S [i D>40 W. UOO jj 'arrj-ltip e-99 0' ; C.arrying CUP. Cnollc. Ti-Nt Pn-- T : ~ t f'rud", mil 'lul Hriltiili* Hat t.-il''' hiceis'lol. 730 i :: " inclullcol, ~, tjlxc: 0 8" Size : lt-il.j x 8,1 8 ;4 x.;.: i t in DOT A.S.P. LTD (' !tj {;j '58 HO PW2. SMMONDS WNCHEAP. rrict Price *9 9,85, 85. Post l"ost 20/ 201" ( '10 i ft DEPT PW2, SMHONDS ROAD. WNCHEAP, fift 'SO 3000 CANTERBURY, CANTERBURY. KENT. Tel: (0227) (OU7) HO MASSVE: CLEARANCE CLE:ARANCE: BARGANS Birjim Barcain compon.nc component parcels conuin contain Resiscors, Resistors, Capacitors, Pot«n- Poten.. elometcrs,,iometers, Knobs, Rotary Slide Switchct, Switches, P's, F's, Taf Ta, Strips. Strips, Drive Drums, Coll Coil Formers, Wire, Wire. Grommets, Relays, Pulley Wheels, Wheels. Magnets. Ma,neu t Transistor Panels, etc. Save yourself '$ 's on these thele well selected lelected parcels, 61b net weight 1-00, '00, p.p 50p. SOp. Br New Wire-wound Rosiston Resistors 1-7 watts, mostly Plessey GWS GWS Good selection for (or 1 1 *00, ' 00. p.p. p.p. 20p. Muilard Hullard Ferrite Cores LA3 Sflp, SOP. LA4.. 7Sp. 7sp. LA700 LA p, SOp. SPECAL OFFER. Metallised Hetallised Polyester Capacitors by by Erie. Erie, Muilard, Hullard, etc. etc. Values V.lues nclude include -01/160V. '01/160V,-0/250V, 01/250V. 'OS/60V, '0s/160V,-022/160, '022/160, -033/160, '033/ /160V, 0-47/160V,-060/160V, '068/16OV, -/MO-TSOV. 1/l60-250V, -22/1607. U/16OV, etc. etc. Thli This is is a bargain bar,ain not to be be missed. 100 for (or C-50, 1'50. p.p 20p. Assorted Capacitors. Capacitors, Silver Mica, Mica. Tubular Disc Ceramics, Ceramicl. Poly- Polystyrene, Tremendously good,ood selection..election. 300 for 1, 1. p.p. 20p. Please add 8% V.A,T. VAT. styrene. Mail Mall Order Only. Only_ XEROZA RADO,.. EAST STREET, STREET. BSHOPS TAWTON, TAWTON. DEVON. 880 FELSTEAD ELECTRONCS ELECTRO~CS (PW88), (PW88). ~~~~g::;i~j8 DE arnj. STYL. Rep!*renqnt«Replacemcnts for vlrtiully virtually *11 all ACOQ, ACOS, B9B. BSR, COLleARO. COLLARO, O GARRARD. ARB ARB, PHTLPS, PBLP8, RONETTE, SONOTONE. Single Sapphire l b, 37p. Tip: Can be 8t«r«o/LP BONBTTB. 80N0T0NE. Tip: Bapphlro 9p, Diamond 37?. Double Ttp: Cm b«stereo/lp+78 ST/LP Sapphire 87,. Double Diamond ST/LP+ Bapph1re '. Dlarnond Diamond 6T/U> + 7S or 8T/LP+D!amond +Diamond ST/LF BappWre ST/LP 87?. Doable 8T/LP 11,25. For GOLDRSG Tip: DEpmond NG Diamond + GS00. Bopphire G800. G8M 78 Mb, G800H G~ O at 12'10 G800E at 14'10. Charges lop any quantity LJST FULL 0830 at DETALS each. 8TYL O800E at STYL AND CARTRDGE Chances 10d aay F.QUJ quantuy EQUVALENTS VALENTfl FREE locmtob LST (FOR ncluding SHDRE. SAE) SHURE, PCKERNG. AUDO TECH. &: 0, STYL MAGNETC AND PCKERNG, CRYSTAL AUDO-TECH, FlCK-UPS- B 4 0. AND MANY MORE STVL FOR JAONETJO PCK-UPS. CABTBlDGBS. witb styli fittings. Replacements,",-COS GP/91 se (Stereomono compatible modp CABTREDQE9. All sctioa) wtlh flyll scries) at at il-bo. A'20, OP93 flfllnga. GP93 Stereo Rpplacemrnts at at < OP84 for A GP84 Stereo OP/ei Ceramic BC ifiwrfo at at 2'M. 11,20. Aclmd Actual GP67-2. OP67-2. Front awllch wltch.t at J for 10r BSR Z3H. X5U X6H *nd ""d X611 X5M at at U-fiO each. 8K5a SK5H anet 8K5M. at 11,80 eacb. Te8R at 11.80, TeS 3 pins 12,80; cbarges quantity, 6K53 at eacb- TC8H at «.63. TCS Stereo, 8 pin a 12.80; charges lop any BECOKDDQ 1':C6~fil1lo TAPE, TAPE. ALL VKEST }'NEST BRTSH MYLAR YYLAR 6* 5" 60M. 600ft. 40p; 4Op: 6" ~" B00«. 900ft. 0Op: 8Op: fi " 6," 1200ft. S'p, 7" 1800n Charges 5" 6t H, 1-413, eacb ; 6 88p tbe ot. ot. Cbargea J2D0U. 84?. Charges for 7", 7" 7", 1-3 SOQft, ibp p each. each, 4-5 Ctargea 4 $ 86p alip lh«for the lot, 3" lot. Q 6 6}*. over p 18p top the each: lot. 6 over, 83p the BFEAXERS SPliAD8 Cj'. 21". 3, 3, 08 or or obnn ohna (ctato (.t.te which) wblch) Wp, Up. Charge* Charge. 10p lop each- each. COflSKcnEO COlllll:OTlfO Pkt COU, auld. lip 81. (Chirgei (Char,e per WRE. pock]. Pkla of 6 colli. asatd. cola each 6ydi. Solid core 19p Flexible 21b pack). EARPlEGEa, EARPECES. Magnetic 2 6mm or Hmm (.tate 15p. CBYTAL (S'6mm only) aflp 86p (all lop up Majnette up to to 0). 2amro or 3-6mm plus (itale which) Bp. CRTBTA1 O-Brnm oaly) 6). TOSATOB3. VBRATOBB. 7 pin SYNCL. (12SR7 75,. (-pin NON-'}'lcb (121HD4) 46p lop lop each). 7 plo BYNCTL. (2SE7 type) 75p. 1-pla NON-synch <121HD4) «p (all e&cb). Send Bend SAE 8A.E for for free elyll. tyll, cartridge, acceawries acceeaorle.s ccmpcccnti componentl tt. Hst. All All prleea prices ndndfl nclude VAT.

15 NEW MULLARD & MAZDA VALVES TRANSSTORS-NTEGRATED CRCUTS All individually boxed bvddbcc All transistors,.c's offered guaranteed. Full EXPRESS EXPRESS are new bred. trade discounts to bona, POSTAGE,, ' POSTAGE Manufactured by Mill- Mullard, fide companies. Price SdV^1110^1 (or each additional add iard, Texas, RCA, Fer-. Up 8p for 1 Velye. Valve. fij 6p for tor flnt lirat Tratuistor. Translator. Each addltion&l,valve tor ndd add Bp. P- lp. ranti, Motorola, TT, availability lists on.. GY501 H81 PLS" C1/POFSO application. jg ' 118 AA1l BDU4 HO GZ34 00'80 PWJ PLfl3 PLS3 tssl 1* SOC/PCJSO 1-04 '^ AAZ BD DM ECMS ECLS PCflfl pcss BD Fairchild, Lucas, etc. 0'96 PLB C15/ AAZ BD!32 0'60 DY ECLS PCSS 0-95 PLOOO P CFSOO A0107 0'86 m'!16 0 1/2 application. DYB6/7 DYS6/ EKaO ECL80 EFSO 0-42 CM 0 42 PC97 PC88 95 PLfl4 PU socio; UDUl Quantity discounts on 0'42 42 PCF B0152 0Fil applrcatsorir Send SAE PL A BF DYB EFS PC PL304 PU PL50S C DF S/ AC EABCSO 1 03 EFS PCOS '51 PL303 PL509 t-88 30C18/ BF for full lists PCFS ACl BF EB EFS6 H6 PCC '80 PLflO-2 PL80:.! 1-40 PCF nf F5/PF818 A ZTX600 0'16 2N EBCS EF PCCBS OSfl 0'86 PYSl PY F6/PF818 BF OA A0187 0'80 BF OU ZTX N2904A 0 25 EBFSO 0'68 EF PCCB PYBl/flOO PY81/S EP1S 005 OASOO O r 2X FL1/ A018S 0 20 BFU OD ZTX N EBF EF PC01S PYfi-i PY82 0-6? 30F.1/ DP X2904 A o-a1 PCESOO 0'80 AOY BF OC20 2'00 ZTX N2905A 0 25 EBFS EF PCFSO 0M 0 51 PYflB PYSS PCESQ0 080 BP X EF1S PCFS PY500A AOYU 0-85 BFU7 0' '25 ZTX N EC PY300A FL2 080 BP] 67 Q15 2X2903A 0 26 EF1S POFS PY FL12 H8 AD BF GC25 0'40 1:< N VCV* E08S KP PCP M FYflOO PL BP X2928 2X EH PCF PY FL ADU9 0'10 BF OC.8 0'70 N4001 0'08 2N3053 0'20 E090 n.r«0 88 BH PCP20O 1M 1(H) PYflOJ PL14 0M BF X EL POF U L1/POOS4 AD10l 0-89 BFB ' o eo E TOO U'lR L1/PCC84 0F698 EL pm'801 0' O at AD BFW G036 0'85 N N ECC U M BPW X3055 2K EL POF U Ll5/ AFl '28 G042 0'40 tn N U]93 0-M 30L16/ EOOS ELS POF806 0'84 UABOSO 0 90 PCCB AFl8 0'21 BFX8S 0 22 OC N4005 HO 2NS UASC PCCflOO 'M BFXflB BFX X ECCS '86 POH200 H8 UBCB L AF BFY G045 U8 N N JJJ ELS5 0-BS PCH UBC8L 071 3DL SFYflO 2X9615 2X on ECOS ELB PCLS2 0'68 UUFS9 AF BFY H 1N' N370J 0 12 EL PCW2 O-fifl '88 30P4MR 1-21 ECC EL POL UCCS5 AF239 0'89 30P12/ 0 44 BFY O'De.N EOOSS S'li 0 84 >-^81 fr00 PCL83 Q-M 0-64 l.'ccm UBP8B P4MK 127 BPY61 2X BY N4UB N3706 EL PCL U()HS1 H2 PCB01 ECC1S ABY UGHfll PJ2/ EFYB^ 0'80 BY ELLSO 2 60 PCLS UCL A8Y 'N3708 H 064 UCLfl PCfiCl 101 BT X3704 2X o n EC,'SO 0 80 EMS1 1'10 PCLS6 0'84 UOLS3 0'12 POSO" 0'89 BA N '25 BZX61 "erlu OOS1D \ N3708 ECF82 O-Bft 0 88 KM84,:MS4 110 H9 PCL805/ UCLfl P19/ BY POLB05/S5 UFS9 0'80 30PL1/ BAl Z 0' A EOFS EMS7 H6 0'64 ULB POLS B '20 2N3701l 0 10 ECF86 OBB KU i 4 UF89 PC BY NJ UL DPL/ BZXfll MTlei OC81D N fill BZY88,erlllJ 00S EOHS En PD500 1 S6 UYS6 30PL13/ B0108 0'21 2N UYM 092 PCW01 1M BZTSfl Mfles 020 OCfllZ 045 2X3708 OC X N696 EOHS EYS6/ PFL O/30L2/ POL600 H '11 2N37l /S0l/i/ PLia/ ORB N697 ECH EYS8 0'12 PLa ECCB04 0'$8 30PLH/ BOl 3 0'11 2N ECCfiOf 0-DB PC WOO OC X3710 CRB ' 11 CRBl, N ~N EC EOLBO 0 81 EZSO O-M PL F23/E,'S12 PCL BC1l OR N706A N3S23 NO ECL82 WO EOLS2 0 8? KZ8 EZ80 EZ M ' PWlA FLB1 PLS1A 0 07? 077 BF-JS/EFflly 30PL14/ CB81< OC X X Oil 080 0'90 SO M PCW8 185 CRea OC X PL10 SOPL H3 BOU C803-4O OR OC M 2X NllS N3903 ' 11 B MJB340 MJ1340 O OC202 OC X3803 « N N B oje OC N1302 o-1e 2N PY500 PYfiOO 1 HO 10 MJES70 OBB OC X9804 6F:.! B J OOP N130S N NEW VALVES PYfil/ROC PYS1/800 0'80 60 KJE69Q 085 OCP X J6M 0'85 B J12855 ORP N1804 0" 1 2N4068 PY801 PYS KJE76BJ 1-10 ORF X '15 6J5G 0'20 B0182L 0 11 MJESOSfl MJ ORPOO ORPO X N N4019 HO SP J6 ndividually boxed 0'86 B0184L 0 18 MPF102 KPF T1005 T X4058 2NlS N P aj7g 0-80 B033M 0 15 MPf]05 KPF T1C44 TC X Oil 2N N'40U 0 11 T41 -OD 6JiM guaranteed but 0 88 of Euro- BCYl2 HO MPF104 MPF TtC9S0D T0226D X4001 OH N408~ 0 14 Ul K6GT 0 80 BOY" 0 18 UPP108 MPF TU09 TL X4089 0U N N4289 U25 -OD 30 6K7G 0 88 pean or other origin at BOY" 0 41 NST46 NKT ZTXJ07 ZTX107 0J N10lS N125 U K7l1 1' BOY OAS OA OBD 0-80 ZTX108 ZTX0B 010 3S185 2X< HO 2N anu1 U KBG 0 45 BOY71 ' 11 greatly reduced prices OA ZTX N2147 UABCSO 0'40 6KSM ' UACCB BCY72 0'15 OA N OSS! UAF42 0'15 6K Quotations for any XfAlVl K8M 0-70 ZTZSChO 014 JK ZTX BOZ OAl 0 10 ZTX302 0-&0 2N2889A aa~ UB041 lfac ZTZ Q L6G 0 68 BD101 1'00 OAt! 0 07 ZTX N2848 UBOS Q7G 0'10 404, " valve not listed. Send UBC ZT UBFaO UBFSO 0-60 HO 6Q7M 0-60 UBFS N N N N L7GT '81 8N SAE for lists. UBF89 CCC86 8N7401 UOOS N BN7474 O ts 8N74nO flsl7gt 065 BH743B 68N7GT '57 BN '88 UCK42 UC!42 0B0 8SN7GT 0 66 BF X7473 8K BN N742S N BN741n 68Q7GT N74174 AZ1 0'151 EF N7S 3'50 UCHB UCHS1 h50 fl8q70t 046 BN X X X B 0-57 BX741C BN U6G NU'O 0 an7471 8U6C1 l' 5 RN M7470 Oil 6X X74X BN7411S 1'00 SNU AZ EFSO 0 35 OA UCLS N7404 6V6G ' ' N NU N CflU] OBL31 HO UCLftl 1-40 EFS5 H5 OB~ 0-45 SN740. UOLS RHGT HO SN SN7482 H1 0'80 0-" 8N CL83 OL UCLftS SVflO M BK X74113 l-co 6X EFS POSR 0 86 BNUOS UF X N BN7481 1'20 8N '80 8NHlU CV31 OY UP V8GT 00 BH X X74119 i-02 6X X N7U X BN X EFS rcss 0 65 UFB BNH N N BN7412S 6X6G '44 8N DAFfll DAF X N X X X X EF PC97 0'85 BN740S UL SNH N7488 HO 8N X6GT 1'00 8NH DAFB6 DAF96 O-flO 0 80 EF92 0'60 FCflOO P SXBUT 056 BN74< X X X ULS4 8N740l NH41AN BNH BN741U B H4 8NH DCC80 DOC90 1' EF FCCW PCCS «H 744 AN 6X X '45 B17410 UY B '0 O O at 86 BX7491 8N7481AN AN 8X74X X BNH BNHl85 1'44 DF EF9S 0 80 PCG88 PCC8S UY N flb7<49 8N7H2 0'B5 HO 8N74U '15 SNU188 l-68 DF96 0'80 EF1M EF183 HO POOS VR105/ BN N BNH92 0'11 BN74164 J N741g DK91 0'60 EPlfi-l EF HO PCClflO PCCS9 PCC VH105/3n N746O X X X7492 Q7 6X X74195 BX741B VR150/30 0'45 BNHl HO BN BNUS NH155 ir H5 8N74D8 ' 11 DK EL32 0'60 PCF80 POF VHBD/ f17451 O to OA R7 BN7418 HO BNU51 0'.0 SN7494 0'86 BN7 U H5 8N DK98 DK ELS3 2'00 POF OB NH NU54 0 '0 BN749> 0'86 DLW DL92 O 0 50 M PCF OAS 0 46 ek7«8 o-lo 0X BN74fi4 0K74fl*»0 1 6X X74) X M 0X X X X BBS ELS4 0'10 PCFS6 POFS R Y N74S NH98 1'00 DL 15p DL94 H8 ELS PCFaOl POF ' HT NH BN NU DL EL PCF802 PCF ATS 46 0N747O 8H74flO O X7480 0X dil 14 pin 5p 1T N N7472 0'88 8N p 0 45 DY ELt PCFfl05 PCFS06 00'90 12AT7 0 0X X lfl SOCKETS 16 pin 7p AU DY EL FCF806 PO,'S '.'AUd SV DY ELB4 0'85 POFS R4GY EALCflO EAUCSO PCF8fi EL POLS U4U BA EAP42 EAF SLL80 ELLBO BOO PCL R40Y AU POLS Y3GT RMl EU EM80 E S PCL r.u40 OH 12AX7 15DA THS MONTH'S 0 55 PCL84 PCLS4 060 flyaot 66 0'50 6Y4G RBC33 EB033,_ EMS PCLM POLB BYtO 80 12BE6 60 GZ4G OD EBC EMS4 HO POLS /3GL O~ EBC81 EBOS1 040 PCWfi goci 0 46 VAT v n 0 40 EM PCL800/85 WOVl 0-90 OSCLLOSCOPE TUBES PCL806/85 6AK EBF80 EBFSO 0-40 EY AK H F5 8% 1-00 to be DFS3 Em'S EY PD360 PD BAQ O~ EBPfi9 EBFS EZ PEN A87G FL EBL3 EBL EZ PLa AT FL BCC81 ECCS1 045 PLS «A8?r. 6AT FL1 106 Types CV 1526, 60 50PL FL added to DG 7-5, VCR 139A 0 45 EZSO 0-30 PLS AU L ECC89 EOCB S 30L EZ PLB BA L ECC83 ECCB3 00'38 88 GY PLS p & p 6BER O'U 30P4MR ECC84 ECCS GYOOl O 90 80L GZ PLS BH SOP ECCM ECC M S0P4MR 1-30 all orders All at 8-00 each, -i-pap25p. d 4S GZ PL BJR 0-15 SOP ECC88 EOOS8 00'60 PLS P GZ34 0'15 PL BQ7A PLl 0-95 EC35 ECH PL304 HO GZ PUOS BR PL13 HO ECH42 EOR RN PU B87 30PLU HO EC81 POSTAGE ECH HS3Q6 160 PLB UQ7A 0 56 S0P19 95 including 0 35 KT61 2' Bwa -OD 30W ECH83 EOH83 O-flO KT PL309 PL802 flar7 120 SOPL 0 95 J " 8BW«1-40 aopl/13 1-1D 2 00 aopll4 -O POSTAGE! SPECAL OFFER 0 50 KT66 2' BW7 -OD 35Z4GT 0 10 ECWO EOLSO 0-60 KT KTS1 PX OCD6G ECL82 EOLB KTfll (705) PX4 80 8DW BWJ C S3Z4GT '30 PY D6G accepted_ 60W S13U88R 8 00 ECW3 EOL '16 KTSl 1 15 PYSl H6 HO S13TT ECL85 EOLS KTfll CD6a ecne CD6G S TERMS OF BUSNESS: C.W.O. Ale's available to approved 1-00 companies on application. Telephone telex orders ac KTS PY ECLWOO ECLLROO KTflfl 2 90 KTW61 HO PY", 0 50 fif2:t A 1-20 application_ daily KF37 EF~7 y \ 1120 KTWfil flcw fllsltt Mill 't ' fif S13U8SR 0 00 cepted. Export trade enquiries welcomed. Lists, etc. on -OD 'y ':1'-".-, 1100 flb6a 1-80 application. Open dally to callers 9 a.m.-5 p.m. Mon.-Sat. Closed Sal. 5"1_ 1-3 1~3 p.m.. Prices corrert corrpet when whpn oolng aoing to 10 oress. press VALVE MAL L ORDER URDtR GO. CO 16a Wellfield wellfield Rd., London, SW16 2BS RST Tel: Telex: B8i

16 COMPLETE STEREO SYSTEM COMPLETE STEREO SYSTEM & > FOR AUDO ATABUDGET System * <d 40 Witt Watt Amplifi.r. Anplifitr. Viscount Viicoun? 111- ll-fllczoawzdwaifjf^^n^t- R102 now 20 watts per channel. 'Jf SYltem SYJttfT. includes i-clufljj; : Viscaunt VlKOBBl tirpliliit amplifier - ~olume kofofflb., ban. bass. Hebla treble snrf balance bafarce controls. cablrois. plw plus switches for monol nono^ stereo $ttr«o on/ott on/oll function foflctiait bass a ad freblo treble filters fillers.. Plus headphont beaifphwi socket. sockel. SpecifiCltion Sptcilicttion 20 ZOwalti watts per channel into inig 8 chns. ohms. Total disicrtijp 10W lldbl lkhzo l K.^./ Ya. f.u.' (for flo.'ttfamrc ceramic cartridges) uruidgej} 15DmV SOmV into iata 3 Mig. Meg. PMJ{for P.V.} (lor nasrretic magnetic cartridges) cantidsasl <nv 4mV :p, S 1 UH; khz into 47K. eqi equalised ilisid witfiiii within,-:- 1 ds db R.AA.AMS1 R..A.A. R,dio 150mV iscnvinic into ZZOX. Z20K. (Sensitivities {SeiilliyiliM given Given amcllpewerl. at full power). Tape Tap. out facfliii facilities is: : heatfpboive headphone secket. socket. power oe! out 250mW SCnW per th channel. aoorl Tout Ton, contfdts ccttoels,nd»eimet filt" "'",cfe,ist;cs. Bass Sass: : + 12dB J ZdB to - -l1db?d8.t! -j 60Hz. EOHt Bass Bjss liltn: filter : Sd3 6dB pet per oiiavt octave cut. cur. Treble control: coetrel: treble -f! + 12dB ZdB to ro -12dB -ZrtBla-TSkHL ~ ' " 15kHz. Trabfe Treble filler:!zdb : 12dB per o:«>e. octave. Sijnitoasise/ith: Signa/to noise,,,/io: (all loll controls coot/els at 81 «a*.j max.) - 58d8. SMB. Crossulk Crosstalk buie/ beuer tesn than 35dB 3SdG on all ail if inputs. mi. Overload Oy"erload characteristiu characteristics bener bitler rtaif than 26dB 26il8 on all inpots. inputs. Size Siie approx. approf, 131" 13J'>.9V.31'. x 9"x ". Glrrlrd Cartard SP 25 Mk d"k deck wih with napneti: magnetic cartridge. cartridge, de if loxa luxe pbetbord pli nth fciaged hinged covet. cover. Two Oua Duo T?pa TYPlllmatched motched speikbrs-fwcstre speakers - Enclosure size s'te approa.tj-xlor* approx. 17 i""x 101" x 5' 6'" in simulated teak. Driye unit 13"x 8" wilh parasitic tweeter. 10watts hling. J(* siculatic leak. Oriva mi113*x 8' with parasitic i»eatar. 10 watts E srrffing. Complete System System Vlicsnni HlanpNEw fa* Srsten ] Visc.u.1 mplifio, la. System ) G",",d Glf**'i SP 25 UHf Mk deck ;A* As Stsiet System l; tl Twa Tw. Ooo Du. Tip* Typ miehid.. llchod spill*)* spllkors-tadmnlinspptujt;' Enclosure size approx.!zr t X 13" U* i.11 HJ- i" Finiikid finished intntvmhi.dri teak veneer. Driye unru units 13" 13* j!" x 8'" km bus dilnr. driver, sad rvra two 3* 3- lip?roi. (approx.) nwinn. tweeters. ZO Win, R.M.S. 8 ohm. frequency ranga-zo Hz HL 20«i!U B-M.s., 6o?n!llianit r ni 10 Hi CM Hi. Complete System 69 &9 00 PRCtS: PRCES: SYSTEM 1 PRCES; PRCES: SYSTEM 2 r ViicocnrfHHlOZ Viscount 111 R10Z Viscount Viicjunl 111 R152 Rl0Z airjrfifibr amplifier [24.20 [Z l [1 p&p p tnyibr amplifier [1 p8 P & p 2Duatjbilipuxj-j 2 Duo Type 11,poake.. C'l.Cfl [t C?.20p6 [2.20 p & p lojotypaffl 2 Duo Type speaksrs speakers C39.C0-f [ ,00p&p 4.00 P & p BamfdSPZSwilk Gamud 25 wilh Map. Mag. cartiidja cartridge Garrard Ga"ard SP 25 Z5 with Mag.cafjidpe cartridge dehiie deluuplinlh plfnih delu," Faxt plir.lh plinth biagid hinged cover [21.00 [Z tl p & p erdhhsedccvef hinged cover C1.7S [1.75 po p & p 1011t: to: AvilliVicpmpletifprDDly: P ftp A.Hlblecompltllfo,oaty: p &p Availablecompltlaforontr: AVHlbtl co.plell fo, ~nty : 63*00 &9 00 -r p b & p / stere5t STERt1*QUALTY SOUND... FORLESSTHAN~20 00 r 211 F( Stereo 21, easy to assemble audio system kit. tjo No soldering required. The unit is finished in white P.V.C. the acrylic top presents an unusually interesting variation on the modem modern deck plinth. ncluile!:- ncludes :-' 1 BSRSsppsddeck,Eiitwnalip,manualfscililiesMueBurwith 3 spud deck, automatic. facilities together with sthm stereo rartridje. cartridge. Two spooktrs speakers wilh cahinsts. cabinets.' Amplifier tnodufe. module. Ready built with co/hfd control panel, panel. speaker leads full, full. easy to 10 follow assembly instractkms. instructions. Specilicaiions: Specifications: For tha the technically minded minded:- nput sensitivily sensitivity 6D0mV. SOOmV. Aux. input sensitivity 120cnV. 120mV. Power output 2.7 watts per channel. Output impedance 8-15 ohms. Stereo headphone socket with automatic speaker cutout. Provisior. Provision for auxitiary auxiliary inpuis inputs - radio, radio. tape, tape. etc.,.. outpuis outputs for taping discs. Overnl! Overall Oimsnsions. Dimensions. Spsakcrs Speakers appro*. approx. SJ'X 151" x a'xa'.cumplaiedatk 8" x 4". Complele deck cover in closed position npprc*. approx. 15f 15t" x 12'x 12" x 6". S". Cgwplate Complete only S p & p. Extras if ifrequired tiqyired,. Oplional Optional Diamond Siy1i 1.37, Styli Specially selectad selected pair of siareo stereo headphones with individual level contrfllsarid controls padded earpieces to give optimum parformancb. 3.85, optimum performance BULD TOUR YOUR OWN* * ~~~ STEREO AMPUHER AMPUFER fur ths man who warns n tfaaign his own starao hara'a your chance lo slart, For tile man who w~nls to design his own stereo - here's your chance to slart, wilh with Unisoumi Unisound - pre-amp, pre amp. power ampliliar amplifier conlrol control pan-l. panel. No sofdarins solderingjust simply screw lopelher. together. 4 walls watts par per channel ima inlo 8 ohms. nputs; nputs: 120inV 120mV joslsimply (for caramic ceramic carrridaa. cartridge). The heart of Uniiound Unisound is is high alliciency efficiency.c. monolilhic monolithic power chips which ensure very low dislonion distortion over the audio specltum, spectrum. 240V. AC only. 7-G4 + 55p. p &p 8 TRACK HOME CARTRDGE PLATER Elepent self seleclor push hutlon player Elegant self selector push button player for use wild with your stereo system, system. Compatible wilh with Viicoun! Viscount'" ll syslem, system, Unisound module the Slateo Stereo 21. Technical specification Mains input. input, 241V. 240V, Outpot Output sensitivity 125wV 125mV Comparable nnit unit sold elaswhere eleswhere at approx. Yours for only 24,00 apptos. Yours lor only pp&p. 240V. AC only. 7,64 +. p & p Dp p & p" 882

17 PUSH BUTON BUTTON CAR RADO KT! The Tourist NO SOLDERNG REQURED! NOW BULD YOUR OWN PUSH BUTTON CAR RADO Easyto assemble construction kit comprising fully completed tested printed circuit board on which no soldering is required. All connections are simple push fit type making for easy assembly. Fine tuning push button mechanism is fully built tested to mate with printed circuit board. Technical specification: (1) Output 4 watts R.M.S. output. For 12 volt operation on negative or positive earth, earth. (2) ntegrated circuit output stage. stage, pre-built three stage F Module! Module: Controls volume manual tuning five pushbuttons pushlbuttons for station selection, selection. illuminated tuning scale coveting covering full, full. medium long wave bs.. Size chassis 7' 7 n wide, wide. 2* 2 n high 4%" 40/.1" deep approx 7.70+bsp pp p»p ftp Speaker including baffle fixing strip p.p&p. p&p. Car Aerial Recommended fully - retractable p. p&p p & P The Tourist Kit For llio the emeiibnced experienced conslmclor constructor f you can cen sotdar solder on a prinrad printed circuit toard board you can build this modal. modei. Same Sama tachnical technical ipacificbiion specification as Tourist 11 PnCB Price 6.60-f" + bopp&p. 55p p & p. EM SPEAKERS AT FANTASTC REDUCTONS 20 WATT SyiUn csniiih of 113' x 8 * fipjxji) tilptiuj wqafer ml! with a 8'x 5" 20 WATT SPEAKER SYSTEM* * S,," con.illl of 13' x 8'"' (.pprox).liplicllwqof.r unit with. 8' x 5' jeppru.} (.ppru.) kid raid ranga rlns. unit ip incorporating corpora tin 5 pin p.rnitic litit tvmif twllller ir tr4 nd treuavit UDUOVlf componenia. c~mponents. Circuit Oiaflram Diagram r Ticlwlcel... llp.clll SpicUjcarlie;..' : Bin B... Unit fjp* Flux if«flslty-10d dentity-loo t, K.lplldl Kneh e»il-li' Con*. c;il-li"". Trip Tripl., To Uralnitid... in, d paptr p.p., with # P.V.C. P.Y.C.lunound. Hid Mid Riagi Ring. Unit Ffca F'u iib«rrp-mk,... ity 33K ipaich,.. coif-l coil-1" * vriih with painiilc p.r itictwll'.r. twhtir. Piwtt POWl' KiadbiB H.odliR 20 win* w.tu R.M.S., jmpedanea imp.danc -8-8 chon, ohm haamaerruhdm fr.,...nc, respon Mi Hz 1o to HL ll.owht OUR PRCE Complst* +9Bppep. 15" 14.A/180 Ban 1S'14A/780 aoitfli»rlgtd unit on rivid lutui BASS di,elst chit>>t. UNT chassis. Sv(t<ior««if Sup.,io. con. eialarnl mat"i,1 b*ndl»l hlndles ap up n 1058 SO wtili w.11 CMS. HMS. Hd nd (i is iramd flllld lo to jm gi'" > i-ooth smooth fragyaactiaioonii, frequency '''POAl'. fliidnanci RUGn.ne' 30 Hr H. hti flul dmiilf dlnllly MttwalU.liapiiliAca Mllw.ls. lmpld.nc:e 11 at khz H 111 is8 ahnr ohms. 3* 3-voic' Twta ml. toil. RKommendfd RCommended rota teil 11(1 pri rict OUR PRCE l f B + t'50p&p 1-50 p & p DSCO AMPLFER Roliant Mk V Mono Anplifiar. ideal tan he small disco or house parties. Reliant Mk V Mono Amplifier. ideal for the small disco or house parties. Outputs 20 watts R.M.S. into 8 ohms (suitshla (suitable (or for 15 otims). ohms). inputs nputs 4 M eiectricaily electrically mixed inputs.*3 inputs. 3 individual mixing conirols. controls..separate 'Separata bass trshla treble conirols controls common lo to all 4 inputs..mixer Mixar amploylng employing f.e.t. F.E.T. (Field Elfact Effect Ttansislotsl Transistors) "Solid Solid Stain State circuitry. Attractixa.Attr~ctive styling. NPUT SENSTVTES -nput-1.) -1.) Crystal mic. guitar or mauing moving coil mic.2 2 lomv. 10mV. (Selector switch lot for desired sensitixity). sensitivity). -nputs-2).3), - 3). 4). Medium output aquipntabt-eeramic equipment - ceramic earlridge. cartridge.tuner. luaor, tape recorder. organs. etc. - all 250mV sensitivity. AC Mains. 240V tape raeordat, organs, etc. - all 250raV sensitivity AC Mains, 24ilV operation.sire operation.sizeapprox:12!"x6"x3!". approx: J'xB'xl}' p. p&p p & p TECHNCAL SPECFCATON: Pre-amp Pte-srap - Output - 2D0mV. 200mV. Auxiliary inputs - 20(lraV 200mV 750mV inln into 1 meg- meg. Micinpul input - SmV 6mV into look. DDK, 240 solt voll opatalion, operation. Turntablesc.p.city 7". 10" 12" DSCO Turnleb las ca pa city - 7M 0* or 12' records. Rumble, Rumble. wow lluttar flutter-- Rumble Rumbla aatter Better than -35da. -35dB. Wow Batter Betterthan than 0, %. CONSOLE Flutter getter Better than O.OBX 0.06% (Gsumontkalea (Gaumont kalee meter). Finish - Satin black mainplata mainplate wilh with black lumtsbls turntable.mat met inlaid wilh brushed altrminium aluminium trim. Tonestm Tonearm controls n in Mark black brushed alumlrlttm. aluminium. WCDRPQHATES: NCORPORA res: Pre-Amp Pre Amp with full mining mixing facilities, ncfuding including switchifl swtched input for lor tntc mic wrth Wth Console alia- siz8- volume control, switched input <of for aoxiliety auxiliary with wilh volume control, control. bass trabfa treble controls, conlrol Unit Clossd-17}*xl3{*x Closed i"x 13i"x 8 ' 8i" (approx.) volume control blend control for turntables. turnlable. Unit Open i"x j*x 13J'x4l"(apfrn«.;. 13i"x 4t"(approx.) Two. B.S.R. single play piofessional professional tariei series decks, lined fitted with wilh crystal cryslal cartridges. This disco console is ideally malchad matched for tha the The lurntablea turntable. are designed precision engineered. They conbine combine clean modern styling Haliant Reliant V Disco 50 or any othar other quality amplifist. amplifier. with superb reproduction, reproduction. Thair Their many ipadal special faslurea features includa include squera square section efumfniuni aluminium finished conlrasting tnnearms, torearms. {high (high ptedalon precision low mass design fully counterfaslenced. counterbalanced. with calibrated stylus The unit is (inistied in black PVC with contresling pressure simulated spun controf control for perfect trdcking), tracking), conveniently grouped easy to read linear conirols. simufatad teak edging diamond spurt control knobs controls. The control Thaturntabla. turntables have viscous cueing c.aing devices device. which alfows allows the hetonaarms lone arms to ba be placed or lifted with matching eonlrol panel. at any point on the record. Tba Thatwo lightweight cartridge shells have slide-in-holdars slide in holders to facilitala fecilitate easy inspectlan inspeclion of Yours for only DO P. &P.& neidlescirtiidgas. needle. cartridges. Mall ordots to Acton. Tarma C.W.O. All biv Radio M qulrles qulries itampad stamped addrasaed addressed anvelope. envelope. Goods en- ]~ R T V C Rsiio TV not despatched oimlde outside U. K. Leaflets avail- Components able for all tems listed thus* * Send etsmoed stamped '- J (Acton) LU. Ltd. iwmgmmm > addressed addresl8d envelope. All tems subject to -si u- l c. i a» j tiro Lur DO NOT SEND CARD availability. Prices correct at 1st Nov c High Street, Acton, London WJ W3 ong 6NG subject to chanve change without notice. 323 r Ed j n R J d L d J sir-) W2 Just mite write your order giving All prices nclude V.A.T. V at 894 8% rate. Sli CdgwarC gware KOad, oa, LORdOn on on Wz your credit card number Personal Shoppers EdgWare Edgware Hoad; Hoad: 93.m.-5.30p.ni. 9a.m.-5.30p.m. Half day Thurs. Acton: 9.30a.in,-5p.rn. 9.30a.m.-5p.m. Closed all a" day Wed

18 TECHNCAL TRANNG in radio television electronics Whether you area a newcomer to radio electronics, or are already engaged in the industry, CS can help you. We can further your technical knowledge provide the specialised training so essential to success, or prepare you for a recognised examination. CS have helped thouss of ambitious men to move up into higher paid jobs-we - can do the same for you.. Take one-of 'of these courses. CTY & GULD CERTFCATES: CERTFCATES:- Telecommunications Technicians Radio, TV Electronics Technicians Electrical nstallations Technicians Electrical nstallation Work Technical Communication Radio Amateur MPT General Radio Communications Cert. DPLOMA COURSES:- Electronic Engineering, Maintenance Radio, TV, Audio Engineering Servicing (inc. Colour TV) Electrical Engineering, nstallations Computer Engineering & Programming New Self-Build Radio Courses QUALFY FOR A NEW CAREER Home study courses for leading professional examinations diploma courses for business technical subjects:- 1 Accountancy Engineering Motor Gft C Administration Farming Personnel G.C.E. Wefce Advertising Heating Purchasing an./s. Air Conditioning industrial ndustrial Sales 60 subjects at '0' anhimevpls 'A' levels Construction Building Marketing Management Secretarial Scorekeeping Storekeeping Catering Mechanical Work Study Catering POST THS COUPON TODAY ~:~;;~;~~~;~~Te7c;~~ To: NTERNATONAL CORRESPONDENCE SCHOOLS \ Dept. 232C, ntertext House, H~use, LONDON 1 SW84UJ or telephone Please send me full details of your courses for:- 1 (State Subject) ' Name Address T EG H Nl CA L 1 11 Al N NC Occupation... Age ~ ~ Accredited by the Council for the Accreditation of Correspondence Colleges Jf~~~TE Mk T SUTOfSTE MkD Electronic gnition""" gnition...,"~) ^ Better on all a points "j{~ : : Because you keep your points! The SPAFXPTE MK.?na Ml caoacillve diict>3>g«electronic *v»fem. Speciltcally deigned :c rtcafci the points aivemy y M ih * ] jke breaker bconco end rone d ehrniiuted o' the CHJtSar.rages elec trcn* a-'iy No by mdlire a pulte tets-se contact. ~~:~~:;S~~~~(~~~le~~:;~';rde!!~~r~;eK:~~,~ luppreinon c>rcuil which prevents the unit Or ~~i~:t~~~e trig it the OVOt bounceocer it high <pm Ccntact brfakei born tdvfhv reducing tie cu"eni ca aboji 1 50^^ al The ~.PARKR~E MK,] S a,full capaciti... e discharge electronic system, Specifically designed 10 telatn he points assembly w ith all the advantages none of The disadvantages. No misfire because contacl polnl5 bounce open 011 high rpm. Contact breaker burn eliminated Hy reducmq the current 10 abou 1/50lh norm, nprm. thus a avoiding borting arcing. jrsing. But Qul you can nill jlill rewr reven to a rorrnoi normal ignition ijnition if f need ne»ci be. rt n seconds. seconds, f if points po nti go very unlikely) can gel replacements anywhere, anyvrfter*. 0 fvt'y uhlikelyl All AM these you 2'dvantagts. pdva"iages u* 9*1 repfacem«nii.fitted Utied in n 15 mmueel. minutes. Up Uo 10 to?0". 2O ~" beller heller fuel consumption coniumpiipc.. A lnslant irt i«oi all «ji weiuher weaihe' staning im'liog.. Cieare Ch~ant plugs they hey las Kt l 5 times timet longer lorger imthtm: without ahen,ion. at tent.cr, e Fasler acceleration. efaster lap speeds. e Pajtcr Col1 Coil jeceleraclon. bacteiy battery lart Patter lastlonger longer. csftc top vtttft. Elliclent c.^i luel fuel hurnlnq With less air pollution..,.;,~~~j...", nrrnitwj ynlh lets air oohulion The kit comprises 1 everything needed Hearfy Ready dnlltd drilled scralch KH-ch ruji rust retiiuni resistant case, case.. m«ia"vvotig. metalwork, cablet, cables. coir COil conneciotj. connoctors. primed printed circuil c«cv<t board. quality 5 guaranteed transformer iraniicrmeraodcomponeait. board, top qufllity S year components. ktf ctja'amerd Kv x ^ full ><. /-w srjv /jg -» «J instructions to POS tive or negative earth imiructiook symem. lomake system, $ 6 pdqe poouveor palje mtlairaiion neganve \ nstallallon J 0 0 > / / JZq mtruciion nstrucliun lead* leallet. t. <-^ 'om;.- WE SAY T S THE,M 8EST BEST SYSTEM ar AT ANY PRCE' > PRCES / 'ms. S"' 0«DY K" untv.10'93 '''l: t vo..!,lflll ps ' H«rx* V K..u-iv Krt3n^ Hedclv Bu,tt U"" 13'S6 n l: t v., T,tntl J So P tbo Both D 8*d ' 0 1,1 all u-.i l3-g5^." dll CjiS C,",' \ will w,", cu.l co,oc! t'ish VAT \ lnhulur liolu' ami R 4 f ' U'" U S ' B BcyKtoie^l - ^ 8cY'ond ~ 1\1 We W~ ( d" ~\jpp V U " " ~ 11)'.nV 1""..,,1 ~""or'et l v,.hlcl" 1t,, '.' mufq-ofl* can twppiv u«mt tu< JOV ro<fl«il vrhklr Mk-Jl m ()1J ' cvc~ ~' c',..., 11'1 l: ul1 (''." \!' ejo,t'. ''lnl'ltj n DcU-'l De'Jlll W«o n mupsi lie 1 wlbcu>t ' \,lue\1 CUM Cdll in t"-1 on anil!.k.n,! irr 1 ll'cmaf \!e us U ~ fur ", a HgOnipo. ilecnijnit'.iti.m oleftlu" ~ tr, ' " m ELECTRONCS DESGN ASSOCATES pep* PW2) PWl) 82 Bath Street, Street. Walsall WS1 WSl 30E 3DE Phore Phone Phoenix Electronics (Portsmouth) Ltd Havant Road, Drayton, Portsmouth, Hants P062AA Full member of AFOEC fhe AFDEC-the industry's association of franchlsed franchised electronic component distributors. Our prices include VAT V at the current rate rate- carriage on all goods is tree. free. Send for our catalogue price list we'll list-we'll mail that to you free, too. COMPONENTS FOR.C. APPLCATONS BY MR. J. B. DANCE SAJ110 SAJll '96 SAJ180 SAJl SAK110/115 SAKll0/ ,23 TAAT7SG TAA715G 1-23 '23 TAA930A T 1-23 '23 TBA790KSD TBA TBA TCA Please send your catalogue free! catalogue-free! Name Address PEP/1A

19 CUSTOM CABNETS, 331 High Street, Rochester, Kent. Tel: Medway (0634) ' Speaker Cahinets Cabinets in kit form represent HUGE SAVNGS 2' x 12'* 12" Cabinet 4'x x 12'Cabinet 12" Disco Console (includes lid not shown) Takes two slaves For a long time now a large number of customers have asked us to produce cabinets in kit form, above we show For a long time now a large number of customers have asked us to produce cabinets in kit form, above we show examples of cabinet styles these are how now available either fully built or in kit form ready for you to produce a professional finish in a very short lime time! Kits are available in all specifications all the kits contain n everything you need as follows:- 1)44 sides with hle cutouts, cutouts. front edges rounded. 1 back with jack socket hole, a 1 baffleboard with speaker cutout 2) P. P.V.C. cut to size for frame back, plus false front back timbers, timbers. while white front piping speaker cloth 3) Recessed hles with fixing screws, jack socket, all fixing screws, corner plates, glue, full instructions! 3) Recessed hles with fixing screws, jack socket, all fixing screws, corner plates, glue, full instructions ( PRCE 8i TYPE LST Type Size Price manu/actured Kit price 2x12" (illustrated above) 36"x18"x13"xi 19,50 12,50 4x12" (illustrated above) 31"x31"x 13"xJ x12" P. A. Column 48" x 27" x 13"x? x18" 31"x31"x13"x x 15" with twotop horn cutouts 36"x-20"x13"x Mini Disco (slate deck cutout BSR, GARRARD etc.) 33"x 20"x 10"* i Max! Disco (illustrated) (state deck cutout BSR, GARRARD etc.) 42"x20"x10"x PRCE & TYPE LST Type Size Price manufactured 2 x 12" (illustrated above) 36" x 18" x 13" x a x 12" (illustrated above) 31" x 31" x 13" x a x 12" P.A. Column 48" x 27" x 13" x ~ x 18" 31 " x 31 " x 13" x a x 15" with twotop horn cutouts 36" x-20" x 13" x ~ Mini Disco (state deck cutout BSR, GARRARD etc.) 33" x 20" x to" x ~ 20.00' Maxi Disco (illustrated) (state deck cutout BSR. GARRARD etc.) 42" x 20" x 10" x -if Please ask for quotation on any other type or size of cabinet you may require. ALL OUR PRCES NCLUDE VAT AND UK DELVERY ALL OUR PRCES NCLUDE VAT AND UK DELVERY Kit price Bw'UJOO[) BVUJDDD 'CHANTCLEER * READ: TME AND ALARM * ELECTRONC 'BEEP' ALARM TONE * TEN MNUTE 'SNOOZE* 'SNOOZE' FEATURE * BRGHT, CLEAR DSPLAY * NO MOVNG PARTS * EXECUTVE STYLNG * SOLD STATE RELABLTY Digital clock The heart of the CHANTCLEER is a tiny electronic COMPLETELY ELECTRONC NO MOVNG PARTS Alarm Has a.m. or p.m. setting with alarm on/off indicator. A gentle electronic 'beep' tone with special snooze feature The heart of the CHANTCLEER is a tiny electronic gentle electronic 'beep' tone with special snooze feature package containing thouss of transistors which divide that resets the alarm for ten-minute intervals. The snooze the 50 cycles/second mains frequency info into precise time s is activated by simply tilting the clock forward then - units. The clock "movement" in fact has no moving parts releasing. Upon cancelling, the alarm can be immediatefy immediately to \0 wear out or tick or tock or hum or click. reset for the same time next day. B~rnDD[) BYWOOD ELECTRONCS. p.u» i innn bvwo Ebberns Road RECOMMENDED + VAT i H B J Hemel Hempsfead Hempstead PRCE 1995 Herts, Herts. HPS HP3 9RD.. Tel %157 Tel

20 886 LSTEN TO ^CR70A THE WORLD! P.R.40* 10'931 _ / VAT PAD *MAD! MADE CARR. 32p TO ^ ' R.F. PRESELECTOR ORDER A The PM0 PR040 R.F, R.F. Pretalactor Presel.etor is the solid.olid atate ttate version of o( the world famous '.mou PR30 Pfl ! 37'151 t employe which employ. Silicon it now **N" supersedes. "N" Channel F T FET (Field Effect EHect Transistor) Transistor} front end followed by silicon NPN Broad B R.F. Amp., will subscancially substantially improve VAT PAD ranre 1' 5 MHz. providin. COMMUNCATON RECEVER RECEVEJ C^r CARR. 8Sp B? p Tncreass receiver performance ~~i~~:t:n in i~n~a~~i~: fain up,.~~j:.n to over an the overalf range overal avcrago i -5 to 35 avera,e of MHc, of 31MB, providinc lods, with with {mproved a considerable improved mage rejection tnd noise ratio. ima,e The CODAR CRJOA CR70A it is an oucjtinj outsting jcneral,eneral coverage covera,e communication Supplied co ax piu,.t.."dud volt 11 receiver, months.. receiver. ideal for the keen S.W.L menthi Guarantee complete. with. - co.ax plug (less stard 9 vplt PP6 Battery)..L. k t tones tunes from 540 S~O metres medium throuth throu,h to 10 metres with no <aps.,aps. Covers shfppinf, shippin" coastguard distress frequencies, atl all six amateur hs bs metres, metres. nternational broadcast, broadcast. Met. stations etc. etc. MULTBAND-6* MULTBAND-6^ fivlng,ivin, world-wide reception. Exclusive features include Air-ipaced Air.spaced CODAR-COL CODAR COL Hi."Q" Aerial input, input. tlluminzted illuminated Meter Slide SHORT WAVE RECEVER KT Rule Scale, Scale. Two Speed vernier tuning. tunin,. Switched B.F.O. for CW/SSB CW/SS8 signals. Separate output for Tape recorder. Read/ 16'90! CARR. ~3p Ready to plug m in to 200/ /2~0 volts A.C. it only needs your aerial a 16-90! CA 43p 2/3 ohm loudspeaker pc«cr so to urmg bring sne the wcr.o world to your.mger finger fin,er tips. 12 months montns All transistor T.~. F. Receiver tunes 550 KH% to 30 MH:t (540 to full 10 metres) guarantee. Ar uanlucgr R eee i lime, SS0 KHi to 30 MHt (540 to fo metres),uarantee. complete coverage no covera,e-no gap*.,aps. Medium waves Trawlers Ship wave5-trawlers-ship / 1 Shore Tel*phono A Telephone-All Six Amateur Bi Bs metrei nternitlonal metres-nternational Broadcast * MPORTANT NOTE from (rom Australia, Far East, East. Russia. Russia, USA etc. using usin, 4 miniature plug piu, n in ColU. Coils. T. Recen. Det./AFAF Module civin, This Jhis. fine receiver s t is not 1 a mass produced... item, buc. but each... sec set ti is h any Hi-Gain external FET Regen. 2/3 213 ohm Det./AF/AF speaker. Receives Modulo giving AM/CW/SSB. full loudspeaker output to AMCWSSB. bulk built to your order, order. individually checked air tested. Please.. e allow Separate Electrical Bipread, Bspread. Calibrated Main Tuning, Tunin,. for this When when ordering your ordering-your delivery date will be b. shown on your A Quality CODAR-KT CODAR KT with 12 months Guarantee. No technical knowledge knowtedle receipt, receipt. sent by return. ffly'd f~11~id!~~ii!~~~~:ob:~~~p t f'dt 0 b '. printed crcuit circuit Pictorial mtructlan nstruction Manual. Complete Kit with with" "» Coils (lets ( ell stard PP6 battery). LLUSTRATED L.LUSTRATED LEAFLETS FREE ON REQUEST ON THE DESGN DESGN STAff STAFF- C a DA KB A ^ r0 \j\ TO COPE WTH incsfaslnc NCRf.ASNG DlMAND-ntAX DE.MAND - PLEASE G3SZM ClSZH Ol Cll"E RE VV NOTE. SALES OFFCE TfL «ON-rHUn5-J. NEW SAiES MON THURS.9.30 j0 Office a.m.-f.30 JO TEE p.. No. 0J-7J-T83<5 p.m. ms ^ VALCON WORKS, BURRELL BULDNGS CHURCHLL NDUSTRAL ESTATE. UNCNG LANCNG, SUSSEX WORLD-WDE WORLD WDEMAL MAL ORDER EXPORT ORDER-EXPORTQUOTESFREE.BNS QUOTES FREE. BN15-8TZ - uerabah uerobok ALUMNUM ENCLOSURES 6 stard sizes avallbblo from your local retailer, t Made from precision extrusions with integral board guide slots. ^ Finned sides improve appearance radiate heat. Parallel sides for ease of component mounting. P VERO ELECTRONCS LTD. Eastleigh. Hants, SOB 3Zft Tet: Chler's Ford 2952 Telex: Subsidiaries Agents throughout tho World : TELEVSON : CAMERA : KTS Complete kits are available (or for both "Mullard" UMullard U "P.E." UP.E." desion. design. Each kit ncludes includes a contprehen- comprehen sive construction manual, manual. a fitting completely FREE technical back up service to ensure your success. VHF UHF Modula- Modula tor Kits also available to allow stard domestic T.V. to be used as monitor. AM All pads parts available separately, separately. ncluding a wtde wide range of lenses, lenses. vldicon vidlcon tubes, special special mains transformers focus/scan coll coil assemblies, assemblies. ready built cameras also available. Complete kits also available P.W. tele-tennis tele tennis game. Send 5"* x 7" S.A.E. for full details or come along for a demon- demon stration a chat with our technical staff. GROFTONELECTRONCS CROFTON ELECTRONCS: 124 Colne Road. Twfekenham, Twickenham, Middlesex, TWZ TW2 6QS 8QS Tel: Telex 934E Cadanac LDN i 7RANS/9TOR QUfPM NT RCZf RECORDER TOUE FROM T8AS5ST0R 10DR CAR RADO BATTEEY OR CABSETTK LSifoQir to UluHHtlon! Thin no t enables you. - to rsd yoar casaelte This unit. enablea you to run your ca.b8ette tape car TThl]«l recorder wbilst tnwelling. from the travelling. t. eaauy ltt.d comes complete with instructions. Plcaee Please l*tc state make cl of ca8bette, voltage type of plug required. cuide'-lc, Toltaga xnd xn typcof plug reqajred. " ONLY '86 EDS RU! TOtTB YOUR TAPE RECORDER OPP 01'1' AO MA1F9 la1l Alalss piece unit reivly lupplled to ccta- nto your caueite ttcorder. p^og S laic Tollagc, make SSjnl _ 1 Mains unit supplied complde a.nd ready to plug into your cassette recorder. (State yollage. make plug required. if in doubt type of plus eend required, send diagntm 1' n diagram of recorder socket.) recorder locket-) ONLY '40 ROT YOUR TEAKSSTOR RADO OFF AC KAH3 RU! YOUR TRASSTOR RADO OFF AC llals For single outpale, outputs. 6v, 6v. fiv 9v For two separate outputs. 6v + 6v, For two eepurare ootputa, 6v + flr. 9v 9", + 9v per cnlt. unit. (Pleaaa (Please All unlla arc alale completely oatpau reqalrrd.) loolatcd from mine by state outputs requjred.) All unlu are completely solated from m!llfll by double wound raneformer transformer eusurlog en8urjng 100% oafety. eafety. All Brilikh Brllah Had*. od All Frlco Prl"" tso. DO. T^.T. V.A.T. isi add P. & ok t. P. R.C.S. PRODUCTS (RADO) LTD. fcknt. (De~t. PWJ) 31 Oliver Road, Walthamstow, London, Ei7 E7 Full refund if not c()mplerel".cjllqkd Full refund f not ot>mptrlrlf lalf/fied.

21 1 ELEGTROVALUE APPONTED STOCKSTS FOR SEMENS QUALTY PRODUCTS top quality electronic ^-^comoonents for price-minded buyers 112 p. CATALOGUE ' FREE POSTAGE (U.K.) ATTRACTVE DSCOUMTS ' SPECS. GUARAHTEED A TO OF THE BEST A 100 OF THE BEST From our transistor stock 2N p BC149C RESSTORS ELECTROLYTC CAPACTORS Up Axial Laad Load 2N264B 51p BC15BB 15p Code Watts Ohms up qf 3V 6-3V 6' 10V 16V 25V 40V 63V 100V loov 7N2646 Sip BCMB 2N p BC1S9 Code VTatfs Ohms ffo9 10 to up qf 3V BC159 Up (sea (see note below) ' - p p 2N305* 2N3054 lop BC1S7B 13p 1' 3,., 0 ' nett 1' 0 - Up - p 2N p Wp BC1MB BC167B BC1S8B Up 1/3 4'7-470K rteri Up 8p lip - 'p 2N3702 lip BCWB BC169B Up M 1 3,., 0, nett p 9p Bp 2N3703 lop BC165C 1/2-13 t'l 0-9 netl 2-2 _ _ _ 1lp 11p p Bp ip 4-7 BC169C 12p M 1' 5 1 '2 0,,7 nett - p p p p EN3704 2N3704 tp lip 8C75B 3/ OM netl 10 lip ap ap ip op bp bp ip BC179B 26p - - 'p p p ZN3705 2N3705 lop 8C182L BC182L 12p C OM 4' 7-10M 33'2 2 22' nett 22 Bp 9p Bp Bp lop 47»l p - p Bp Bp lop Up 2N3794 lip BC184L 12p 1001M 3' 2 3 nett Bp 8p ap lop 12p 19p ZNMfl 2N381t Mp p BC212L MO 1/2 1&-1M naif Bp Bp 9p 8p Bp 9p 8p 10p 8p Up t2p Hp Hp 12p WW 0' 22-3'90 p ap nett 'p lop lop lip 17p 2N4W2 2N4062 lip SC214L BC214L Up ww B rett 220 <,p lop lop lip 13p 24p Up 2N44M 2N«43 fl3p '3p ac257a BC257A Up ww WW a 3 l-hk 1-10K B & nett lip ZOp 25p 2NM62 2N p Up ac2ss8 9 B 6 netl 470»l Hp Bp Hp ap Hp 11p Hp Hp 17p Up Wp Hp 45p Zip 1, p 13p 17p 20p 2Sp 41p BC259B Up WW 2,200 15p lip 2&p 37p 41p 2NS163 2N p 8CYS8 BCY5S lop ww K nett 15P 1«[> Up Mp "P «lp 4,700 M0 Zp 30 30p p 33B 39p "P «p Mb Sp 2N5<59 2N p 3Zp BD130 B0130 top Codes: 10,000 42p 4&p !p Up 8D131 B013t 4p ~ h low p BOt32 = metal oxide. flectrosll TRS low noise p p 41p BD135 BD132 52p C carbon film, high stability, lov^ noise. B0135 MNTRON WW = '36 SD136 37p MO ww - - melol wire onlde. wound, Electrosll Plessey. TH5 ultra law nolle. H1N1TRON DGTAL NDCATORS 1015F B p 3015F Seven eecmcnt segment filament fllament competiole compatible With with stard 1 10 modules. characters BDY20 BOY20 a3p Valuo.: All Et2 except C tw, logic moduleb. 0-9 decimal point: 9mm chsracters n C ~W MO tw. AC AC p Up BF194 15p 16 E12: 10, 12, S, 18, 22, 27, 33, 39, 47, 56, 68, 82 their 161ead lead DL OL '" ZO AC151R Mp 23p BFR39 n Z7p BFR & & AC153 E24: E12 t, 13, 24, 30,36,43,, 62,75, 91 pt. ' ZO AC153K 27p 17 37p BFR7fl BFX29,23p 23p 24: decades. as 12 plus 11, , , 36, r Ml5G Suitable showing-l BCD decoder or 41 driver 4 dec pi. 1-Z9 y H 33p decades. LEDS Emlltlng Diodes). 25p AC AC Z4p p BFXB4 3Jp their dncfldes. LEPS (Light Emitting Dlgdas) Kp BFX84 27p Photo Calls Cells Cahmlum Cabmlum SolphauUde, Sulphsullde. each 40p AC17flK AC176K Up 23p Tolerance.: AC1B7K 3lp AC187K 31 BFY51 31p P 8RY39 BRY39 50p 5% except WW 10% ± o osn below10n t W MO 2%. ANTEX Soldering rons ACGSK AC188K BY64 51p Prices n each for quantltle. of the CN240,25 3Zp AD133 ADt33 1' 29p ' S2 92 C106B1 BY164 Cl06Bl Up are pence CNZ Spare bit# Wp Z ' 76 41p A013S A0136 M1 1," COGD CCN240 2'7fl Spare bits *Bp Cl p same ohmic value power ratlno. NOT mixed AD149 A0149 SZp 52p C406 C p values. (_gnore fractions of one penny on total value of A A g 42p MJ431 DESOLDER MJ481 1 ' 20 BRAD A0162 resistor order). Prices for 100 up n units of 100 only AD p COp Mvl491 MJ491 1 '35 6 ft t atrip strip 7flp 7tp AF20CU AF200U 40p MJ2955 lop WAVECHANGE WAVECHAHGE SWTCHES AF539 "FU9 lop B9p 6 B1M6 B906 36p Ms> MJE371 MJE52t MJE521 p POTENTOMETERS CAPACTORS idc 1 pole 12 way; 2 pole 8 way pole. Up 3A\38.BA138 Hp 31p MJE ROTARY, ROTARY. CARBON TRACK. DALY ELECTROLYTC SLYTC n. cans, - TAG 3 TAG STRP 4 way; STRP 28 4 pole 26 way 3 way each Wp way 11» 11p BB103 Up wipers for contact plastic sleeved BBTOS 24p BB105 Wp 34p OA9 MJE3055 Double wlptrs far good conhct OA91 6p etc. long working life looomf/25v 21p ' 5& BB09 BBf09 4Sp cap SD4 hng wotung lift 1000mf/2SV pbslic sleeted 2Bp 2200/ / S04 p 5000/WO 5000/ et 1000/50 41P 41p p n NUTS, lots of 100 SCREWS, each etc, ec107a BC107A Up rip3ta TP3tA 70p P,20 P.20 4' 7 5OOO/25V 2p 2ooo/5057p 6B" 30p BC107B BCt07B tap 18p TP32A lop megohms. SNGLE linear 100 ohms each to 4p 4-7 SOOO/2SV 62p 2000/50 14p 5000/50 S7p p 4BA NUTS 34p: 6BA NUTS 10p 1'11 t ll.b Screws 21p: i" 6BA ~ews 8Ct08B BC08B 18 lip p TP41A lop StNGLE 4 7 2'2 C.210. Radial j.ll BC1O0C BC108C 4p TP42A P.20 SNGLE log. 4-7 Kohms to 2-2 POLYESTER TYPE CJ80. ffarf/a/ Threaded 1"4B Screw* pillars lip:y 6BA, 8BA " Screws hexagonal 24p 1 00 Up P.C.B. mounting.. 40 ecioaa BCf09B Up W02 megohms, each t4p leads lop voltage d.e.. i" 1-1Z BCV09C BC109C lip ZTX300 Up JP.20 DUAL GANG fn. n Kahms railage for 250V P,C3. d.c. maufillng. Working Plain spacers ground Kohms 0'01,0'015,0'022,0'033,0' 047, sizes BC147A 12p ZTX3M ZTX304 Zlp lo to megohms, megohms. each 4ap , 0 022, , ea. 3p i Other sieve available Up 0' 068, 0'1, 0' BC147B Up 13p ZTX50O ZTX500 14p JP.2O log, 4 7 Kohms 0 22 Sp; 0' 0 47 p; 0 68 lip; BC140B BCf.48B 12p Zp ZTX504 JP.20 DUAL GANG loo. 4-7 Kohma p; p; 0-47 Bp; 0-68 ea. Hp; 4p ENAMEL COPPER 45p lo to 2-22 megohms, each ifp cap 1'0 1-0H14p; P ;l'6zlp:2-2z4p 1'5 21p; p WRE in 2 ounce reels 1000 im MORE N CATALOGUE 7 JP.20 JP.H DUAL GANG Loo/anllfog Log/antJlog 10K, SLVERED MCA. Working volfege vo/lage 16,,5. 18, 20, 22 SWG 34p 3<B 22K, 47K. 47K, 1 mbbohm megohm only, onty, each 4ap 41p 500V 26, 28, COp BAXANDALL SPEAKER KT JP.20 DUAL GANG anlllog 10K only Values d.c. n pfo 2-2 to 820 n 32 stages 24, 2S, SWG 43p onty Valueo tn pfs-2' 2 to 820 in 32 'i:::~ 32'34 C6CP:ONNECT360' 38'S40 54p As deslprkd designed by P. J, J. Baxall 48p ea. Bp B: 36, 3a, 40 MB Up 1000,1500 7p; 1800 ip; p; 22M p: lop; 2700, D DN N CONNECTORS R dascrihnd described originally n in "Wireless Wortd.'* World," 22A A OP DP mains switch tor for any of above Hp: Up; , p: 1Sp; Qp;, Socket Plug fop ; loudspeaker f.o;ket f4~g Simple to asaemble. assemble, fantasucatly fantastically onod good 14p extra. 8200, ,000 Wp 25p 3 10p Up results a grealer greater money saver, saver. Carries Decades of 10,22 47 only available TANTALUM BEAD Swoyaudlo 1 way toudapeaker Hp Hp Hp Hp 180 Up 15p 10 watts waits RMS,, 15 ohms mpedance. Size Jn in ranges above. 0 1, 0-22, 0*47, 1-0 mf/35v. 1-5f20V. S way audio 160 Hp Hp ' ~ : 5~;~~ 0'47, 1 0 mf/35v, 1~~.2~:p Up Up 181n 18ln x 121n x 10 n. Complete kit, ndudinij including Skeleton Carbon Presets, Type PR. 3-5/16V ea,14p PR, 2'2/16V, 2' 2135V, 4' 7/16V, 10/6.3V way audio Up 15p pack-flat pacv-flat cabinet, horlzonlal horizontal or vertical vertlcel 6p each, 2-2/1BV. Z'2/35V. 4-7/16V. H/6-3V 6 5 way way audio audio 240 Hp Hp 15p Sp each. a. Up 14b EV CATALOGUE 7 The alxe size weight of olthls this product obliees obliges 4-7/35V, 4'7/35V, 10/1GV, 10/16V, 22/6-3V 22/6'3V ea. Hp lip Znd 2nd prlntlrib Oraan p,lntlng-g,een yellow us lo to charge charee Top 70p part coal co.t of 01 carr. n U.K. SLlDER SLDER 10/25V, 22/16 22/16V, V. 27/6-3 3V, V. 100/3V. loo/3v, Cove, Covar y el low Equaliser Assembly. Assembly, 2-80, %-60. Linear or log mono <-7K 4' to lo 1 meg, meg. fr> 8-8/25V. 15/25V aa. 20p 112 peg ea, thouse of Memt: n ~:/~~VCl~:.s~NAT ea. Hp M~,tra~poe~~; J~:gUr:~::S m:~h ~:~~ i Loudspeaker Unit 59PM RM109, 2-85, all nil popular values aach each 30p 3Gp Type POLYCARBONATE B425ao Working Vortege 250V Voltage-250V technical utlrations; nformation. diagramb; much The usalul 2nd Cabinet Kit (to Baxall design), 14-80, -80. STEREO. STEREO, malched matched tracks, tracks. lln. n. or log Cross-ovar Cross-over choke lor for addillonal additional woofer to in n alt all popular valuot values from 4-7K "-7K to ' ; ; ; 0 ' 01; prices. t COlts above. above, 1 ' meg.. Wp 0 Values 0047; n-mf: ; ; 0-01: 0-012; printing has been updated as much SOp ea_ 25p free refund plates. black. white 0'018; 0'022; ; 0-033; 0' 039 ; fgoorod2~pllfsotrvasrue;~5ngorw!~~e.orderlng DSCOUNTS Escutcheon plales, mono, black, while 0-018: ; 0-027; 0 033; Q-039; ea.3p S5p as possible post tree ncluding on pflcea. relund coats voucher only 10p C~Ra.17~~C05:i1l~S: i 0-082; 0 1 ea.4p :;'~~~~bl~h~~""s~~~~ Available on all tems or light grey, each Hp 0-047: 0-056:0-088; ; 0'1 ea.4p tor except hosa shown Control Conlrol knobs, blk/whl/red/yet/grof 1 CERAMC PLATE goods 2Sp list for value apendlng 5 or when more. ordering blk/wht/red/yel/grn/ with wllh NETT PRCES PRtCES blue/dk. bfueldk. grey/t. grey/lt. grey, each 7p " Working vollage 50V. d.c. QUALTY tn26valuesfrom22pft06800pf,ee.zp n26 value from22d to CSOOpF, eo. Zp GUARANTEE 10% on ordere from 5 10% on orders from 51~~;;;;~.~~;:~;;:~;;;;;Pi~;;i~;-;:::-::::::;:;:~:~::' All goods are sold on the ~~de~~19:. lo orders 14-99, VS nj5::er. 15% over, on All goods are sold on the o n All A " postal 305 ' 3 ' communications, mail orders ifder*; ;:,nr~rst~~dln::,~hna~l~hc~~~:'~; FREE 33H gb 3 U ' 'M Bill e etc. * c ' to ' 0 Head H ea( Office at Egham address, address.. undersllrg that they cohiressi form specifications lo manufacturers speclflcatjons.alloloc- satlafac- POSTAGE Dept. PW.12, S.A.E. with enquiries is f0_ re- tlon Oept. PW.12. S.A.E. with enquiries re- ~~~~je~:'.~~~~~:~d~~ ~~~~b. n U.K. for pre-pald quiring quiring answers. no rejects.'seconds'or s guaranteed as such aubstard alard merchise 18 t mall orders. For mail mall ROAD. EGHAM, oflered lor orders for 2 list value 28. ST. JUDES ROAD, ENGLEFELD GREEN, EGHAM. SURREY TW20 OHB offered under there s is an Telephone Egham 3603 Telex Shop hours 9-5, daily: daily; Sat. 9-1 p.m_ p.m. Prices for sale. ~~tt. V.A.T. quoled 1~~t~:;: lor which do 8% :%' not :.;lr't: must nclude be additional eddltlanal hling of 10p_ 1 ~~~:1. 10 charge ohop. Overseas NORTHERN BRANCH: 680, Burnage Lane, Burnage, Manchester M19 NA. 1MO 1 n added (Xdef, Every ft> tola O:~;11s effort netl s v;,~':. nfue made rt to of orders - carriage carrlago char char- Telephone (061) Shop hours daily: Sat. 9-1 p.m, p.m. ensure the correctness o( of Qed ged at cost. cosl. Glr. Giro A/C No. U.S.A. CUSTOMERS are invited nvited to contact ELECTROVALUE AMERCA. AMERCA, P r P.O. time /nfor of mat going on to press. prices Prices at al 31/871 18/671/4802 /4002 Box , Swarthmore PA subject nol/ct. lo alteration wlihoul 887

22 The largest selection BB H-F ACCESSORES EX COMPUTER BOARDS R R H Twrfced racked wub with tradal.ton, dlclet, ~le", ctpftcuura T'S NEW capacitor. nd rcnulor* COMPONRNT re81.. to",-co~lronest VA-WKU'40. VALU": 11-'0.. ~ l or ONLY 6p De Luxe..va ArAftu-Ulaon slot only Wp + p Groov.Kleen... *'" P p 30p 0 * LuXo Groov-Kleen T'S POWERFUL JPBCTAL PCCAL Oho One ** alt *hvvctlv& above l'j~u8 Vewtr'Ttati- Power'l'rall Mod«Model *95,F~====l~-..lou i.ton CSL* ONLY a, Hp.«!. each + P pap i p 15p lip Chroma Chrome Finish Finish ( w 15w R.M.S.).S.l AND AND- "SC. PAl1:0LlE BOARD, 71 x 0" appr"'. K 'orlo, + fstlop!' ModellG 50 rc:;;;- 1"'111.1 p..t p20p. ' 60 1S0 ^ T LOOKS GOOD! THE FBRE.GLASS FBRE-GLASS PRNTED Rer. n StylUH &: TunlhalJh: Clcallillg atp Jtd. 4ti. ~!Jirit cn J 82p CRCUT BOARDS Bef. JJ fltjlu* a Tumtabh; Cleaning Ktc Mp Ucf. -is. tffddt k-vrl 8Sp LEGONARE Rei. Record/8trlus C1eanlni lp Rd. P. J Fi Cleaner lip loi 14t x 4" kpproc- approx. 2 tor for Mp Kef. 36A. Reccid/SljrlOA Clranlog Kit W Ret. P. HJ-Fi tleanef 81 p LEGJONARE. lip Rel. Rei. 43. Record Core Ca,. Kll Kit Rd. Ref, 3?A. 32A. Btyluji Bcjuj Strlua Balasca Baianca Balance i 1-37 n'37 STEREO i DECON.DALO Rd. 31. ea...tt. Head C.an.r 68, Uet. J. Head Cltanlng U, -~ DECON-DALO 33PC Marker Hf f. 31. Caw tie Head Cleaner B8p Rtf. Ref-?- 3. Tape Hf*d He«d Clean!; Cieanicg Kit Mp AMPLFER -Stjaavv:^ Ktch t:tch rcmflmnt 'ulfltant prjnloij llrlnte.l «lfcuk circuit iniaer llarker pen J Rd. <r Tape Kl ~dltlnl Kit t^ Ref. Rrf. 66. li6. Jft-F H Fi Btereo Stereo Hints Hlnh &&: TJpa Tips 42p 42, Hp each Model 9. t. Wire fitripper/culter Stripper/Cutter 81 88p p Xef. Rer Auto cbangcr groove groo\-e cleutcr cleaner fl ! ORDER NOW- NOW ~~ VEROBOARDS ANTEX SOLDERNG RONS PLUGS AND SOCKETS ONLY p & p P 50p. Pack* '.clu cootalolnr' approx.,!ioltq. n... nl.rillus X2~. 25 ".tt Or pjm. _u., all contalnlns rnatric approi., matrlc BSj ii»- rarlnos XM. 26 wall 12 OA PLUGS Of write for full details 66, CtJX CX:!'f wall 2 &-U 4S pa P8 i D..K. 2 FlQ {S (SllcRk"r) exkerj 0-U 0 11 P8 D.N REPANCO CHOKES & COLS Model o. 18 watt 1226 pa 2 D..N. 3 Pin Oil Model O tt U '28 P8 D..N. " o n 11F HF Choke* Chokes SK2. Soldering Suldering: Kit F9 3 O..N. 4 Pin 018 P8 D..N. G UWO "H. 2'501H 28, Cll~. 6 0rnU aop 81.'ANDS: 8'1'3, Suitable for mutlclfl "'H. 1'8 D..N 'irn. 7'SmU X-SDK alp Z8p an. OH2. fi 10niH Omfi 83p 30p STANUa: ST3, BuJUble tor all uhklctx XX P3 4 P..K. 6 P a 18U- C18 WORLD SCOOP pa 5 D.l.N, D Pin 24ft* 6 26 JUMBO 4'11:'. i :SmU ~~rr5 CHS., i-smn 1 ' ~:\t:~l{ 28p 33p aoujsn: SOLDER: isawa 18SWG MuUicote ~[uucor~ 7oi 70% im l n pa «UJ.K. D..N.6 6 Pin ;umbo 'OLW c'01l.8 J2SWO 228WO 7ot 70z ' wn 18SWO 72ft 22ft Up 61p P8 7 8,1-N. S..N. 7 Pin Piu 0' SEMCONDUCTOR PACK OKX1 U\Xl C'rjeUl CrY8tal.t:t Brttlp 11, DKHtl DRR'.! Pual Dual ruuge ruugt' 46p tip ZlraWfl 2~SW(} Tube 83p a3, 1'8 pa 8 Jack 32 l5mm Bmm bctcetir.l Scrt:eJl:'o Trallsl:ottora TranjMori Uf:Tll. aut Rlllcon Rect(ftr.n pa PS a g Jack 3-5iiim 3 6mOl Plaallc Plastic fllvdev ViuJe!l - Trlars - Genii, Trlll(,s - Thrrisl.in stnl SDtcoo Thyristflra - Reellfler*. t.c>.c ~ alld 7.ent:rs ;\L. NEW A!'\LJ CODJ-:D. COL FORMERS & CORES P810 J'ack 3 6mtu Bcrcent, SOB31AN' SORMA!'i J* 1" Coree Curell A & Ponnera. Ofllleu 8p ANTEX BTS ELEMENTS Pa io Jack 3 6n>ni Bcrcenfl cnrr» ALT. XEW AND GODKD. pa 1'811 n.jack i" t " Plasllc Pia:!tic " " Core* Coru A &i: Fornien» Furmen lop 01J APPROX 100 PECES Bit. nttd No. pa P812 y2 l" i" Screened Otrt:ring tbe alllat~ur falltafltie bargain Palt mootl CN2'(0 3/3'.!" P813 8tereo Scretnt d 0 88 alul1'1ll ellormou!lo!l3\'lng. ilh'uun('ation,1 SWTCHES 102 For model CS240 42p PS 13 Jack Btereo Bcrecnol 036 anil OlTcring a.i ciionimus the amateae raving a taataatle - Mi-nUHcatlon banrxlfi an-l PaL J)P/DT TOO. asp Tnggle aop CN2",0 3/10" P rtata ~h... n e, t:ry Pak. >P/nT Tflpfk 88p HP/ST T»»r«1b 80p 104 For'reodel CN243 S/S" 42p PS 14 Phono 6-1C rt4l» ahret in every Fak. P8U 0 ' For model CX3S240 CCN240 S/W* a/s2" 429 PS 35 Car Aerial &22 Only tl E2 p. i &. P. p. 20p P816 Co.":!ial 0 11 FUSES 1101 For model CCN'240 CCN240 a/a- 8W 42? F8 30 Co-Axial 018 STORAGE! J" UOinni. HH>liiA, JOUMA. ysouia. a~h~ll,' J J 1~J~~;A, l~~.", ~!OUluA. :!nol:\. Ji}~ Jo'or (..'CS2",0!" llle MJKA, 1A. SA, 2A 11 "13 For model CCS240 J" 42? Tin KE SOCKETS RECORD STORAGE/ P821 D..S. (Slt~ 3L;t'-n 0-11 iiujck'jm.oav ~11CK. nlow 6p 6, ca- ra For }"'or rue-del ulotlel r,240 G240 3/32" 4Sp PB 21 P.1A*. 2 PQ Bjwakfrr 014 CARRY CASES 7" t;1'. Ht:".'( ';" x (50 T t:~utlb) n'10 P822 D..N. 0'20 ; ; O:! 1071 l For Jo"or model mod~1 < f8" 42? PB 77 DJ.N, 3 Pin 0 20 V '..!" 1.1'. Ut" x i:" x l!! l ". (50 records) d '" P823 D..N. 5 J80 EARPHONES 10"2 G2~0 3/10" :~:: ~:~ i : ~:::~:: ~:~: :=: 0 0'20 EARPHOflES 1072 For model C540 J/HT 42p pa 23 DXN. Pin 86* 0-20 S" Kl'..E. K!" JJ'"* r- t:~i K 8". vl", 150 (W.mini.) rccotil.l U le-lo 05 P824 D..N. 5 PJn 2", 'rjratal pluv 42? PS 24 D..S. 6 Pin 24&" 623 CryaUl a-flrmu plu? 42p 00 For model X23 3/32" 48? " 0 X25 3/32" P8 P Jack lack 2*flmm 2'5rnm PJaal!.- Plaatk 0 n8 28 CASSETTE CASES l oltlll ~. ~ 31" ': f". r.ot k llan(\le. ^!l ulmia (hlll" 2*5iuiii plug sltug 28p 22p 51 For model X23 X2G J/S" ] /8 46p PS H P Jack 3-Smm 3'5rnm PUall.- Pla!tk 018 H51.. S. 10" t 3J- 5- Un-k k , ne <, nhm* uhm!l 3 S'6rnru Slain plux plug Z2p p 62 ti~ For }~or model X73 X~ii a/k" 3/lti" 4Rp PS 27 Jack t" tit PUatlc Plastic «l 0 P828 t" 8cr~enell 0-35 DYNAMC SPECAL MCROPHONES '-EM KM T0 pa 2S Jack fflcreened 0 34 EU:ME!'iT8 PB P Jack Blereu Flaalh Plastk 636 SPEC/At PURCHASE 0-30 >112*23. 11[22 '2011 ~OO ohms OhlllK plus piu! on/ofl on/on Ewllch Kwitch ond nud KCN }o;cn KCCM ECCS 240 '.!40 X,1'32 32 PS P Jack Stereo Bcrcm- Scrtf'n,.1 6M SS ~llcon Tranflj"tor. NP.s. V 'Hinl1n Smiu amj autl 3-finini 3' p U(f» ~lulc~» U 85 }~v EX ~GHe P881 Pbono 8creenrtl 0-18 F311l0lU (JQl11factU'Te r :ot unt uf "pec de\'lcel EG X 76 «X W PS 51 Phono 8creenr>l 028 Famssj mannfacturer* HHteon Power c-urtj-rper Tnnri-lors Oeckei KPN. frre from 0f't~ 1l. ~ HJ r t dt:(t ds enry on" PS 1' Car Aerial 022 free frojii open abort defcrt- -every nns 0 22 ahlel :;w. TO:!. ~fctlll ('ase. J-WAY 3 WAY STEREO HEAD- HEAD P833 CO-Axial p OUR 8 lor.1 PHONE JUNCTON BOX ANTEX HEAT SNKS lop PB 33 Co-Axial C 22 able! *isw. TOH.MeUli'Rve. ODR SPECAL PRCE 6 lar SOCKETS " CKET V.A.T. neludad nclud.d in n all a.. pricaa. prlc Plaaaa Pi FS 1"S 35 D..S. D.l.N. 2 Pin Opeaken (Speaker LOW COST CAPACTORS add lop P. A & P. (U.K. only). Ovarasas 0... P9 1' DXS. D..N. 3 Fin 61X 0 11 (J~" 400\', Z-WAY 2 WAY CROSSOVER oidara pfaaaa a". "ob ord.fa-pl... add extra lor tor pofttag?. poatag PS 37 D..K- n..n. 5 :; Pin Phi 1«0» UOo G o n 11 6HKPMr.Eler(. OFF 4fl0v. 500~F 50,'. Elect. 10? Sp, ateb 10D aafib eaob NETWORK PS :rs 38 D..N, D..N. & 5 Pin Piu 240 2"' K ~t MO ubiii. Ublll:otllllll. limi. n-^rl (u:otr.rtlnn nn lo... J)~!'t 30 ::dh NEW COMPONENT PAK FS PS Jack 2 ~ 6mm ' 5mm Ealtchfl 8witcbe, S JACk. 3'5null Switchf! ll 0 12 REPANCOTRANSFORMERS BARGANS. P9 40 Jack 3-Gmn: Bwitchr.l 0 22 Jack. i'" Switched 0 20 :!40,. Rf'cunlln.ry ""tk~e" aull.bl~ CAR STEREO SPEAKERS Pack,.'"~ p',1) 3 85 pet lair. 4~ Btereo S"'itehcol 0 30 frum "t"~ct'!l l t ap,ilkj;i "", 7\', th', 10,, UT, Anrl-'U f3-85 *., yi.jr. Back PS 41 l" Bvritchfd v. Primary. Secunrlary vkarsj arsilshl- Ho Qty. Qt7. DetcripliOB Dncrtplion Prlea PS 42 Stereo Swllche- OSO hco PS Single :;\" 17,,,', :!\', ~!'n., 3 1\', :(;h', 40, 80 ~oo Jte:!Mtol'$ mixel.!,-nlue-" MJ.lProS. aul.! ~~\'--'1!',,. Cl 700 K«lor> mixed vnlue* approx. r9 43 Phono J&r. froaji arlected 17« , spplt'k* 2lr. 25*. 4*..11%', 7v. nr. sar, lov, *, 6o l's Phollo 1>ouble no cooni (ount by b)' weffhl weight. 00'15 4A pa 44 Phono Double *-n-25v. PH 46 CO-Axial Surfact no Tn. Amp Prlc' P"P ltoo C~ 1i:J0 CalacJtou weight Uhlf'1 APProX. 1U3 PS Co Axial 0 20 B-PAK ("J 150 Capacitors mixed valuea approx. pa 4d Co-Axial Surtacv 0 10 Ty count by welfhl TH 47 Co-Axial Flush C20 MTSC.l p» A cops. 4 _ ltoo/l 1 iisa Fries F lop 4 P teann 12 4B 11, 1T&O/ top im c.::1 AO 50 Precision l-reclrlon Re»«lor. Resl~totl< 1%. ty *240:2 i ua 330 up 40? CATALOGUE AND LSTS uilaed mixe,l,'alue, values 0 46 m LEADS LR Speaker lead ~ D..!\. pluj! t '" 75 ltb \V ReRhLtorR mbet' preferred 0l.en en..j~ 31'pro:c:. :'1 lu'trt' N Send S.A.E. lop. ('4 TS lib W NcslKton inlseil prelerred Lfl apesker wj 2 pin D.r.S-.!UL- 10p. value* "alues 0 D N 85 to open ends appro*. 3 tm-tro" CARTRDGES long {olcil) (colletl) ACOfl -",cos c r. :; Pieces amorte,1 Ferrite Uod. 0'16 1 'C~A-B"""L~E~S~"';" (:r ~ll Rl.' LVi 5 Plecea a^mrleil Ferfita Hod< C M GP2-SC TWtaiV \' at ' '.!\ rll!,' fl'36 t': r93 1 :!801u V h-11/liel' n Bi Ct)!! Tuning t:ang~, )lw/lw \~ H.' 0'11 Hingle Lappel.! Ba:reeu 0 07 l:!'!ltj 1 OOll \' at ClU /lic' NSTRUMENT CASES CO 2 Tunln* Gangs. MW/LW VHK 0 55 CABLES CT C7 1 l Pack PACk Wire BO tio liictre* 1'1'<": metre.. Rxvirled CP i Single Lapped fierecu fifll filmii-l i:p93-l rnomv l-jomv at ut lrih/>tr B5 "l'!lorted 2 Screell 0 11 colours 0-85 CP 2 Twin Common Bcrteu 011 TTC J :!OOu Cry,.tal/H Olltlltlt '11 3 Stereo 8cre~led 0 12 J ~OH)(':,..... CO.al it.ll.1 20 O C 8 t 10 UctJ Heed Rwltebes Swltche., 00'11 85 CP Slerea Screened exe J-'J'jCj Crypts ; Ml OutjHit Jl-fl4 CP 4 " Four!-'our Core Comn^n Common accrei. 8creeu 00' $ 6C _ rn;...*lit.v 1-20 J :!oom~ Rtcrco/lli Output n '76 G C 9 3 a illcro Micro Swltcbe* Swltebel' C 0 11 M CP 5 (j Four }o'our Cere Core nd! ndividually vldually Screened Scrceut:d 010 o ao J-2V3 3 -TCons Scrrc<»/111 Oul vut 1-74 J '.!OCt (;erarljc/meu OutpuL '1.'6 J ~:!03 ~laghetlc CS0 C O Asserted."",ortf'lt pots Pots A do: Pradkl* l're Bcllo CP fl " Microphone )tlcropbone Fully lo' UtaMrO Uraftled Cable Cahle fl Crmml^Med Uulpnt Xl.t4 5mV/5clU/.,:{'\. including tityluli,4'86 C$1 ( :11 5 n Jack J"ck ftxheta Sockets 3 x 3 a'srn 5m 2 - CP.' i Three Core Mains <Ma in! Cable Cablfi! 008 Mas he! ad net n g c otyhn DrnV/Cem/Ki J ~~ft3s Helllaetllleut. stylu,", fhr ah",'c,a oo Slick, Slack Vlnjl Vin,l eorerrdi co,c:red, Stard Switch Type 00'61 45 CP a M Twin Oval Out Ma!n» Mains Cable C.ble T ;i5 Au,liu technlca magnetic N.i UMicih l.':1j.!'1 h Wldih... Jlvlxhl h jg-,,l! 'rke 'rlce Cl'.! Conden!lera prefenf'll 0'05 l'artriclge 4mY/:;cUl/!ieC 13 ao 11V 11\' 1 H" H" y 31". y" fl Cl2 30 Paper Condenserr preferre'i CP 9 Speaker Cable AT-53 Kefdacetnent»i yl a* f. t at-»e carlriilge Au>llii-techalta dmv/ocm/nec masnecie tyl'e.s mbed ""lues 0 16 Loo Co Asial O'1ft HV2 n\ ' ~ ir 11" A r," K 3" types mixed values 0 43 CP 10 Low Lom Co-AxUl <1 H CS Cl3 20!!O Klectrolyllcs Electrolytic. Trana. Trans. lyp<* type. 0-M ' U ALUMNUM BOXES CARBON CARBON FLM RESSTORS CH.'!lorted. Rardware- J-;l'! Range of CArbon "' Re:!iJtors, u.vl 11" 49, Nub/Bolt., Grommet, etc :: :~~ 5 ~r r :< ":< ~r *: li" 40? C4 Pack assorted Hardware LflR' Un 1/8tb watt Q\'iiJable at piece., UA2 4" > Nata/BulTi, (iramcnetielr. 55 POTENTOMETERS The ir 11" 4Bp Up CHi, Mahls Slide SW'ilche. 0'61 4'7K, 10K. ~2K. 4;K, look. :!:ZO ti. "iuk, ak!torle,1 intu the: fou owing grouva:- H.V3 11.\3 4" 01" 21" 11" X x ir CS 3 Mains 8!.Je SwSlcbrs 0 85 Leg.n 1/dth >;t2 wait llarvge available at Cxrhrm in PAKS Ffln* of 60 Peiiriort. plecee. 4-7K, 10K, 2SK. 47K, 0OK..".'OK. ^70K, into follawing gn»uys; 11" 49, u,.\~ a!".a" Y. 58p elfj A.umried trlps 4: Panel!' 0'61 Uf, ~~.».\4 4" r $ - 48? R rio Miud loo oll1uj- H!!O ohm:! GO, HAS.~r A5 4" "" -i~ v CO 20 Awnrfril Tag atrlps 8 Panels O AS tu. 7U. :!i" 2" 48p 49p 1 Single le!!s S,,'ltrh 0 15 Cll.\luJort~11 CUlltrol KUblll 0 61 n~ ~li:\'l!tl lk oblult- 8 :..!l\: ohm!!; 1li0, RAG 3" 2** r :!;~ ~: : ~:: i" 429 Cl? 10 Assorted Cunlrol Knobs 84 VC1 BJngle le.a S* tch 015 Rt M Hiied 100 ebcus-bto ohms 65? 42p 2: Single Switch 0'28 KA7 7" a" 21" 85, C6 ~ Rotary Wan ('bangc 8witchc~ 0 11 VC: Tem LeSlt ::h'itdl )t3 60 ~ti:\'l' 11 OH -8'!K ohlu~ ~O. ii.t.i 71" 859 CA 4 Kwlary Wave Change SwUcks 48 VC 7 Blngla D.P. Bwllcli K2 50 Mi*rl K uhmw-s-7k ohm* 69?.H K" """. rj" V ZMQ 1l-10 C~ ~ Kelay:ol 6-24 \ YC 1 K,ln LCt,, t" ~1iXl'11 look uhlll.!!-l ~feg. o llllt~ 60, HAH t.\:. J" rj" ). 4" CH 2 Kelay.* 6-24V Operating 0 45 VC 3 Tatukm Less swilcli 0 40 K3 00 5lixnl 10K ohin«52k' ohms 66? "," ~: 70? 70p C'.W l'al."k "het'h (f ellllper J.aruillate (j look Log auu Log THt:St-: A)U~ u:\ne'\1'.\ul"~ l'ucf.8- V " *... 1' J' KV 1.01' 'M toll ravu cadl mi cvo Faek aheeta of Cupper J^mtnaie VC 4 1K Lin LeM Switch Mixed 1C0K oiiub-1 Meg. ohn.r 69? bo x 20 *«i. Aq. ha lnt C VCfi 100K Los anil-log C -46 THKSK JL'ST J L"HT p AKK 1p KACK UM»KATAHLK E.-\Cll N l:scl. CL. V.A.T. PRCKS \"..".T. HORfZONTAL HORZONTAL CARBON VST OUR COMPONENT SHOP PRESETS B PAK 18 BALDOCK ST.,. WARE. Herts. (A10) wait wau oe eaeh B-PAK SUPEROR QUALTY each , , K. X. 22'2K, 2K. 44 7K 7K., 10K. 10K, 72K. LOW - NOSE CASSETTES 2~K, llpcnjon. Open ~ton. S.1.9-S.20 Sat. 9 G.:10 t-.iil. ll.m. Tel. T e K7. "Ki'. toojc. look. 770K, '1'20K, <76lC. 470K, M. 2U. :!M. e.. 7N 7H (MB. CtiO. Xp lap i.-bo. 1.,;90. (Sp tp CHO. C'10. SO. eop

23 - the lowest prices! B-PAK B PAK QUALTY GOMES COMES TO AUDO! AL10/AL20/AL30 AUDO wp NOW WE give GVE vou YOU 50w PEAK (25w R.M.S.). ~' "7.. AMPLFER MODULES 5 * p " K (.^r R J The ALtO..4.L20 AL30 unlla.re "imu.! n their appearance in tbeir itmnj CDtra! pecjftcatiod. However. cateful riecuon f=leet.lon of tht tbe pfutlc plutic pover Towercr, poyer dcvlctt carttul dnictl bat b.u rcralud relulled n a range ranee ot output powera powen frop( from 3 to 10 vatla watt. R.M.a- R.M.S. The veraatultf veru.tulty of tbelr their «Je«lgn design makti makes tbrm them ideal deal for UJe n players. tape recorden Ur«o lor teno amphoeni wo Jn record ampuften playera, camette lape caasette recorder*, cartrldie cariridl'f' tape pl.yen n the ear.t borne. Paramlter Condition. Performaael " 'U... ~ 100. U... lth ALGO) TRANSFORMERS T461 U.. "th ALlO) ' " ' lop Tft38 (U.. "th AMO, AL30) l'.. ' Hip lllt80 U "th AL60) 12'75 P '" P 261'. PA 12. PRE.AMPLlFER SPECFCATON Th* Th, FA lla 12 pre'iinpljfler pre ampluler baa bu been dealkived desl,lled to match nto Freqnency Frequency rei reaponlle 1H00t moil hndb<t bnd,et afareo.tereo ayalenii. ajatellll. t t. coiapallble colnpatlble with the 20Hj-po 20Hz 20Hx-BOKH*l-ailflj teiponne " - 60KHz (- adu, AL 10, 10. AL 20 add AL SO audio power ampllflcni ampliftera ll Baai it Ba.81 control «<»htrol contr~12db 60H r. ean,.an be uppllcd aupplled from lrom their aaaoclated &MOClated power uppllea. auppjlea. xreblc ± 2da at 60 lit control- There Tbere are two ilereo.tueo Jnpoli, nputs, one baa ha. been deilgned dellgned lor um Treble control uae ± i 14«MD UdB at. JtKlfz 14Klh _ltb Ceramlc cartridge. wblle tbe auxiliary nput will nput 1. mpedance lult. moat tma,netlc cartrldgea. }'ull details are 'iv~n lu 1 Meg. ohm tbe the apeclflcallon specffteatjon table, table. The four tour cunlrola control. mrt. are, from left to 4/ tjnput h _ nt 'jjnj ~~~~~~~t:n:~old\' rlcht right: : Volume add on/off (m/off ewllch,.wltch. balance, balancf'. haw hasl treble, t^nput 2. mpedance treble. 30 K ohni«ohml 'lbe U2mm x 8-4mm x 35mm. SenaitivJty 4mV Look for our SEMCONDUCTOR ADVERTSEMENTS in n Practical Wreless Wireless World Radio Constructor The STEREO 20 The 'Stereo 20' amplifier. mounted. ready wired. t.e.jtc.d unaone-pl~cechallll.me.. arln20 cm x 14cm x ls'6cm, ThSl Thla compact unit cornea comes compkle complete with wlt.h on/oft on/off switch nwitch 'rolume eolume control. control, balance, balance. bass bull treble Lreble codtrolfll, coulroje. TraDsloroler. Power supply Power amps. Attractively printed front panel match' match n, COntrol knob The St.ereo 20' hu been d dealgned.. lped to tn lit ftt into nto ma.t. most turntable (nmtable plinth* pllnthjl without wllhool nterfering with tbe fnechanlsm alt.ematlvrly, altarnstlvrly, inteiferlnr nto wllb a the separate eeparate mechanism cabinet. or Output po. er 20.. peak. 'nput 1 (Cer.) JOOmV into nto M. 1M. Jo ftq. k'rtq, teg- ree. 25Hz-20kHz. 26Tz-22kBz. nput 2 (Aux.) tmv m\o,ok. Manoonlc dl.tortlon distortion. nput 5 (Aua.> a... Baai control AraV tide ± ilmbat 36K. Harraonlc 12dB.t 14 M m 45 M F Tht AL10, AL20 AL30 until am mllar in belr appfaraoee n lh«lt lape player* n the ear md at home. AHMONC 'U.RONC W9T0RT1ON D8TORTON l"u - 3 WATTS l-khs t - 1Kllz 0-25% LOAD fftlfedance PBDANCB 8-16Cl JNPUT lput lifprdance PEDANCE ' =lklh 100 kcl PRBQUENCY FRBQUENCY BgePONflE RE8PON8E i ± MB 3dD Po-2 WATTS 50Hz-25KHz SENSTVTY lor 'or RATED O/P OP V«««V. \'. - 2W.»l-8n R- 8Cl r-lkux ' - 1KHz 75mV. EMS DJUENStONS DENSONS 3" x ~., >: ).. Tbo Tbe aoon table rel.tu to ALtO. A.L20 add AL30 TnoditltrL ahore modules. The labla following relate* lo fonowlng fable the table ontllnei AL10. AL20 outllne. fbo the dicerehce* ALSO difference. q in fhelr their workln; working condllfow. condlllodl. Para.lter MatLmum Mal.lmum Bapply 8upp17 Votlalr Voll.q'e AL10 AL0 25 AL20 ALaO ALao 30 fower Power output for tor 2% T.1L1). T.R.n. 3waU S watts OwaU. (RL \RL- 8fll 8Clf -1 KUx) KH.) RMH watt* RM8M. Mill. D Ruamn. watu RlSlD. RM8MiD. AUDO AMPLFER DDC- PRE A 1 ax MPLFERS CM CBOC MODULES PA r.~ 12. (DV (Uu with ALlO, ALO. AW» AY...!H A,\' AL30) ALU? a walu... tto RMS 'EMS.uo <4U AL watta... tto RKH R8 P U PA 100. (Uae wllhalco) lll-u AL watt#... tto RU9 EMS.1-20 POWER SUPPLES TRANSFORMERS M PS 12. msovltb (U wllh ALO.AL'O.ALOO) ALO, AL20, AL30) Mp 85p TM luae *JUl AL J* A * Ap APM ftpl (Uaevltb with ALSO] AL60) #8 n'l6 W T830 (Use wllh AL20, ALSO) KBONTPAKELfl... 1tONT PANEL8 F'.F.... P. l2»rnh.kh0bi 12 with. Knobs TAT.HQ M0 DUT0O (Use with AL60) *2 75 TAR 26 «. PA f2, PRE-ANPLFER SPECFCATFON th # Ceram o carlrtdbea while the aaaslary nput will "nput nput 1, 1. mpedance lutt moil fmajneuo oartrldgea. Foil drfalln are given d Bengitlvlty! Meg, SOOmV ohm fllxt 108njm x Mmm x 36mm. Serwlll Sehalllvlty 4m V Look for our Praetleal Wireless Wireless World Radio Constructor ALL PRCES NCLUDE V.A.T.. The STEREO 20 "T tina The one.plecc 'Slereo 30' ch>«l>nieuarlfig amplifier li mounted, 20 cm ready X 14 cm wired X 5 ft cm. LeJicd m B t eaanrormer, Po* er supply Power amps. *. fjf log control knobs- Tbe'Btereo 20* baa heen ^kt, Output power 20w peak. npul 1 (Ccr.) A i doht Treble lyptcauy cc^ ihdb 0 26 ; at at 14kH*. 1 watt. CM sa /! / * " ^ SORa ",picaoy 0 26% at. 1 watt. T,.ble con. ± UdB a" 14kHz. TC20 TEAK VENEERED CABNET Por Pot Slereo BUrto 20 (front boud board 1dr\lled) onddlkd).le!»«101" x X 81" 6 't x 3". 11'1$. 3» r piu. plus an> SOp... postage tag. SHPO SHP80 STEREO HEADPHONES ' 11) nhm;'h~dancc, "~rrquenc,. re'ponlte 20 tn 'lo.ooohz Stereo/mono switch yulume 4-Jfi nhmi imfwdancc. FrcQueney reiponw 20 in * atnreo/monc ewllch volume PLUS THERMAL PROTECTON! --~~~- The NEW AL60 Hi-Fi Audio Amplifier FOR ONLY 4.25 Max Heal Heat Sink temp. 90' 90 c. c. # Thermal Frequency 20Hz tu 100KHz Fcedbatk Feedback ft Freqiwncy Response 20Hx to Latest Design mprovemrnii rmproyemenl~ lookhz Load 3, Load-3, 4, 8 or 16 ohmj ohms # Distortion better than O-l",. O' ~... at t Signal to noise ratio 80dB O-lKHz O'KHz # OvcraH Overall size 63mm.' 105mm 9 Supply voltage 5-S volts 3niin 13mm Especially deslencd designed to a strict specification. Only the finest components have been used the latest solid state stale circuitry incorporated incorporaled in thin thi, powerful little amplifier which should satisfy the he most mosl critical A.F A. f enthusiast. enthusiast. STABLSED POWER MODULE SPM80 SP3lB0lseBpfCi*llydp«lKneil ~U.M8 0 la especially deaigne(t topowcr lopower 2 of the tbe ALtiU ALtju /ffsv AinpliQera, Arnpliften, up to B 15 watt (r.ni.n.) (r,m.,) per channel cbannelllmul >lmub rv '^WCA./ taaeouftly. uneoual)'". Tbli Tb181110dule module einbodka ernbodlea the UtrBtcompoDenti latest component. a.nd techniques incorporating complete,horl.. circuit circuit prolccuon. locbalqnra protect.ion. Wllb With ncorpomtlnr the: auldltlon addition of (be eomplct* the llaln* Main. Trani* ihori Tranl' {orrner BMT80, the provide 011tput.8 ot up l ' ~ amp«-farmer amps at 3D BMTSO, 35 rolta. volt Site: tbo unit Size: 63mm will X provido x lodmm aulpula t05mm x SOmm. Of UP to 3'ft 30mm. 'rhel'e unit. 8y.t.em8 ot the h l,heat ouallty Tbene unit* QUAUty at a hitherto enable you unobtainable to build Audio price. Byicm* Alsn Also deal of Lhe ideal for b(gbc«i maoj mao, other "ther application* applications lucludiny: Ubcd tncluding:-olaco Hr 1 Syaternll. '""*. Public Addr*" Addre fntercom ntercom Unll*,etc. linu HlHK>kassailable Hhook availahle 10p lop PRCE 3' TRANSFORMER B MT p. A p. 28p TRANSFORMER BMTSO 2'15 p. & p. 28p STEREO PRE-AMPLtFER PRE AMPLlFER TYPE PAT00 PA100 Built Hum to a apeclbcation peci6cauon NOT a price, price. yd yet till t the greateit Kfealeat value nlue on the market, market. the t.be PA100 P AOO alerco.tereo pre-ampliner pre ampliner ha» ha. been Cbncelved Cbneelved from trorn ihc the latf»l late," circuit tfchnlquea. tecbnique., Deaigned uae ALSO power amplifter.y.t.em, thip;quality unitlncorporatt. no Deaignfd DO leai... than for ban eight Uie with ullieoo the ALftOpowcraiQpllfler«y*l«ni.mcon plauar plaoar tramkion, tran.j.lora, two of theec ( tblaquallty the8c are apeclatly made tpeclauy aekcted unit ncorporate*.wlected low nol** Dol.. NTN NPN devices devlee. lor for ttae uae n the nput input slages. atages Three atereo nput rumble Arid acratch ntterm art' ft aturea PAlOO which whlrh switched alio al,o bu slereo baa a BTEREO/MONO npot*. ami rumblr STEREO/MONO awltch, 8wlh'h. vifiume, elraich \"llurnl". balance fillerhalanrc arc frduirs anll tnmtlnunusly of the l'lutlnu(lu;r variable PAlOn v.rlabl. baa* hafll ami trfble-control*. treble-control SFKCmCATOK SPECPCATO( Frequency JteBponne Reapollltt- 2011*'.!OU", 'JOKlxi ~OKUz:!: Mt l,t H V a, K&fr llariroaic Harmonic DlBlortlon Dlatortion t»«lter heller than 01 a 0,1 ~.o 0 npub: :1,25 60K 0.JuiX'4SK fn^s^* nputs: 1. Tape Head 3-23 mv into ftok fl 2. Radio. i6 inlo 50K Cl ftyrfcp-- v 2, Ladlo. Tuner 7ft mv into fiok fi P.l. into 50K Cl All,",-11 input 3. nput voltage* Magnetic voltages are P.lf. for tor an all uulpul 3 uutput ol mv or 250mV. nto DOK Tape O un<l P.U.».U. nput, 'lutt ' equallied equaullcd lo to RlAA RA.~ curve eun'" within wuhln i ::: db. l ds. from 201fx 20Hz to 20X17*. 2flKns. Baaa laei Control ::: fibd UibB at20uz 20Hz Treble Control ::: ± LWa*t 15dB at 20 KTlz K "l Filters: K LL»a! Humble Rumble (High (U,b Pasel P.a~1 100Hz loohi 8cratch Bcratcb (Low ra'sl Pall"} 8KHz 0KH* Algnal/Noise ~,na/noi"e Hat RatJro n better tbali thall.. KftdH 6lid t nput overto»d overload -!- 26dB Supply + + 2flda '~ 35 vnlts volls at 20mA \ nlmenllimu lllmengbmi * 29'.!111 vs'jmiu y ;- 0'JTnm 8~mm x aftnnn 3anun ONLY '25 MK 60 AUDO KT (!omprialng: Oomprlalng:'i '..!... L60.l x SPM80, J:. ll'l'mmo, x PA lou, front 1l1mei. 1 ul parh; 1" nclude nn-or Ott-oft switch. switch, x ALSO, neon 1 zsfmdo. mllcaior, * ndicator. Bleren 1W?MN0, gtereo hcblillhone bumlphnne * l'.\ lod, wxikcli fruftl onckets plua jianel, plum inslmcffr'n J kit of nstrnction boovtel-. parla i- booklet-. Complete Complito Price: trico: 128''15 C08 7& plus plul p ponfare posta-re TEAK 60 AUDO KT Comprising: Ooniprklng; \"Cllcercu Hh:c H1 " xli." x 31". other parts nclude alwnlnlutt'l chaaaifl. cbabbia, heal. nk Teak ht'at!llnk ami *'cnppred nn.1 frnni frnnt panel cabinet pancl lirnrk^t, alrc JilJ" rar kl'l. plu, x ptt1:-1 bark 11V i ha.r k 1.a.h pnnrl 31", isther t'l RUd parls nclode albinicvlum \not Apt^mprlate 'LPllfo,.rlate jocheta aocket.. eu e\c. Kit Kli Driee: price: plul piu, :lop."lop pvllagc "u'la~c Giro No Please send all orders direct to warehouse despatch department BhPAK P.O. BOX6, WARE-HERTS Postage packing add lip, Overseas add extra for airmail, Mini/num order 'SSp. Cash with order please. Guaranteed Satisfaction or Money Back 889

24 POLLUTON WWHEN Samuel Morse first pressed his key sent the letter 'A' (dit-dah) he heralded the start of com- com munication by a method now universally referred to as the Morse Code. n the days of the spark transmitter coherer re- re ceiver radio communication was fraught with many prob- prob lems. Atmospheric conditions, electrical storms static were about the only phenomena t~at that nhibited inhibited etheric communication. The spark transmitter with its familiar "buzz" spreading over a wide b of frequencies certainly made life easy on the receiving side-no side no tuning was re- required-it quired it was possible to receive many stations all at the same time. With the advancement of radio communication tech- tech niques the introduction of the superheterodyne re- re ceiver, the art of communication by wireless waves has become commonplace. Our readers who monitor the many wavebs for one reason or (he the other, surely have cursed when reception has been ail all but obliterated by man-made electrical nterference interference of one kind or the other. nterference of this nature is widespread is on the ncrease. increase. The ntroduction introduction of a multitude of devices that produce elec- elec trical arcing or sparking either when switches or electric motors are operated all add to the levels of electronic pollution. The short wavebs are polluted with a pro- pro liferation of garbling jammers running RF output powers in the megawatt region. The orbital scrapyard surrounding Mother Earth is rapidly filling with devices emitting weird noises interference to our radio telescopes s is on the increase. We were told that VHF FM broadcasting would be the answer to the medium wave interference problem. We now find that the VHF FM b is a truly excellent medium for the reception of every piece of electrical interference in the neighbourhood. Thermostats, boilerstats on gas-fired domestic systems, fridges, washing machines, hairdryers, sewing machines the machines-the list is endless. One device that causes interference over a wide b (from long waves to the 10m b beyond) is the modem modern TV receiver receiver especially the more recent models that ncorporate incorporate thyrlsfor thyristor switching n in the linetimebase output circuit, which is now a most virulent source of "electronic pollution". This also applies to domestic thyrlstor thyristor lighting dimmers thy- thy ristor/triac psychedelic lighting displays for the home discotheque, discotheque. it t would appear that we are really up against it. One step forward n in one field of technology inevitably results in a backward step for the listener wherever he may be! We all ail contribute in one way or the other to the levels of "electronic pollution". The Post Office will investigate certain forms of inter- interference-a pamphlet* s is available at most post offices offices ference a but before we all deluge the P.O. p.a. with unnecessary moans, read the leaflet carefully ascertain whether your "elec- "elec tronic pollution" problems are covered by existing legisla- legisla tion. You never know you know-you may be the offender yourself! LONEL LlONEL E. HOWES Editor. HOWES-Ediior. * Goocf Radio Television Reception Form TSG. Good Radio Television Reception-Form T113G. 890 mm. 45W uar UHF Tl'ansislol' Transistor LTEST power transi~tors LATEST in the series of UHF power transistors from! Motorola is the M1FG21. MRF621. Designed for 12-SV ' 5V operation be- be tween MHz, the MRF621 forms an ideal basis for power amplifiers in com- com mercial/industrial u.h.f. u.h.f_ mobile radio equipment. This advanced device will provide 45W Pout at 470MHz with a 12-5V 12 collector supply. At rated power output minimum power,gain is 4'8dB 4-8dB with a collector efficiency of 55% minimum. No degradation in out- out put power occurs when working into a a 20:1 VSWRat any phase angle. Sonab wins Design Awal'd Award FFOUR products in the current range of Sonab hifl hifi equip- equip ment have received Design Awards for 1974 from the Swedish Society of ndustrial Designers (SD). The award-winning Sonab pro- pro ducts are the R4000 tuner-ampli- tuner-ampli fier; the 0A12 OA12 pair of loud- loud speakers; the 55S turntable H20 headphones all headphones-all designed for Sonab by Lars Lalierstedt. Lallerstedt. Scottish Scollish stereo slel'eo FFROM the start of pro- pro grammes last October, some of Radio Scotl's Scot's music light entertainment pro- pro grammes certain Radio 4 items were being broadcast in stereo from kom the Kirk o'shotts o'shotlts v.h.f. transmitter. Radio 2 Radio 3 were already in il1 stereo. The stereo signals are re-broad- re~broad cast by the relay stations at Ashkirk (serving much of the Border country), Ayr, Campbel- Campbel town, Forfar (covering most of Angus), Lochgilphead, Perth, Pit- Pit lochry, Millburn Mulr Muir (Vale of Leven), Rosneath (Gareloch) Toward. Some of these stations are a long way from Kirk o'shotts the quality consistency of the re-broadcast stereo signals will not be known for some time, after tests have been carried out..

25 KMS.. Canadian tower A 1'25. million contract to equip the new third-of-a- third-of-a A mile CN observation communications tower in Toronto. Toronto, Canada, with a complete antenna complex for all f.m. TV broadcasting services has been won by the Telecommunications Division of EM Ltd, Hayes. Hayes, Middlesex. When completed, the 1805 foot high CN tower in Toronto will be the tallest self-supporting struc- struc ture in the world. The antenna system surmounting the main concrete tower will be carried on a 220 ton needle-shaped steel structure over 300 feet tall. Transmissions from this height give major benefits in range the elimination of "ghosting" but, at over 1500 feet, the arduous climatic conditions found normally even at ground level during the Canadian winter are aggravated by extremely severe icing, snow high winds. For this reason, an impor- impor tant part of the contract com- com prised the provision of a glass reinforced plastic radome. This will he be designed constructed in Britain by Hunting ndustrial Plastics Ltd, erected to pro- pro tect the mast structure during the winter. The complete installation to be provided by EM comprises a formation of four arrays arranged as follows: Channel follows:-channel 5, Canadian Broadcasting Corpora Corpora- tion. ntended for colour TV transmissions, this is a single channel, directional d c t ion a v.h.f. antenna having a gain of 8. The array is 55 feet tall is at a mean height of 1,572 feet- feet. Channel 9. 9, CFTO-TV Ltd. Also in- in tended for colour TV transmissions this second directional v.h.f. is similar to that for channel 5, hut but has a gain of 11 radiated from a' a: 49 foot high array located at a mean height of 1,635 feet. Channel 19 25, CBC Educational. An omnidirectional u.h.f. array for colour TV. t is arranged as a dual antenna, with one channel allocated to CBC the second to the educational transmissions. Positioned on the mast at a mean height of 1,695 feet, this array is 60 feet tall has a gain of 31. FM Transmis Transmis- sions. The master f.m. antenna occupies the lowest section of the the' PHlPPl mast, has a mean height of 1,513 feet Measuring 60 feet high iatt by 26 feet diameter, this antenna is being manufactured under licence from Alford Manufactur- Manufactur ing Co of the USA, is based upon those supplied for the the' Empire State Building Han- Han cock Tower, Chicago. The array comprises a high- high power circularly polarised p 0 a r i antenna, enables the simul- simul taneous transmission of eleven f.m. sound broadcasts. Although not yet allocated, provision is also being made for two further arrays to accommodate channels 45, channel 79. These Thcse will ' comprise a 50 fool foot long, three channel u.h.f. array for channels 45, 51 57, with a 25 foot long by 5 foot diameter omnidirectional type u.h.f. array For for channel On the f.m. array cross dipoles are employed, whilst channels 5 9 are equipped with con- con ventional dipoles. Additionally, the channel array is provided with Emislot panels, provision is made for these r.w - - panels on the. the' two remaining arrays. Tfie The tower lower (piclured (pictured Aug. 15). Below: the tower compared with other buildings..., ~ '= n ~ ;r r _-- --~ ri111 --:-:- LA~ 1\ Emley Empire Stale State World Trade Ojtankino Ostankino en Moor Building Centre Towar Tower Tower 1180 FT New York New York Moscow Toronto 1472 FT 1727 FT 1748 FT 1805 FT T472 FT 1727 FT 1748 FT

26 C HOME SPEECH ROUTNG The basic arrangement of diodes for speech- speech routing is shown in Fig. 3. With the receivers at rest, the telephones draw no current both diodes are non-conduoting. f the hset is lifted at Sub- Sub scriber 1, D13 will conduct D14 will remain non- n EPHONE EXCHA S EVERAL mail order firms dealing in surplus EPHONE EXCHAN J. J.Thornton Lawrence T. TEng(C.E.l.) (C.E..) SEVERAL mall order firrns dealing in surplus heavy current through the LF choke. On releas releas- electronic equipment are offering for sale, at ing the dial, the "normally closed" dial contacts open very reasonable prices, ex G.P G-P-O..0. telephones close ten times producing a substantial pulsing complete with dial bell. Two of these telephones voltage across the line. can be connected to provide ringing speech This voltage is passed through the bell series communication between, for example, workshop capacitor of the called telephone rings the bell. house, bedroom downstairs, office shop, etc. When the dial comes to rest the N.O. contacts open A simplified circuit of the telephone is shown in current again flows Hows through the transmitter. Fig, Fig. 1 the method of connection in Fig. 2. The called subscriber lifts his hset his trans trans- mitter is also energised. During speech, variations in transmitter resis resis- TWO TELEPHONE OPERATON tance will cause speech voltages to be developed The two telephones are connected in parallel across the line incoming speech voltages will fed with direct current through an LF choke as operate the receiver (earphone). The LF choke pro- pro shown in Fig. 2. When calling, the caller lifts his vides a direct current path to energise the trans- trans hset the rest contacts close thus energising mitters whilst presenting a high AC impedance to the speech signals. The dial pulsing rate is different from the fre- fre quency normally used for ringing the bell some improvement in ringing can be made by suitable adjustment to the bells. To do this the base of the telephone should be removed. The bell fixing hole is made off-centre loosening the fixing screw will allow the bell to be rotated, then tightened, to give the best sounding ring. mm After using a simple two telephone system for some time the need was felt for a system incorporat- incorporat ing several extensions the automatic telephone exchange, which is the subject of this article, was ill developed. n the past, home telephone exchanges have used Uniselectors for calling speech rout- rout~ ing, but as the Uniselector is very noisy in operation an alternative system was designed using solid state devices reed relays. The reed relays are ilre used for ringing purposes the diodes used for speech routing. his transmitter (carbon microphone) as shown in Fig. 1. He then dials "0" "Q" the "normally open" dial contacts close causing a short shoft!: circuit across the line. 892

27 Normally open : Hset 20V Normally closed Dial contacts Bell Normally closed (hsel (hset o(() off) lhset rest LF choke Line Fig. t: 1 : With the hsel hset lifted the contacts in a simple dial telephone circuit are in the position shown here. Fig. 2: Basic connections for a two telephone system. T' -LfhO' chokeja S R12 > R13 lines Other?R12?R13 0ther lines * components list Resistors Rt R1 100U loon R R9 4-7ka 4'7kO R R6 330 RO Rl0 4-7ka 4'7kO R3 2-2ktf 2 2kO R7 kn 1kO R11 3-3kn 3 3kO R4 22 2kn '2ka R8 kfi lko R1Z-20 R kn 47ial All i! watt 5% Pr. R21 R2t soon 500(t 2W WW. H22 R WWW 5W VRl VR1 50kO 50kfi'miniature preset, p re,s et, horizontal mounting Capacitors Cl C1 50/tF 50,uF 6V C6. 0 1f1F l/if C2 10//F6V loll F C7 0-1/<F O' l/lf C3 200/iF 200,uF6V C8 CB 4000/iF40V 4000,uF 40V C4 0'01/rF O' Ol,uF C9 " 8//F250V 8pF C5 10O/( 100lfF6V F Semiconductors Trt Tr2 SCZ14B Tr3 BC184B SC184B S44 (or 1N914) 1C1 Cl VR475F (4'75V zener) 1CZ ic D24 1S3007 (7V zener), C DB1A (1A bridge rec.) 1C4 C Miscellaneous F1 Fl fuse 2S0m 250mA A anti-surge. F2 500mA fuse. F3500mA fuse. L L1 LF choke 3H S00 (see text). LP1 Mains neon indicator. RLA to RLJ Reed relays (Doram ). S Sl DPST toggle. T1 transformer niains/16-3v mains/16'3v(doram ) ); T2. transformer mains/20 + -(- 20V (Doram ). Case S" 5"x,5" x x x8' N long (Lektrokit, (Lektr'okit, Home Radio) or similar. : <. ; The PCB PCS can be obtained from J. Stuart, 40 Aberconway Road, Prestatyn, Clwyd, LL199HL 9HL lor 2 nclusive of post packing. for 2 inclusive of post packing.,013 XD14 Subscriber 1 Subscriber 2 Fig. 3: 3 : Simplified speech switching circuit. Counting ringing circuit 012 'U 50V 160V p-p 0-p 50Hz Reed relay SUb. 2 conducting because of the associated resistor R13 maintaining line 2 at the battery supply voltage. f Subscriber 2 hset Ss is now lifted D14 will now also conduct speech communication can take place through D13 DM, D14, the LF choke being the common impedance as before. RNGNG SYSTEM The simplified arrangement for ringing is shown in Fig. 4. When the hset is lifted at Sub. 1,, D13 conducts as before as the voltage on the line is greater than +7 volts D12 remains non-conduc- non-conduc tive. When the dial on Sub. 1 is operated, the line voltage falls to zero D12 conducts condu,cts passes dialling pulses into the counting ringing circuit. f the caller, Sub. 1, has dialled "2," the counting ringing circuit will energise reed relay Sub. 2 cause a 60 volt peak-peak AC signal to be con- con nected to line 2 thus ringing the bell at Sub. 2. As soon,as the hset at Sub. 2 is lifted, DM D14 (omitted from Fig. 4 for clarity) conducts, allowing speech communication as described previously. A separate reed relay is required for each subscriber. Pig, Fig. 4: 4 : Ringing circuit in a simple form. Sub. 2 CRCUT OPERATON.. The full circuit is given in Fig. 5 Fig. 6. The circuit operation begins when the caller lifts his hse,t. hset. Assume that, as before, the caller is Sub. 1 When the hset is lifted, current will flow from the +20 volt supply through L, L1, D13 Sub. 1 telephone to the common line, Fig.,Pig. 6. This telephone is now energised the voltage across the line is approximately 8 to 16 volts, depending on the total resistance of the telephone. 893

28 Mil 1,11 R9 4 7k Kl if. R10 4 7k Kl Ringing b R3 2 2k isifl * mm vkm RLA1 A R1 100 in Wi iw El m m- (ib i ft & m. R2 t-trig JF R4 R6 SL. 2 2k 33 ~ Dialling R8 L 1k Ringing R7 1k Tr3 BC184 OV Fig, Fig. 5: Counting anil ringing circuit n in the exchange described n in the text. Assume tiat that Sub. 1 dials Sub. 3. On the backward rotation of the dial, the line is shorted by the dial- dial ling contacts the voltage across the line is zero. Curront Current now flows through relay A, D12 D13, thus energising relay A (Fig. 6). When Sub. 1 re- re leases the dial it returns to rest in so doing contacts contaots open short the line three times, finally coming to rest with the telephone energised as pre- pre viously. The waveforms are shown in Fig. 8. The contacts of relay A connect B.1 R to the volt supply, Fig. 5, a logic 1 level is applied to the Schmitt trigger gate Cla. A Schmitt trigger is used in this position so that the input signal can be smoothed by El, R, C1 Cl to eliminate spurious signals caused by contact bounce yet provide a fast- fast switching clean output suitable for driving the logic circuits. The output of Cla, containing the dialled information now follows two routes, to Trl Tr C2. n order to detect the completion of a group of dialling pulses to produce a signal at the end of this group it is necessary to have an electronic circuit equivalent to a "slugged" relay. This is formed by Trl Clb. The first of the dialling pulses turns Trl hard on, discharging Co C3 causing the inputs of Clb Olb to be at logic 0 thus the output of Clb to be at logic 1.. This positive transition is differen- differentiatedby C4 R5 to produce a positive pulse to logic 1 which resets the 7490 decade counter to zero. 894 Between each dialling pulse C3 begins to recharge from the input current of Clb lolb but does not reach logic 1 level because the next dialling pulse dis- dis charges it again, again. However, after afoter the last dialling pulse, the input to Clb rises to tq logic 1 the out- out put flips to logic 0. O. The other route for the diaihng dialling pulses is direct to the input of the 7490 decade counter, C2. The counter counts on the negative- negative going edge of each dialling pulse in our example ex.ample would count 3 (binary 0011).. t will be noted from the waveforms that a nega- nega tive step (to logic 0) occurs when the dial is first rotated this is counted by the decade counter, but as the counter is reset to zero on the leading edge of the first true dialling pulse, it does not cause a dialling error. The binary coded decimal output from C2 is fed directly to the decoder-driver, C4, where, in our example, output 3 would be clamped to the 0v Ov line all other outputs would be non-conducting- non-conducting. Returning now to Clb, at the end of a group of dialling pulses, the output flips from logic 1 to logic 0. O. This negative transition triggers the mono- mono stable C3, which produces a logic 1 output pulse having a -duration duration set by VR1 VR.l (1-5 seconds approx.). The positive pulse from TC3 C3 turns on Tr3 Tr2, thus energising only relay D as this is connected to the Ov line through the ino. 3 output of C4.

29 From L L1 in fn power supply & Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8 Line 9 m m E +20V--~~ ~A.~----~ +20Vfrom power supply R11 3'3k R12-R20... A7k D22~~ : F )- -4 ~--~~~~--~~~ ~--~~~~--~~~~~-~~ RLD1 ~ & m G )- ~--~~~~--~~~ ~~~~--~~~~~-~~RLE1 ~ c: v--<>-- ir H r ~~~~--~ ~--~~~~--~~RLF1 m r ~_7~~~ l-~~~~~~ r ~--~~~ ~~~~~~ r ~~~ ~--~~~ & o J o K L r ~ ~ ~~-ARLJ1 Common C~mmon ~ y ;k.1 Alldtodes diodes... 1S44 Speech busbar ~omc9+ rom '-.0 ir power n power supply OV Printed crrcoit circuit board OV fig. 6,- ffema/nder of the exchange, sho^v/ng fhe speech swlichlng ringing circuitry- Below left, the finished PCB of an earlier version of the exchange n which five C's were used instead of four. Below right, power supply panel. Fig. 6: Remainder of the exchange, showing the speech switching ringing circuitry. Below left, the finished PCB of an earlier version of/he. exchange in which five C's were used instead of four. Below right. power supply panel. 14 r- 4 l! % h 895

30 250V LP1 16 3V OV F2 500mA " "- R100S1A R W Speech busbar R W +20V E 250V OV T2 F3 Ringing busbar 500mA 20V N +7V 6OVP-P\ +5V (7V) L jul r. Printed circuit board Fig. 7: Power supply circuit, the panel [or (or which is rnounled mounted on the righlhanet righlh side of o( the unit shown on the first (irst page. Sub. SUb. b, lifts hset Called sub. lifts hset t l Commences dialling End of dialling Ringing stops ^Clear down Exchange-.l Exchange-wi ~ Release dial ~in9in9 Ringing starts i+-traffic-+i ^Exchange t--exchange free! i T T free ~ ~ ~~Nlr---~~~~--~--. Printed circuit board 'C : ommences d' la 11 n9 ' End of dalling Ringing stops! -.l -Clear down +20 a. ".. : i! ' ~ Sub line voltage b. c. d. e. f. OV ~-----~ 0--- ~ 1--- ~... FOialling period==!.. -:- -t V (unused) p t S3007 Hn Counterresettozero~' reset to zero-a ~ ~ -T Ringing4 F ~, ~,----~ g. Called sub. +'o'--wm~~i~;~ull 50Hz line voltage Ringing voltage ft\ 60V p-p pop i ^ " i...--'r O 0--- OV- - Fig. B.: Wayefor/ns liming diagram in lite dintfing sequence- Fig. 8 : Waveforms timing diagram in the dialling sequence. The reed relay D connects an AC ringing signal of 60 volts peak-peak from T2 to line 3 which rings the bell in Sub. 3 telephone for a duration set by VR1. VRl. When Sub. 3 lifts his hset, current flows through D15 thus connecting both telephones to the Speech Bus bar, permitting two-way conversation. At the completion of the call the caller the called replace their h sets causing D13 D15 to dis- dis connect. 'No other "clearing down" is required, the decade counter is reset to zero at the commencement of the next call. The 50Hz ringing voltage from T2 is AC coupled to the Ringing Bus bar, by C9 the negative peaks cause D22 to conduct, charging C9 thus prevent- 896 ing the negative half cycles from swinging below +20 volts. This ensures that when the ringing signal from the Ringing Bus is connected to a subscriber it will not cause the associated speech routing diode to conduct will prevent the ringing signal from appearing on the Speech Bus. The inductance of the LF choke, L, Ll, is not critical but the resistance should be approximately 350 ohms. f a choke of the correct resistance is not available, one having a lower resistance may be used with a suitable resistor connected in series to raise the total resistance to the correct value. The power supply for the telephone exchange is in operation continuously consumes approximately

31 o z %n 'CD l> o Fig. 9 : The pe8 layout s given here actual sze so that it may be copied.,-<:, o o o o o o,,: 3 watts, watts. Transformer n, bridge rectifier D25 CB provide the + 20 volt supply for powering the tele phones this is also the source of the + 5 volt +7 volt supplies which are regulated by zener/break down diodes D2'3 artd D24 respectively, Fig. 7. Tr,ansformer T2 provides the ringing voltage for the Ringing Bus. Both transformers are adequately fused for safe unattended operation. All the circuitry with the exception of the power supply components is built on a Bin x 4 3 4in printed 897

32 To L on To L1 on power pwvct supply OV to 72 CX power supply OVto T2 on power supply Note: Note: Unmarked Unmarted leads trom (rom pads D,E,F CiEF etc. go to terminal block. o o To C9 +vc on power supply ToC9 +veon power supply Ul 'L f# -RLei:-i! im S f KB o E51 '>3 o 'M 'T'l o 1^1 *n50 LfT"! Km fy?. i 'L* ' o F/ff.«. tjyoyj of Fig. /0: Ll)'out of compomnts cvmpcnrnli And MJd corvtecf/on* conmctions to th. PCS. fftt f>cb. T.TTT +2W to C8+veor +20'1 to C6+.oeon power Power supply i a-t-«-rj o :B inlj TXTTT 1:1* HRgJ o o BC184,BC214 8C184, BC 21-1 circuit board, Fig. 9/10. The power supply com- com ling is carried out in the usual way VR1 may be ponents are mounted moujil:ed on a similar sized sired metal m~tal plate adjusted to give the required length of ring. The the complete unit is housed in a Sin x Sin case telephone bells may be adjusted for best ringing as S'ain 8 1 2in long, constructed from Lektrokit parts. described previously... The 'system has the advantage that when the two CONNECTON sub AND OPERATON subscribers are in communication a further sub- scriber may be dialled join in the conversation. Each telephone is is connected between the appropri- appropri Two telephones may be connected in parallel on one ate line terminal the common line terminal. Dial- line f if required. qq 898

33 Complete the coupon we'll send you well sendyou our newcatalogue.completelyfree. i: i 11?;---, The new Heathkit catalogue msam titsi ncluding our full range of test is now out. Full as ever with exciting, HP^*" " equipment,amateurradiogear,hi-fi radio new models. To make building a i equipment many general Heathkit even more interesting 1 interest kits. satisfying. So, when you receive your And,naturally, naturally, being Heathkit, every kit is absolutely catalogue you should have hours of pleasant reading. complete. Right down to the last nut boll. bolt. So you won't And,if you happen to be in London or Gloucester, call find yourself embarrassingly short of a vital component in see us. The xindon London Heathkit Centre is at 233 on a Saturday evening-when the shops are shut. Tottenham Court Road. The Gloucester showroom is next You'll also get a very easy to underst instruction toour our factory in Bristol Road. manualthat takesyou step by step through the assembly. At either one you'll you')) be able to see for yourselfthe Clip the coupon now w we'll send you your free copy one thing the catalogue can't show you. to browse through. Namely, how well a completed Heathkit performs. With the world's worlds largest range of electronic kits to Heath (Gloucester) (Gloucester) Limited, Dept. PW-25,Bristol Road, choose from, there really is something for everyone. Gloucester, GL2 6EE.Tel; Tel: Gloucester (0452) AM/FM AMlFM digital electronic clock-radio. An osdlloscoix-fromththcailikil oscilloscope the Heathkit range. Digital eletm electronic roniccar carclol'kje1apsed clock/elapscl ti tilllt"r. ncr sv.s r '" The newheathkit new catalogue.out Out now FREE. To:Heath (Gloucester) Limited, Dept.PW-25, Gloucester, GL2 6EEPlease 6EE.Please send me my free Heathkit catalogue. Name -Address.. Postcode- Remember easy terms are available with the Heathkit Monthly Budget Plan. 1Li ';&:i:h9~ ~ ~ 899

34 ALL ml TEMS SUBJECT TO MANUFACTURERS MfmiKTUKiHS irems ajtacr NCtEASE HCHLUe to AND WDLVUlMUn AVAlLAB/UTY Personal Callers Caliere are Welcame! Welcome! : 9_ High Quality C v'-vv - rmr. Construction - Construction JOSTY HDXT Kits_ Kits, stocked! atoll all branches ~ Send for - _.._.- catalogue! catalogue! AHPLFEHS AMPLFERS Teleton SAQ w»u 27 watt Rotel RA2 RA211 4) 95 43'95 RA111 RA3 S4-9S RA611 RA61 at-9s Leak teak Deita Samsui SamiuiAUO AUSOS AU50S Sinclair Sinclair"OOO Sinclair ' TUNERS & RECEVERS TUNERS & RECEVERS Leak leak Delta AM/fM FM M-7S Sinclair2000/ /<4000 Tuner Rotel Hotel RT ' Hotel Rotel RX50A Tuner/ Toner/ Amp ' 95 Hotel Rotel S2A Samoi Sansui 210 AM/fH/MPX ' AM/FM/MPX A 3S0A AM/FM/MPX RECORD DECKS RECORD DECKS SP2S Mk Garrard SP25 SP2S MklV ' BSR MP BSR nvicta P & C/SC7M CfSC7M ' 95 Garrard SP25 SP2S MklV P i & C G/ AP76 Module Goidrinj Goldring GL78 PRC/ P & Cl G800E ' 95 Connoisieor Connoisseur BOt BD Kit BD2 Chaatit/SAL/2 Chassis/SAU ll 50 SAU SCU 5 ' 95 TAPE DECKS (nsurance 2-00) TAPE DECKS (nsurance 2'00) Akai 40000$.. ooods Reel to Reel DB.. ooodb Reel to Reel Dolby ' (721L 1721 L Special Speci.1 Offer ' GXC360 GXC36D GXC38D GXC18D ' CS33D Akai CRSD CR crack 8-track Rec. player ' SPEAKERS Chassis Speakers EM (Plain) 3inx8in. 3, 8 or S ohm Baas unit 2-30 with Single Tweeter (only 8ohm) 2-45 with Twin Tweeter 3-95 Type 350 Kit 15 watt 8 ohm in xsin Baas unit 15 watt 8 ohm 4-95 Bin x Sin S watt 3, 8 or S ohm 1-50 Bin x5in 10 watt Dualcone fl ohm (" 10 watt ohm 2-45 Sin 10 wate 8 ohm in 20 watt 8 ohm 4-95 Fane Sin 4 or 15 ohm 2-25 fane 7in x 4in 3 or 6 ohm 1-20 Elac Oin 8 ohm Dualcone 2-50 Elac loin 8 ohm Dualcone 1-75 Goodman EJin 8 ohm Dualeohe 2-40 Baker'Group 25 J2in8or S Ohm 7-95 Adasera "Top 20' 2in 25 watt 8 or 15 ohm 8-25 Adaicra 'Hi-Ten' loin MEWMART ^ELECTRONCS Adastra 'Hi-Ten' loin 10 watt wate 8 or S 15 ohm 3-1 ' 60 Also AUo Sin 83 ohm spoaker speaker 0'" 0-1 2iin 8 or 6<4 64 ohm speaker WHARFEDALE SPEAKER WHARFEDALE SPEAKER BARGANS Denton Dencon pr Deneon Demon 2 pr ll' OO Linton Lincon 12 pr Glendale 3 pr '95 Kin,sdale Kingadaie 3 ea ,95 Dov e ~ale 3 ea. 44 ' 95 Dovedale 3 ea KTS Union Linton 2 pr, pr '95 Glend.le Glendale 3 pr Dovedale Dov. d.le SPEAKER CABNETS N SPEAKER CABNETS N KT FORM (Teak Veneer) t2in 12in Bin Sin)( x 6ln 6in (8 (B 5 or 7 X x" 4 cutout) 2-50,50 4in.. x 2in 12in x 9in (10",8 (10". 8 x 5. 5, 8". 8", 6}" 6i" A & Si") 3t") 3-75 ) 18in 8in x Jlin llin x 9ln 9in (8-xf-or (8" x i" 13x8) x llin 22in x 14m.. in x x9in Bin (1 2" & i" or 13 x 8) 6.2$ (12* A i~ or 13 x 8) 4-25 TWEETERS A CROSSOVERS TWEETERS & CROSSOVERS EM 34" 3t" c/magnet c/ma,net in 3 or 8 ohm 1-15 ' 2$ Cone Tweeter 10 watt Bor 8 15 ohm. (K200S) (K2006) Cone Tweeter 3 watt 8 ohm (K3003) (K2001) 155. Horn Tweeter B 8 ohm (K7007) (K2007) Dome Tweeter B 8 ohm (K20) (K2011) way Crossovers (CN23, (CN1l. Ch428, CN18. CN24) CNl6) way Crossover (CN38) 2 75 GBOO G800 G800H GeOOH G800E GS00E SHURE MHG M44G M55E M75ED M75EO Type 2 MJSEJ Txpe 2 VS Type 3 VllVW 1 1 ' 95 1 ' 95 6 " 4 ' 95 6 ' ' 95 1' '95 8 ' MCROPHONES UD30 50K/600 50K/6OO ohm uni-dir. ball ban metal 5-95,95 UD $ Condenser Mic. Mc. 600 ohm uni dir uni-dir 9-50 Cassette Casse"e Stick Mic. with R/Conerol R/Control ' ' 60 Mic-Mixers Mono/stereo AKA ADM ,95 HEADPHONES HEADPHONES Rote! Rotel RH RH RH Koaa Koss K7 K KR07 KR ' K K6UC K6LC ' K0727B ' ' 00 K0747 ao-rs HV PR04AA ' PROS4 PR ' 95 K6tCQ K6LCQ 24 06' CO 00 Sansui 5510 SS Headphone "Headphone adaptor (Junction box) extension lead 21t curly 1'35 extenaion lead 21t curly 1-35 CASSETTES C40 C60 C90 C120 Low Noise 35p 4Sp 55p 3-way Crossover (CN38) 2-75 Philips SSp 75p Qp Memorex 4Sp 79p UOp 55p CARTRDGES &STYL& STYL! Ampcx (360) 45p 5Sp 70p 99p 0/0 Ampex (20-20+) 59p 6Sp 99p 35p Cart. Styli ACOS Chromium GP9/2SC or 3CS Dioxide 99p 40p later, comp) i Caaette Head Cleaner 45p GP93/ or 95/1 Ampex Head CleancrDemag l -65 alar, cryst- BB Stereo Teat Cassette 2-15 GP94/ or 96/1 Caaaeete Racks (hold 6) 0-45 sler. ceram. Cassette Rotating Racks GP10 cryac. (hold 20) 3-50 camp, Cassette Carrying Case GP04 iter. (BS) (hold 12) 1-60 ceram, 1 6-Track Cartridge Blank* BSR C40 C64 cao X5M orxsh Ampex 60p 9Sp 1-10 cryac. comp. 8-traek H/Cleaner SX6M or SX6H Demagnetiser 1-9(1 cryac. seer. 3 8-track Carrying Cases SCSM tter. ceram.) (BB) 1-45 SONOTONE 9TAHC or TAPES A CASSETTES 9TAHC/G Stnd P DP Cases (Olam.) 5" SSp 4Sp 06 20p 3509 Magnetic 5!* 45p B4p 1-35 Sp AUDO TECNCA 7" 80p UOp p AT5S High EMPRE 999 REX 3 S- requencyampex _.40p 5Sp GOLDR1NG 7- l-9flp 2-9Sp GBSO J AKA Metal Reel 7' 1-99.ALL MERCHANDSE FULLY GUARANTEED. Mail Order Dept BS Belmont St, Monton, Eccles, Manchester. Tel: CALCULATORS Scientific SNCLAR PROJECT 80 CALCULATORS Sinclair Cambrid,e Cambridge Build Scientific 29 ' 95 SNCLAR PROJECT 80 Stereo Pre-amp. 11 '- 95 Active Filter Unit Z"O Z40 15 watt Amp 5-45 ' Z watt Amp 6' 4-95 P2S Power Supply for lor 240 HO 4-98 ' P26 Power Supply for lor P28 P2B Power Supply for lor FM Tuner '95 StereoDecoder 7-45 ' Q6 Speaker 7 10 O6 Speaker 7-10 PORTABLE RADOS PORTABLE RADOS Vega Jade 5-75 Veg> Vega Zircon Vega Ve,a Sapphire 7-S 25 Vega VEfiOfi VEF ' Micado Mieado LM/MW/FM/5SW LM/MW/FM/SSW ' Murphy B831 BB33 MW/VHF ,95 BA818 BAB38 LW/MW/VHF M/B. M/Bact tt MA5003 MAS003 Head Set Radio LW '95 Bush VTR65 LW/MW/VHF VTR17 VTR27 LW/MW/VHF S VTR78 VTR7B VKF/MW/2SW/ VHF/MW/2SW/ AR M/Batt M/Bate VTR 175 LW/MW/VHF VTR88 LW/MW/VHF/ 2SW M/Batt M/Bate ' BYS66 LW/MW/VHF 14 ' 95 BY566 LW/MW/VHF CLOCK RADOS Bush CR28 CR18 LW/MW Bush CR232 MW/VHF Murphy MVS600 MW/VHF ' CASSETTE RECORDERS 1),60 14 ' 95 CASSETTE RECORDERS Murphy BA ' Bush TP66 M/Batt M/Bau Murphy BA200 BA100 M/Batt M/Bate Bush BT8504 (miniature) Bush BT8504 (miniature) RADO CASSETTES RADO CASSETTES (Haina/Batt.) (Mainl/Batt.) Mieado Micado 8155 AM/FM 2S-9S Murphy BA209 MW/VHF Murphy BA2B9 MW/VHF STEREO RECORD PLAYER STEREO RECORD PLAYER A & SYSTEM Bush SPR58 SPRS Bush SPRS ll 50 Bush A100S AOOS Hanimex H0- HO Hanimex HRCS060 HRC5060 B-track 8-track AM/FM/MPX + Speaker AM/FM/MPX+Speaker CAR AUDO CAR AUDO Bush Car Cassette.. BT858 BT8S Hitachi Car Radio WM702R LW/MW KM50 KMSO LW/MW/VHF tll'50 Hitachi Car Cassette C '00 C L ALL 17EMS TEMS SUmCT SUBJECT TO MANUFACTURERS NCREASE AND AVAfiAaniry AVALABLTY PERSONAL CALLERS WELCOME Manchester Shudehill. tel Leeds 4 New Market St tel Liverpool 15 Whitechapel tel ^ 900

35 \ \,'d~ ~(ON ~~ / PARTS PART 2: THE CaiMTROLLER CONTROLLER "~./''. / ~ ~ OF.GoRAYERG3OGR FG. PAYER G30GR A A MODEL Control Licence is obtainable, with- with, out difficulty, on application, see panel, allow- allow ing operation in two bs 26'96-27'28MHz MHz SMHz. 5MHz. Transmitting equipment for the 27MHz b is easily built the transmitter t'ansmitter des- des cribed here is for this b crystal controlled to ensure the frequency is within the h. b. The limi- limi tation on power is easily met since the circuit used is incapable of exceeding the power permitted. The type of emission A2 (modulated carrier) also falls within the licence conditions. The transmitter may be used with a receiver of the type described in Tart Part 1 hut but both transmitter receiver are compatible with commercially made equipment using the same mode of control. Equipment of this type is intended for the control of a l model, model boat or plane. SYSTEM OF WORKNG This is a single channel of control to the model, with the equipment outlined in Fig. 1. The transmitter is h held, with a push button which forms an on- on off switch. Signals are radiated from a telescopic aerial picked up by a short aerial on the model. The received signal closes a relay which in turn switches an electrical-mechanical device, termed the actuator, on or off. The actuator fitted in the large model boat used by the author allows switching on or off, or reversing, of the main propulsion motor by short blips. Turning the rudder to port or starboard is achieved with long blips, the rudder returning to straight ahead with no signal (transmitter button released). The boat can thus be started, stopped, turned either way, sailed straight ahead or astern. The transmitter described here will operate with tone-controlled super-regenerative receivers. How How- ever, the receiver already described is crystal con con- trolled since this has the advantages of stable opera opera- tion on the required channel without the need for constant re-adjustment as well as freedom from in-. terference by other radio controlled transmitters on adjacent frequencies. Control Transmitter ---;r---z... Radio link lam oml Radio link T Fig. 1 j; : Simple simple illustration lllusiratlon of the n fl system of working employed in n this hls series. TRANSMTTER CRCUT This is shown in Fig. 2. Trl Tr2 comprise the RF section while while' Tr3, Tr4 Tr5 form the tone modulator circuit. Trl is the crystal controlled oscil- oscil lator, the collector circuit being tuned to near reson- reson ance by the adjustable core of L. Ll. This osciuator oscillator cir- cir cuit proved to be reliable, with no critical adjustments required it gave a good output. The coupling winding L2 applies drive to the ampli- ampli fier Tr2 whose collector coil L3 is also tuned. The coupling winding L4 energises the aerial. This circuit is designed for a 48in. telescopic aerial which is easily obtainable does not prove to be unwieldy with a cl h-held transmitter. ~r-----~ ~~'~ -! T T V R1 56k R4 4 7k R5 47k R6 47k T C8 CS C7 1 O 047~F 0-CM7pF O 047~F 0*047fjF t t. )-1pF (2000 Tr4 BC107 <R7 >4-7k R7 4 7k 1 < >Ra 47K RS 4 7k Tr5 BC107 -C6 4700pF 51 +9V Fig. 22: : Complete circuit drcuit of the five ftve transistor Uensistor transmitter. Tr3 Tr4 form the tone generator, with the. single channel receiver described, the frequency of the tone is not very important. Tr5 is alternatively driven in out of conduction thus modulating the amplifier Tr2. This method avoids the need for a transformer or other components for modulation purposes. The circuit is intended for use with a single PP9 battery which is fitted in the case. A 20in. aerial on 1 901

36 'imtm c^- '! '1: >,,!? a s^«crystal FREQUENCES f a super-regenerative super-regenocative or tunable receiver is to b be used with this transmitter any crystal in the 26'96 tc o 27'28MHz 27-28MHz b will be suitable, as the receiver can be adjusted accordingly. For the receiver described in Part 1 transmitter receiver crystals are obtained as a pair the difference in frequency between them corresponding to the in in- termediate frequency of the receiver. For the re re- ceiver, this difference may be 455, 465 or 470kHz. The crystals actually used were 27'005MHz MHz for the trans trans- mitter, kHz 27'460kHz for the receiver. However, the selectivity of the receiver plus crystal control per- per mits the working of a number of transmitters with with- out interference pairs of crystals for various channels are obtainable. Provided transmitter receiver are working colj'ectly correctly together a change of frequency would only be needed where two or more models are used to- to gether the transmitters chance to he be on the same or adjacent frequencies. a i-s3 iisl..'.. ) f The front cover of the controller box s removed to show the Uansmlller circuit board. The front cover o{the control/er box is removed to show the transmitter circuil board. the receiver equipment at ground level was found to give reliable control easily in excess of 100 yards which was well outside the limit at which it was wished to observe sail the model, even with the transmitter aerial not fully extended. t should be noted that it is possible to increase power by increasing the battery voltage, provided dissipation in any stage does not exceed 300mW. Radiation may also he be increased by placing a loading coil between pin 3 on L4 the aerial, space is left for this on the circuit board, though it was not required. Note that the push-button push button S gives complete on-off on off switching of the transmitter so that no other switch is required. Where a single channel tone is used with a super-regenerative super regenerative receiver it is usual to leave the transmitter RF carrier on continuously, to reduce the receiver response to interference or spurious opera- opera tional signals. Should the transmitter he be used for this purpose S should key only the modulation tone sec-. tion, Trl Tr1 Tr2 operating continuously, an additional on-off switch being fitted in the battery circuit. 902 The finished circuit board which should be tested adjusted before fixing H nto the case. The {inished circuil board which should be tested adjusted before fixing 11 nto the case. CONSTRUCTON The board is about x 2 1 4m. 04in. both sides are shown in Fig. 3. Drill holes for the crystal holder tags, for two bolts MC which are necessary to mount the TAKENOTE TAKE NCTE The use of radio for controlling a model is per- per mitted only under the authority of a licence issued by the Home Office. Qffice. This authorises. the use of At. A1,. A2. A2, Ft F2 emissions in the fre- fre quency b to ' 28 MHz with a maximum effective radiated power of 1-5 t 5 waffs watts in the b '5 to MHz with a maximum effective radiated power of '5 watt. The licence authorises the use of the apparatus anywhere in the UK s is valid for five years. Applications for the licence should be sent to: Home :-Home Office Cffice (Radio Regula- Regula tpry tqry Division), Waterloo Bridge House, Waterloo Road, London SE1 SEt 8UA aua together with the fee of t 50 NO, EXAMNATCN S REQURED. f -50 NO EXAMNATON S REQURED.

37 'SKN _ a, \ / Wi ^ *«> ' 38»5^ 3»»-..-- theres Doram, you Now there's Doram,^ need never nene' eleclronic wait for electronic components. 7-day 7 service. And so confident of our BuythenewDoram service senice thatifwe it can't con'tsupply catalogue you could hove have thepartyouwantwithin7days within 7 your components within 7 days of receiving yourorder,we'll order, of our receipt of your order. give you your money back. f you don't,you'll have mmediately. your money back no No-quibble guarantee. questions asked. t's just about impossible What you won't get is to buy a defective part from us. a tedious wait. Which goes on. Becouseourchecking Because pur checking isso so. And on. And on. And on. pains-taking. You know just where you are But even ifthe unthinkable with Doram. does happen- you're Millions ions of components. unlucky-then we'll still make Doram is a br-new you happy quickly. deal for serious amateurs. Because we offer a no no- t's a complete door-to-door quibble replacement part components senice service operated senice. service. by mailorder. And our guarantee is You buy the Doram g guaranteed by the fact that catalogue for 25p (that's a we belong to the biggest yearly reference book forthe electronics distribution Group price of a pintl pint) then you in in Britain. orderfrom it. it. All bred goods. We're big enough to to All goods supplied are offer you stocks of of millions of of bred goods.made by big big- components on over 4,000 name manufacturers like RS, product lines. Mullard, Mutla rd,sgs-ates, Ferranti, Siemens etc. Doram brings the amateur a the sort of service Nice only professionals have enjoyed. before. So don't delay. Use the coupon. Send today for your. first Doram catalogue.. t can make your life a whole lot easier For 25p that can't be bad,con bad,can it? ENCLOSE 25p~ PLEASE SEND ME THE NEW DORAM CATALOGUE. Name Address..... M Doram Electronics Umited, limited, Z POBoxTR8, POBoxTRS, H Wellington Road Rood ndustrial ndustriol Estate, Esfafe, [ Wellington Bridge,Leeds LS12 LS22UF. 2UF 'This 'Thls will be be refunded on on orders of 51less iless VATl VAT1 or or more received _... by by coram _--_ us us before before March March 31st, 31st, !

38 904 S-fU WLMSLOW AUDO THE Firm for speakers! SPEAKERS Goodmana Goodmans BP 8P B or 15 ohm 5' 00 Goodmans10P 5 ' 31 Baker Group 25 3, S or 15 ohm Goodmone 1'75 Goodmans l2p 8 Baktr Baker Group 35 3, 3,8 8 or 15 ohm Goodmana 12P 10P 0 8 or or ohm ohm t SO 12 ' ts Beker Saker Group 50/12 08 or 15 ohm Goodmana Goodmans12P O 12P-D or 15 ohm iltl n 12' SO Goodmans12P G 15 Baker Saker Deluxa OeluX81r 12 - d/cona Goodmana d/con. ts'7s 10 '75 Goodmans Audlomax 12AX watt Baker Bakef Major.. Goodmana t2p-g Audlomat 8 or S 13AX ohm 100 wad to t SO 17' se Biker aake, Reoant Goodmana Goodmans Audloma* Audlomax 15AX Regent 7'75 4"15 Goodmans15P 8 Baker Bak,r Superb Goodmana U se 1:21 ' " Baker aak'r AudHarlum Auditorium 12 Goodmona S? B or 19 ohm 12' se UP a Ut Goodmans Mldax Celeelfon tlon MHTOOO MH1000 horn Goodmana Mldai SP 0 or ohm O ' ts 11 " Goodmans 100 tweeter Celaetlcn.. PSTS PST8 for Unllo* Unllex a ss Goodmana 7'25 Goodmanl 12'" Celeitlon CeleaUon G12M0or15chm Goodmana Axent lciotweel«e tz OO Z' OO Celtillon G12K G12H 8 or 15 ohm Goodmona Audlom Goodmanl Axiom " 12" 12'" 17' 25 15' 00 Goodmans Twlnallom Celeitlon.. G1SC0 G15C 8,,, or S ohm Goodmana Twlnoxlom 8 t zs 24 '00 Celeltlon G18C 8 r SS... Goodmans Twlnulom Coleitton GlflC 6 or 15 ohm Goodmana K.f Corel 51"d/cone roll eurr. 8 ohm g~~:1 :1~1~~~~ r!.~~[.ri 8oh~ a so Kof T27 TwnaxlomlO 5'ZS KefT15 Corel ft^d/eone roll eurr, B ohm Kat T15 U ' ZS 1'" EM EM13 13x0 x 83. 3, B 8 or 15 ohm Kof Kef ZS ' 25 EMt EM13 13* d/c dlc 3, 8 Or 15 ohm so Kof B t s EM113 EM13 x /lw t/tw 3. 3,8 «or 15 ohm a 7S Kef ' 25 EM EM13 13x0 x type 350 B 8 or 15 ohm Kal Kef DNB DN8 t'25 z.. EM113 EM13 * x 8 20 wait watt baxe Kof Kef DN12 4 ' ts ei" Kef 1' 00 3'S. EMfCr 83850a or S ohm Kof DNZ DN13 EM STC4OO1 G super tweeter 5" flbt32cp 98132CP 8 ohm a so STC4001G tt CG8T awd/e rlsu. EM EM.8 0x5 le 5 d/cone, d/eon roll eurr aurf 10 wall Richard Allan aupcr CGBT iwoetar a "d/c r/auir. wau a se 1' S5 EM 21" twaatir lweeter AT AT.5 2J" ~t: ~ :~:, 80 ohm. a ts Eaple Eagle DT33 30 wait watt waeter 21" ohm, ohm 70mm 80 ohm, 70mm 8 ohm tweeter S 'U. 5' Eaolfl Eagle HT15 HT1S horn weeter... 4'" Eagle CT5 cone 1 ' 15 5'" a Eaole CTS cona tweeter 8" 7" x * 4" 5" 3 or or B ohm ohm 1 ' 50 Eagle tweet.r en 3, Eaole CT10 tw«et«r 8 or 18 ohm 10" * 8" 3. 8 or 15 ohm Z'S5 z S Eaplo Eagle MHT10 horn weeter tweeter... Eaalft eagle crossover CN23, 1 ' 5. Eagle croseover FR4 CN23. CN28. CN216 SPEAKER 5'31 KTS Eagle FR05 FR65 t SS Baker aaker Module.. 11 ' 11 Eagle FR8 10" 5 Fane Modo Malor Mode One Modula aach each C1B-79 Cf.... M Etoc Elac 0x5. 9 l 5, 59RM Ohm. ohm. Goodmana Goodmanl DN 20 at aach.. Ct t -73 '1S 98RM114 5RM14 08 ohm 'l Hetme Helme XLK 25 pi pair palr ZZ 22 t H Elac 81' &1" flrhlt 6RMf71 d/c dlc roll surr. aurr. S Helm. a X.K 30 pa ptfr 14 -' S Elec «'6RM220 d/cone a 1S Helmo Helm. a. '.5 Ebc ~::~ 4 '~!:~~TU,c:"e weeter TW Kaff1l2 XLK 50 Kofllt2 aach pal pair.ach a4-75 '15 n Elac lo" 10" d/cone d/conel0rm239 10RM239 B 8 ohm.s Kofllt 75 Etac Elac 8" BCS175 8CS1753 ohm a so Richard KolTl 3 Allan TwFnkll aac. aach Twlnklt oa.. each 31 '75 1' S Fano Pep POP 15 watt 12" 4... Richard Allan Trip TrlploS Fa 8 tac.. each Fane Flna Pop PoP 25/2 25 watt wait 12** 12" 1 15 Richard.ach tt ts Fono Fane Pop 40 watt 10". so Richard Allan Allan Super Triple TrlpTo bbc Trlpls «achcs each.ach a3' 15 a Pop PoP 50 watt ir 12" tt oo Wharledale Wharfedalo Union Llnton 2 kit pe pair 19 U' 23 ZS Fane Pop POP 55 12" 60 wall watt 12 ' so Wharfedate Wharfedale Glendale kit 31 ' t Fana Fane Pop PoP 60 wall watt 15" 13'00 Wharfedole Wharfedale Dovodale GtaleSklt Oovedale 3 Mt kit pair 34 pair SZ ' SO Fano Pop POP 100 watl watt 18" t22 so Fane Creacendo Crescendo t2a 12A 100 wall watt 12" t21 00 Fano Fane Crecconde Crescendo 12B 128 bsis baas t21 00 PA/DSCO PAjDSCO AMPLFERS Fano Fane Cre>condo Crescendo 15" 15'" OC 100 watt (carr. ns. 1) Fano Fane Croecondo Croseendo 18" 18'" 150 watt 4. so Malor 100 watt Fano Fane 601T BOlT 6* 8" d/c roll aurr. Baker surr. 7'00 4" Fano B07T 3" 8" d/c di e roll rollluh. eurr Linear Major 30/40 1M wall «<f H S'15 40/60 Fane 15' T a" 8" d/c Linear 40/ de a '75 Linear Fono S'S Fane 701 twin ribbon horn Unaar os oo Linear la'll... Fano BO D10 horn Lnesr 80/ watt alaxo CM 44 OS H Fane 020 D20 horn SS. 00 Cbco Eagle PA range in n atocx aak stock-ask for catalogue. Free with speaker orders over 7 7- "Hi Fi "Hi-Fi Loudspeaker Enclosures" Enc:losures" book. All Ali units ouaranteed guaranteed new perfec:t. perfect. Prompt despatch. despatc:h. Carriage packing: speakers speaker* 3Bp 38p each, speaker kits 75p 7Sp eac:h each ( 1.50 pair) tweeters crossovers 20p. ALL PRCES QUOTED NCLUDE VAT. WLMSLOW AUDO (Dept. PW) Loudspeakers: Swan Works, Bank Square,Wilmslow, Square,Wilmstow, Cheshire. SK91HF Discount Radio, PA, H-F: Hi F: 10 Swan St. Wilmslow Send stamp for tree free booklet "Choosing "ChooslnQ a Speaker" The best buy! 1 85 t 19 Agfa Low Noise Cassettes S7p 1.. U ' SO AT LESS THAN CM CM J7p tl M 9» SOp»P 2.4t "5 4'BS HALF PRCE! cue tip i9p.'. J'T M20 CM+ 1 f 10 1 / SUPER c, ' +, "e Mp "".,# C130 Hp WK tin 5. AGFA HGHDYNAMC C p SUPER C CM Up 4tp u 3i5 ss H ECM C120 1«P Hp 4 C4'M... " AGFA STEREO CHROM STEREO-CHROM 5 CO CiS 1 J 3 4 Z0 }3 J", 10 Sp 4 > CHROMUM DOXDE CH 1' 'H CHROMUM DOXDE c» C aci ein 5» 10-M "oh \, SA~E SAME DAY DESPATCH. DESPATC:H. P. & A P. Sp t5p per p.rmd.r order WLMSLOW AUDO ""'itl... il~ (DEPT. PW) 10 SWAN STREET, STREET. WLMSLOW, CHESHRE, SK9 1HF Cut-price Cui-ptice prerecorded cassettes-send cassettes send stamp for list Wire Wound Resistors. Our selec- Wire Wound Resistors. Our selec tion of mixed values. 30 for for Audio Amplifier Module. Mullard LP1173, LP1173. output power, nominal 10 wait, watt, supply voltage +24 volt, wilh with data circuit, Ferguson Stereogram chassis Model3357, all transistor, medium lono. long, VHF/FM.3 3 waits per channel S/M.with connection data. data, less tuning scale, 20. Crystals HC6U: MHz: 52 '02500;: 52 52'01667: 51 51'56667: 56657; : 51'58330: ; 37'76250: 37 37'75000: 75000; : ; '8: '6: ' 700'0: : 9'458'33: S : 9'456 25: 99'455'55: : : : '94-94 ;: ; : ; 9 090'62: ' 5500 SOp each. Elecfrolytics. Electrolytics. 32/32/32/jiF. 32!32/32/"F, 325v. 2"X. 11" 1,' 35p; 35p: 80»F BO" F 150vS 150yt U" f" x 1" " 20p; ; 2000,.F 2000" F 30v, 30y, 2i" 21" 1" 25p: 2000iiF 2000"F 35v 3";-1* 1" 30p: "F o F QOv 100v 3~ 3" f H" 25p: " 2000;<F F 25v 2'rW 2" 1 t" 35p: : 30,O00uF 30,OOO" F 25v 45 4," 25" 2," SOp. : TOOrrF 700"F 200v 35" 3,". 1i' H" 30p: : 16.16pF 16"F 27Sv 275v J-Xl" lr 1" 20p: : 40140/ 40.40; 20sF 20"F 273V 275v 3"yl" 1" 20p: 4SOO,900;900nF 4500,900,900"F 30v 25". 2!"."" 15' SOp: : 4000uF 4000"F 35v 3" 3" -f 1 f' 40p; : 4000i'F 4000"F 35vt 3" - tj" t'' 35p; : 2SOOnF 2500i,F 40vt 25" 2, " 16 15" 40p: 4000«F 4000"F 18v 2" 2" 1" 1' 20p: 470iiF25v 470"F 15'> 1l";. 5",.. 15p. Matched pairof bookshelf speakers. Teak T finish, size 12";;8" :S". 5". 88 :55 8" ohms ceramic, 5 watts waits RMS. Complete with din leads pair. Thorn TV F chassis, 950 series (less valves), lves). 1 '75. 7S. UHF625transistor push button tuner (NSF Telelunken) Telefunken) as used on Decca D MS2400. Br new boxed. boxed, Light Dependent Resistors (RCA ) sq3536) 30p each. h, 4 lor for P-C p.c Boards (not computer panels) of) oft 6 transistor single wave b. 1 ofi4transistoraudi0.1 oft 4 audio. 1 off of! 3 transislor transistor 1 1'60, -60, three boards. Rank EVR Telepiayer Teleplayer colour trans- trans lator panels, type components on new panels listed as follows, 2-50, 2'50, each panel Z of! 8C148: BC148: 2 RCA ca3054 (ic); (ic): 1 crystal c ' MHz-Z MHz Z off oft 60143: BC148: 1 BC108: 1 T BC'58; BC158 : 1 RCA ca3046 (ic), 1 RCA ca3045 (ic); (ic): 2608 Z off of! BC14B: BC148: 2 BC1S BC158-Z off oft ME4103; ME4103: 2 BC- 2518: B : 1 BFY50. Mains Droppers, 10 mixed values. lues, 100. Edgewise Level level meters, 200r>A, 200"A, size }" r overall. SOp. Chrome Plastic knobs, 3 types, 4 ofi of! each h with spring clip. clip, 1 ' Aluminium Chassis, 75">:55"X2}" 7t";.' 5.,."'< 2*" 70p: : lo-xti'xzr 10 " 7,.. 2,' 85p. 11">;7i", 11";-7t". 2<" 25" 95p. BSR PZS, P128, similar to HT70 single play, with heavy die cast turntable, less cartridge, ' 00. Transistorised FM tuner head, with A.M. gang, slow motion drive Mcs, Mcs. with circuit diagram, Ferguson Stereogram Chassis. MW/ LW. LW/VHF with tuning scale (5+5 walls waits sine wave) 15 ohms SO. 15 ASSORTED SWTCHES way to 7 way TAG STRPS AlMA ALMA REED RELAY TYPE ORH. DRH. 3 VOLTS. SSp. 55p. REP ANCO & DENCO COLS. COilS. NEW, BOXED OUR SELECTON 5 SElECTlON-5 FOR 1.25 Goods not despatched outside UK (Post packing free in UK) 1Sp 15p hling charge on orders under All items include VAT under All items include VAT SURPlECTRONCS SURPLECTRONCS 216 LEAGRAVE ROAD. 216 LEAGRAVE ROAD, LUTON, LU3 JD, BEDS.

39 +--~:c':!p: ~ +--Aerlal o~»» TsTT-* o 1 R4 K o o o o o o S^o o «i r3^ o o o o Tr5^J)o [r frl^j)''r4 0 otr3 C o o o o o o *1 o 6 o 6 js) o?) d/ y y w y oooooomotamm o t> o o o e e Trbj-* e OOOOOOOOOOOOOQOOO o o o CP) ooooo*o«oj»f* ffij ooooooooo, o~: ~c~c~~c:q~~~r. C4 8 O 3\ff O 03~O o 2 ~ c60 C6 0 Jj-t 0 h - b 1 O 0 ^Tr2 c O ~ L1/U2(^l L1/L2 ~ 0 R X1 L3/L4JL o 0 o 0 o 0 o 0 o 0 o 0 02»^ 1 1. CT c oooooooooo~ 0 lc.tr1-tr5 2%' 2g,e x 2V 2Y4 4 " perforated board <0-15'matrix) (O 15'matrix) e c. Tr1- Tr5 perforated board 3 Tr1 ~ board as possible, wind on 14 turns close wound apply a little quick-drying adhesive. Take the end down through hole 2, scrape the wire, solder to C3. L2 is wound in the same way 4 turns, immediately alongside L. Ll. The beginning of L2 goes through hole 4, the end through hole 3. L3 has 17 turns in all, Begin at 1, against the board, wind 8! 1 2 turns, scrape the wire, twist to form a loop solder for the centre tapping CT. Wind a further S8 1! 2 turns in the same direction cement end 2. L4 is 5 S turns of thin insulated wire, such as 22SWG connecting wire, wound on top of L3. Take Tal<e the beginning to MC the end to hole 3, across the board, up as shown for the aerial connection. A connection can now be made to CT of L5 L3 end 2 can be connected to C5. CS. A few spots of adhesive will keep L4 in place- place. Fit a flexible lead from R7 to the push switch S take the second switch tag to a further lead, with a battery positive clip. CASEWORK kr 02 * f \ 2 1 c j- The transmitter is intended to be used in a metal i'l3vi_i_ case which is held in the h. The case is made from ' ' X ^ C'6. b 3 Lky- Trllb i_i, a 6 x 4 in. universal chassis with an additional G 6 x 4in. plate for the back. The 6 x 2 in. sides 4x24 x 2 in. top bottom are assembled with bolts the front plate is similarly attached. Drill this plate to take the C4 031 { R3 R2 bolts of the circuit board hold the hoard board about ^! 1 C1 ; ; JS) 5 3ain. fl clear of the metal using spacers or extra nuts. Fit S to the side of the case so that it comes readily to finger or thumb when holding the case. The aerial is ^ /f\ <e * R5 5 - fe - fitted to the opposite side, near L4, insulated l b A ^-C8- ce-*-^b from the metal case by insulated bushes washers,,1 yfl fir Tr^Ni or by using two pieces of 'Bin. lain. thick paxolin, one for Tr3 each side of the metal, with insulating washers be- be tween to prevent contact with the metal. The simpler -R4 4 ^i c type of telescopic aerial may require a mount formed from scrap metal, in which it is a sliding fit. Some Fig. 3; 3: Constructional nformation information for the circuit board, the winding aerials have a bracket of this type already provided. details for the colls coils being shown below. The battery occupies the bottom of the case a a: small bracket on the back plate holds the battery in position. 3 4 turns 4 iavjturns ~ Y turnj 5t~ '- ' ~CT L3 4 (wound over J 4 (wound over 8~turns centre of L3~) L3) i ~~~---:;1 Note: L1.L2 L3_ 32 swg enamelled copper wire, close wound. L4..22swg nsulated connecting wire,close wound. Note: L1,L2 L swg enamelled copper wire, close wound. L swg insulated connecting wire, close wound. ' board provide a return to the metal case, holes to give a push fit for the coil formers which are also secured with adhesive. Position items as shown in Fig. 3, turn the board over solder finally snipping off excess leads. Sleeving is put on all wires which may touch other wires or joints. Connections should be short direct in the RF section. t was.found best to wind the coils when the formers have been cemented in position. To wind L, take a length of 32SWG enamelled wire, scrape one end, pass this down through hole 1, Fig. 3, solder it to C, Trl. Draw the wire taut beginning as nearj the * components list Resistors ;;' Rt R:,. 56kfi 56k~ ; R5471\O 47kO. R2: mn 'FW R6-47kh 47kn. R R7 4' 4-7kn 7kO R4 "~" 4-7kO 4 ' 7m 'R.8 R8 4' 4-7kQ 7kn All 1W tw 5 or 10% '7'/ j :i~;-:~'-~ :.'.?;-~~'i-' >,;'~!.. <~. "' Capacitors ". C1, 470~pF 4700pF dis.c disc ceramicc5 15pF tub ceramic C.2 C2 :)33~f'tub 33dF \c,eramic. ceramic.: C6 C5 470QpF 4700lFdis<~eral'l)ic disc ceramic cerar 'C3 0' 0-1/iF 1jLF disc ceramic. C7 0' 0 047f1F {)47/<F 047/i F... C pF F ceramic.' C8 O'P47f1F 0-047;.F 0-047;<F ~~"l';' ~. -:,.. ~_. ~;- '<i:.,..'-'.'"'0,'-'.. :' Semiconductors.:' Tt1/~ Trl/2.; ~f:19~ BC109 :.,,,. <' Tr3/4/5, 6C107 BC107 Niisi:~nan Miscellaneous 'eous : ' :,..'.... Coli Coll ' for,mers, formers, :4rrll'n. 4mni.,with /Gores.'cores (4). Crystal 27MHz; 27MH2, see text Part 1. 1, Crystal holder hoider type HC6U.,.Gase6 Case 6x4x2in. *,4 x with, extr", extra plate 6x4in. x (Home Radlo) Radloj.-Telescoplc ':Telescoplcae'rial.',Pushswitch, aerial.'push switch, normally qff off.... V!!(ob~~rd Vefoboard 2i'x2t 21 x 2iin. in. 0'15in O-lSin matrix

40 TESTNG The transmitter should he,be tested provisionally tuned before fixing it into the case. Connect a 9V battery placing a meter, set to the 100mA range, be- be tween battery negative one of the bolts MC. Tem- Tem porarily take the aerial lead to a bulb holder, one side of which is returned to a bolt MC. Fit a 6V 0-04A O 04A bulb. With S closed, rotate the core of L Ll until the meter current begins to rise. When this happens, ro- ro tate the core of L3 while observing the bulb- bulb. Tune L5 L3 L Ll for maximum brightness. Check that the oscillator starts when S is opened then closed. f it does not, re-adjust L Ll core until it oscillates every time. With optimum tuning, the bulb should light quite brightly. To check for the modulating tone, use either the monitor, of Part 3, or receiver. Alternatively, connect a pair of headphones to a few turns of wire, with a diode in one lead, bring this near L3, when the audio tone should be heard strongly. FNAL TUNNG f the aerial is dosed closed L Ll L3 are adjusted for best brilliance of a 6V 0-04A O'04A bulb held temporarily from aerial to case this will probably give all the range required when the aerial is subsequently ex- ex tended. However, more accurate tuning s is possible with a field-strength indicator or monitor, Part 3. This is placed a little distance from the transmitter tuning adjusted for the best reading obtainable. The aerial should be fully extended with the trans- trans mitter held in the h at about chest height. t is usual for both transmitter receiver aerials to be roughly vertical to avoid directional effects., When controlling the equipment at short range, it will be found that adjustments are not critical the transmitter aerial need not be extended very far. But adjustments to secure the maximum radiated field strength are, of course, important when trying to achieve the maximum possible range. f there is any chance of a model being lost, a test should always be made at maximum range, before releasing it. Avoid letting the distance approach the known maxi maxi- mum range in case reduced battery power or other circumstances result in control being lost., NEXT MONTH WE DESCRBE THE ACTUATNG MECHANSM AND A MONTOR AND FELD STRENGTH NDCATOR. AVALABLE NOW! REPRNT OF PW s PW's TELE TELE-TENNS TENNS SERES July-November 74 Send 7Sp 75p + Sp 5p (post & packing) to: Chief Cashier (PW Tele-Tennis),.P.C. Magazines, Tower House, Southampton St., St, London, WC2E 9QX SQX TELEUSOn N 'THE FEBRUARY SSUE CRT' TESTER ANDREACTVATOR This useful useflll piece of servicing equipment enables c.r.t.s., both monochrome colour, to be quickly tested for emission leakage re-. activated as necessary. A selector switch enables " the individual guns of colour tubes to be checked compared. Two reactivation treatments are provided. pro~ \ded. AUTOMATC CUT-OFF C,UT-OFF CORRECTON One 'of the problems with a three-gun colour tube is that the guns age at different rates. This means that the grey scale should sho,uld be reset several times during the life of a tube. n the latest B B O 0 chassis however a patented circuit s is used to correct the cut-oft cut-off point point ot of each gun automatically before the the~tart start of each scanned field, thus main- main taining the correct grey-scale adjustment. The operation of oj this novel no,vel circuit will be explained. SERVCNG TV RECEVERS The next chassis chassl~,fo to be. dealt with byles Lawry- Lawry Johris Johns s is the current Decca Single-stard one used n in Models MS1700, MS MS2001 MS2401. ~: ">,~ ~'f 't TWO-TERMNAL STABLSERS A review of otthe the many two-terminal devices that can be used to 'provide voltage voitage current stabilisa- stabilisation, outlining their operation characteristics. Leading from fr,om simple diodes up to the T TAAS50 AA550 type i.e. i.c. stabiliser. sta'biliser.', ' tion., TRANSSTOR VDEO CRCUTS The second part 6t of S. George's series on video circuits faults looks at solid-state c.lrcuits. circuits- Because of the very different characteristics of transistors, circuit design the faults ex-. perien.ced perienced differ markedly from those those associated, with valves 'as outlined outiined n in Part '1. ' PLUS ALL THE REGULAR FEATURES -_..._--..., TO (Name ot Newsagent) TO (Name of Newsagent) Please reserveldeliver the FEBRUARY ssue of Please reserve/deliver the FEBRUARY issue of TELEVSON (25p) (2Sp) continue every month until further notice. further notice. NAME NAME ADDRESS ADDRESS

41 S A XO N Money SAXON Money saving,high performance audio equipment DRECT FROM OUR OWN FACTORES GUARANTEED TESTED HGH PERFORMANCE POWER SUPPLES MODULES-now MODULES now better value than ever UNSTABLlSED-READY USED READY WRED SAlS. 5'45 Car..~:,e 2SHz-25kHz Suits SA3S Carfiace SA trie _i_ + SHi-TSkHx rt.-»dr PU4C PU45 0 '1 % (4 5'45 3SW 35W RMS 25-50y k 0-2%distortion rwta Sui'm Suit* SA5Q 2 SA35 (g or 1 SA50 ohm) /C.41; tats 5-45 Carriage 30p 2S-S0V 7 cransjitori, transistors. 7 diode* * diodes Nottp 80dB Noise-aOdB Suits (8 SOOmV 20K SAOO 8'45 40p Carriacc SA '90 ^fr r ohm. free r ;«e ic 500n>V into 20 K PU70 Suit* 2 SA50 (6 ohm) or 2 SA00 hm 8-45 Carriage 4Cp ^ 4-16 ohm* SOW 50W RMS 25-65V jfc: 25-6SV Simple vrrring' STABLSED wirine 7 cr^ntittors, transistors. 7 diode* diodes *k Short end open Open PS45 pc4c circuit proof ran Suits SA50 2 SA3S SA35 SASO or 2 SAS0 (4 ohm) fa-ak 4'45 Carriaae SAOO 12'50 M 4-45 ^5 Carriage free 5 A100 12*50 Coptinuouily Continuously Transformer Carriaee (ree rated 3'50 30p foow OOW RMS45-70V raced MT45 Trtosformtrfo, Traniformer ~5-70V * Top-grade 10 crarttittori, transistors. 7 diode* ic Top-gi-ado above Carriage 3 Op diodes components componenit Ke PS70 Suits Su:ts2SA00 2 SA '45 Carriage free (ree 120 watt module complete with built- built ^ Transformer ror MT70 /Q Tramlornier Traniformer for above E4'90 4' Carriage 40p in supply extra supply-extra heavy duty 22* ^ ~o; THE SA0O SAOO MODULE N.B. PS70 is not suitable.. for the SA50 Mk 11 STEREO DSCO MXER '50 Jl- 10p Thu This well tned tried unh unit mike* mixes two deckt, decks, hle* Carr. hles any SOp ^ ceramic cartridge, cartridee. feature* features mic over-ride over ride plui plul j 1 6 separate full (ull range ranee bass treble control* controls on both vhh T f mic deck inpuu. inputs. Ample headphone power i~ available for P.F.L May b«be ujed used for mono i* i~ main* mains operated. Fitted with aeurdy sturdy ccreening screening caie- 4 case. V \ V iv o Control*: Controls: vol, base, treble. fade. volume, Mic vol. baie, treble- Left/Right fade, deck - - volume. bass. treble, h/phone select. Mains. Size!7iin 17tin x ba*t. 3in l x crebtc, 4in deep. hiphone select, vol. Main*. Site P* 1 DSCO MODULE '50 % c1"o; r ;- P Thounnds sold or version. m VA10 (see consumption Features the same stards as f:.~.~ Thouss *old of this extremely popular mono vertion. A mic input may ft^c be Foacuro* fitted using tha tamo the VA30 high stard* (lee below). of Low reproduction coniumption at the from Stereo a 9V version. battery. K^Hj 1^2 ".,u Control*; Controls: select. vol, vol, vol, bass, treble ~, matter muter vol. H/phone Size llfin seiecc, 121in X 3in vol. l x Left X 2in deck deep, vol. Right deck *of, bas*. treble, K^H deep. L ~ [ON Mgco-woante...--, 3-CHANNEL SOUND-LTE '50 %' C]U; ^ Only SAXON can supply such ncredible incredible value for money. Thf* This imtc unit feature* features 3kW lkw power hling, full-wave (ull-wave control, control. bajj, bass, middle, middle. treble AND mister master control*. controls. Twin. '. -;-' ~--2j & jacks (Or' connections. stinc panel loudspeaker mount jack* next for to either "through" of the connection*. above. Also t features may be (eatures unique used free CUT-BACK sunding eircustrr or will circuitry for (or extra wide range response. Size 2in 12in X x 3in lin X 2iin 2tin deep. Professional Pro(essional stard* stards m m m at ".. r..- a price you can afford!, ~ ~ SNGLE CHANNEL Recently reduced fr> in price ADD 8% VAT *>- VERSfON sales. VERSON 7-50 due HO ~ 88XOn 8Q~~ o_uk.. '.. ~ _ ~ hles kw. w Cirr. Carr. freo hle* to kw, increasing Full sale*, wave TO ALL ORDERS ;axor soaod lite A. (ree operation. MULT-PURPOSE MXERS a«33 i M4HL MiHL M6HL 19' %%-; CsO; '50 X'" Cs"O; FcaiurFng Featurinc multiple* multiples of o( our VA30 module, the M4HL M4Hl M6Hl requirements groups. etc. M6HL where fulfil a high the requirement* quality mixer of i* all is rcqutred. clubs, group*, required. Each channel hat has one high one low mpedance impedance input, input. plus volume, treble bau bass control*. controls. nput impedance*,mpedances be chanced. The M4HL M4Hl has may, four if channel*, required, channels, he one easily output, changed. the M6HL li* six channels (12 inputs^ inputs) a maitcr master 4 «control two output*. outputs. Either unit may bo be u*cd used frec-stamjing free-sting feed all type* or types of amplifier. panel mounted. Recommended These mixers for (or their will vcriacility versatility performance. value for (or money, high performance, excellent o money. VAW TM31 VA30 CHANNEL C~t~StEEL MODULE "/VCf) 3'50 Carr. ~::~. irte This s is the b»*ic basic: channel modulo module in the above mixer* > o o o o mixers also used (or imputs e mono may or al*o stereo be utcd mixer*. far extra mixers. Fitted imput* with on volume, either b*** the bass a,..d requires just 19 toov) treble controls, require* }u*t a jack supply (9-100V) SAXON OOW o( 00W of speech music Two music-two CSE separately controlled NEW!! inputs. Wide range ranee 100 bass treble. bats treble, SAXON MULTMX ^ r:;; control*. controls. atlractiyc Sturdy attractive vynidc vynide l00w COMPUTE COMPLETE case. Twin outputs. 100W rms four inputs slider controls plus master groups. Fantastic AMPLFER deal for group*. slider. Wide range bass treble controls. Pantastic di*cos, discos, tatted tested etc. Fully value, ideal for complete disco's, groups, clubs etc. a guaranteed. 50-Exactly 50W identical Carr. fr** SOW version dentical CSESO SAXON MULTMX 50 Exactly as above but SOW (r in in aooesrance. adpearance S0 Carr, Cur. fraa fro. rms CALLERS AND MAL ORDER SEND lop 16 MANUAL-vfull (Op FOR circuit* OUR & 26 detail*, PACE PAGE SAXON ENTERTANMENTS LMTED TERMS ~:;'~A~;f~~~;:~~:: d~~:~. C.O.D. or OF ACCESS BUSNESS! (iutc C.W.O. send n WHTEHORSE ROAD ' CROYDON CR0 CRO 2HS card ~ :; number). ~';mb ~r)~f.~~~~p Send SOp for ( }~ ~tc~o.~ C.OJD.. 'n (Please (PCJ5C quote Quote magazine when n ordering) o r d Please send S.A.E. with With all enqulrle*. enqui ries. SHOP HOURS: : 9 a.m.-s a.-5 p.m, p.m. - LUNCH p.m. MAL ORDER DESK: a,m m p.l p.m. "'J 8% must 24-HOUR 24 HOUR ANSWER SERVCE. TEL TECHNCAL ENQURES: : 0.6B brdcrt Cbrde.. including 9% mu*e,nel udln, carr, be added to all carr. charge*. char.e n 907

42 Ho. How to order the cassehe cassette unit for lor your Kempton lempton or Ascot player. As a reader of Practical Wireless, you can get the cassette mechanism for your car stereo player direct from Goldring. The units for both the PW Kempton Ascot are made by Lenco based on the famous STARR design, with wow flutter reduced to 0.3% max. All you have to do is send the coupon to us, with a cheque or PO made out to Goldring Ltc. Ltd. Be sure to slate state which unit you need. Forthe Kempton, it's Lenco FFR at 18.90; for the Ascot, it's Lenco CRV at Prices include packing, carriage VAT... Tne The units are also available from selected distributors. Lenco FFR (or for the Kempton. Robust precision engineered, it's widely used in industry by Europe's largest car stereo manufacturer. Lenco CRV for (he Ascot A Lenco CRV for the Ascot. A record/replay replay unit made to hi-ii hi fi stards. Features o( of the Ascot Player include dynamic noise reduction, reduction. auto-stop auto stop ana cassette eiection at end of play - rr::d:; L~ ;:;0:;r;:: a:: y~d=8-;-' cassette ejection at end oi play. To: Goldring Ltd, 10 Bayford Street, Hackney. London E8 3SE. Please send me: Lenco FFR at Lenco CRV at Lenco CRV at enclose PO, cheque for NAME ~~ U «W ' * & E GARRARD CT4'S' CT^S' NK MK ill STEREO CASSETTE PLAYER & RECORDER has full facilities for record, playback, pause, erase, rest, fast forward reverse wind, automatic tape end stop cassette release. Robust, precision engineered mechanism based on the "STARR" list patented design. deal for use in Car stereo cassette players, H-F stereo cassette recorders, industrial many other applications. Send cheque or Postal Orders for ( ( 18'50 + 8% VAT) (includes post packing) to: BOTHWELL ELECTRC SUPPLES (Glasgow) LMTED 431 Sauchiehall Street GLASGOW GZ G2 3LG Tel: Z Scotl's Leading Electronics Centre CJL PRCES NCLUDE PP AND V.A.T. CJL PRCES N'~LUU't: P&P AND V.A.T. ACRAL, telescopic, cm 1.20 AERAL,totoscoplc,*! v swivel, 1S-BOcm cm OAERAL,telescopic,h v swivel, 15-80cm. :1.78 "' EARPHONE, OEARPHONE,stethoscope stethoscope style,s 6 ohm dyrarnlc. dynamic. EV.OO '-.00 ~ HAND DHLL,CLBytooO,Compact precision drill.5/16" OtAND DRLL, (Leytool),Compact precision drill. 5/ 16" ~ chuck.gears lotolly totally enctosod.s/l enclosed.sl hearings. bearings " ">' NTEGRATED CFCUFTS CRCUTS P QAUDO OAUDO POWER AMPLFER(Netlonal) AMPLlFER(National) LM ~ OA-M.RADO A. M. R AO O RECEVER RECEVER(RCA) (RCA) CA3123E C nf.m.stereo OF.M.STEREO DECODER (Motorola) MCt310P MC1310P 2,60' Ol/ /C C TMER TlMER(Slgnetics) (Signetlea) NES55V NE555V 0.78 D.. L.SOCKETS ( pk of 3) 08 p;n p;n ~ O..L.SOCKETSfok Of 3) 08 pin 0.50 QWploCO.SS CKEYNECTOR, rapid connect-sing le/mu 111 pie leads to OKEYNECTOR,rapid connect-single/multiple leads to. mains.suift-ln Built-in piano sw'tchos.neon switches,neon A & 13A fuse, fuse ' MCROPHONE OMCROPHONE,ightweighl Jightwelght dynamic,remote start/stop stop ~ 200 Ohms, ohms, 10O-10,OOON2,6mV ,OOOHz,6mV evefag average Oulpjl. output ; 1.80 ~ MULTtMETER,small QMULTtMETEA attractlve^vdc-10.50,250, attractive, t,000. 1,000. Vbc-10. Vac ,250, 50,250,1,000. 1,OOO.ldc-100mA.A-15Ok. dc-100ma. R-lSOk POWER SUPPLY COMPONENTS SLCON OSLlCON BRDGE RECTFER, 100P,.V./2A P..V./2A 0.40 ELECTS OELECTROLYTlC OLYTC CAPAC TOR, 2,20OuF/50V 2,200uF/ 0.57 OELECTROLYTlC ELECTROLYTC CAPACTOR,, 5,OOOuF/2SV 25V 0,63 DSLCON POWER TRANSSTOR, 2N30S5 2N OVOLTAGE REGULATOR REGULATOR(Fairchi (Fatchid) ld) UA7B05 ua DVOLTAGE REGULATOR ( Slgnetics ) NE550A 0.80 ~ VOLTAGE REGULATOR (Signetice) NE550A 0.50 SGNAL NJECTOR produces aud'o through video signals, i exce 11 ant- serv clng amp i f le r vad EOSftel ev i si 0n9,etc SOLDERNG RON,29 WATT,(Ante*), X25,24DV, Very ^ low leokoge, 1/6" long life bft (interchangeable).. 1,85 D3/32"bil 0,45 03/l6"bit 0.45 nelemant 0.95 STAND,(Ante*), ST3.High gracie base.chrome plated spring,sponges accomodatlon for spare bita C3SPEAKEH, mlnlatlwe, 8 ohms.tcmm din «3 DSGNAL NJECTOR produces audio through v ideo signals., ~ ~ excellent-servi c i ng amp ifiers,radios.,televi sions,etc CJL CJL LTD.P.O. BOX a4.canterbury.ch 1VT 908

43 ElE[TROn SlAUE* smue * *fj..a Alan Ainslie OONE of the drawbacks of conventional flash photography (with the gun mounted on the camera) is that little modelling is possible with such simple lighting. Quite obviously it would be better to use several flashguns fiashguns all fired simul- simul taneously placed in such positions as would give the most effective lighting. Conventionally the guns are connected to the camera by extension leads which tend to get in the photographer's' ' way get tangled up. During recent years there have appeared on the. market 'Slave Flash' units which pick up the light from the main flashgun fiashgun fire the slave almost simultaneously without the need for connecting wires. Most of these units are battery operated amplify the pulse from a phototransistor to switch on a thyristor which in turn fires the flashgun. fiashgun. For occasional use a battery operated unit can be a severe disadvantage as one might leave the unit switched on for a period, be unaware of the state of the battery after storage. However, using the latest techniques it is possible to construct a slave flash that needs no battery power, power. TYPCAL FLASHGUN Fig. 1 shows the tube firing circuitry of a normal electronic flashgun. n normal operation the O' 0-01/'F Ol,uF capacitor charges to 300V via both 2', 2Mft 2Mn resistors. Closing the camera shutter discharges the capacitor 2 2M 2 2M To camera sync. '---~~ To camera '--..._ sync. OOOMP 300V 1000lJF 300V into transformer Tl. The secondary of T1 Tl produces oscillations of a few KV peak amplitude which - triggers the tube drawing energy from the looo.^f looo/,f capacitor. The purpose of the 2-2mn 2 2mn resistors is to isolate the sync connections from the tube circuitry, sparing the photographer electrical shocks when the equipment is earthed in any way intentionally way-intentionally or not. Current available at the sync terminals amounts to a few ;<A,,A, whereas the open circuit voltage is a few hundred volts. t is therefore essential if any attempt be made to draw current from the unit through the sync lead the current should be very small so that the voltage dropped across the 2, 2Mfi 2Mn resistors is not excessive. n this way the full voltage is still available across the capacitor to discharge into Tl. Drawing too much current reduces the capacitor voltage results in uncertain operation. CRCUT The full circuit of the slave flash unit is shown in Fig. Fig, 2. The current flowing from the sync lead charges C2 to a voltage set by zeners D1 Dl D2. These are lov 10V devices but the very small currents cause the zener voltage to rise by about 25%. There There- fore C2 charges to about 25V. The voltage across C2 acts as the supply sllpply for the phototransistor Tr2, which is a Photo Darlington device connected as an emitter follower. At tiny currents the 2N5777 has a good >R1 \ JfRla+Rlbfl 20M Tel i "A BC109 \ i-r >(R4a+R4b> Tr2<20M 2N5777 i KR2a+R2b)l lom Lei SR3 ^0-01uF>47k To flash To flash sync. sync, lead Fig. 1: Typlcallube Typical tube firing filing circuli circuit o{ of an eleclronlc electronic flashgun.. fig, 1: Circuit of slave flash unit. Fig. 2: Crculi o{ slave flash unll. 909

44 a; V few of the completed slave {lash unit, right. The photo-darlington transistor can be seen through the aperture at the front. Vivilar aula:lhyri3tt»r o /, : lam f/j. 3; aiove, details of the PCB actual size which must be made of Fig. 3 : above, details of the PCB actual size which must be made of fibreglass. flbreglass. Below, layout of components on the PCB together with a photograph of the finished board. degree of gain while under quiescent conditions it is almost cut off. Any tendency to increase conduction through an increase in ambient light level is counter- counter acted by Trl. 1- An increase in Tr2 emitter current would increase the voltage across R3. R3, biasing Trl further on so draining base current from Tr2. This negative ' feedback compensates for wide variations in ambient light levels. A transient increase in Tr2 emitter current due to the light from a flashgun, however, does not cause the feedback loop to operate due to C1 Cl decoupling Trl base. Consequently Tr2 discharges C2 into R3 the gate of the thyristor turning thyristor-turning the thyristor on. As soon as the thyristor switches on it effectively shorts the sync leads, resulting in theflashgun firing. The current on the sync lead falls to a very small value after the flash, as the 1000/<F looo"f capacitor is now discharged. This current is less than the hold- hold ing current for the thyristor which switches off. The recycling time of the slave unit is a few seconds longer than that of the flashgun. Normally it will not exceed 15 seconds. CONSTRUCTfON CONSTRUCTON The circuit operates with very. small currents at medium voltages. Any PCB leakage therefore, would adversely upset the operation of the unit which rules out Phenolic or SRBP board for construction due to the rather high, unpredictable leakage of such boards. Good quality glass fibre is the only satisfactory medium for this circuit. The unit is made up on a small PCB as shown in Fig. 3. For those constructors, perhaps photo- photo graphers, not fully familiar with PCB etching a reasonably detailed description will follow. To flash Sync lead) To flash sync lead OH Tr2 {Rig ^ S'* frtj")»- v ^t r1 vw iscr :R3 c2 ; L. loli (4 PRNTED CRCUT BOARD The drawings show the board full size. A piece of fihreglass fibreglass board is first cut to size with the edges filed smooth. The copper is polished with fine wire wool should he be rubbed over with a cloth moistened with trichloroethylene to remove any grease from the surface. The design of the con- con ductors can be transferred with carbon paper or by punching through with a compass where the holes 910 are to be drilled then filling in free h. The actual design is drawn on to the copper with one of the readily available resist pens or enamel paint- paint. When the resist is dry the board is ready to be etched by floating face down on a saturated solution of ferric chloride. With fresh solution the etching should take less than half an hour at room tempera- tempera~

45 This toso d lead ingbig. A soldering iron a screw driver, driver. how easily the subject can be mastered add a new f you know how to use them, or at least know one end dimension not only to your hobby but also to your earning from the other, you know enough to enrol in our unique capacity, capacity. home electronics course. This course is accepted by used usea in a large number of This new style course will enable anyone to have a real schools colleges forms an invaluable grounding for understing of electronics by a modern, practical professional training in the subject. All the training is visual method. No previous knowledge is required, no planned to becarriedout in the comfort of your own maths, an absolute minimum of theory, theory. home work in yourown own time. You send them in when You build,, see learn as. as, step by step, we take you you are ready not before. These culminate in a final test through all the fundamentals of electronics show you a certificate of success. PLU PLUS FREE. 1 Build an oscilloscope. As the first stage of your r ^ training, training. you actually build bu,ild B your own Cathode ray " oscilloscope! This is no toy,, but a professional test 11 not Carry out over 40 ji nstrument that you will need t Read, draw only for the course's course.'s practical practkal experiments experiments, but also later if underst on basic circuits. you decide to develop your circuit diagrams. We show you how FlOW to conduct knowledge enter the n a short time you will be able to experiments on a wide variety of profession. t remains your read draw circuit diagrams, different circuits turn the property represents a underst the very fundamentals information gained into a working very large saving. < of television, radio, computers knowledge of testing, servicing over buying a similar piece countless other electronic.devices maintaining'all types of electronic of essential equipment. their servicing procedures. pro cedures. equipment, radio, t.v, t.v. etc. To find out mor? more about how to learn electronics in a new, exciting absorbing way, just clip the coupon for a free colour.brochure full details of enrolment. enrolmen~. vvaa WAA brochure Brochure without obligation to:, ~ ~,BRTSH {BRTSH NATONAL RADO &.ELECTRONCS,! FREE GWTlWmM H ALL STUDENTS ENROLLNG N OUR,SCHOOL, ' SCHOOL, Dept WL/2S WLj25, n COURSES.RECEVE RECEVE A FREE CRCUT,P.O. ZJ p Box 156, Jersey, Channel sls., BOARD ORGNATNG FROM A COM-, PUTER AND CONTANNG MANY NAME PUTER AND CONTANNG MANY 5 DFFERENT COMPONENTS THAT CAN.ADDRESS 'fi BE USED N EXPERMENTS AND PROVDE. AN EXCELLENT EXAMPLE OF CURRENT, (Block caps please) ELECTRONC PRACTCE.. k -----_. 911

46 ERSN for fast easy reliable soldering u 5 CORE SOLDER DEAL FOR HOME CONSTRUCTORS Ersin Mullicoro Sol'i^rconlams a core" of non-f.orrosive llu*. inslarlly cleaning heavily oxidised suitaces No exno lluxis required solder dispenser ws A coil of Ersin Multieore Savbit Solder in a dispenser 7ft 6 in of 18 s _w_g_ (2_2 metres mm); The Solder that reduces the wear of soldering iron bits_ for general purpose work A hy'plastic reel of SAV BT.oy_ 63ft 0118 s_w_g_ (19_2 metres 011_22mm) soldering aluminium New Multieore Alu-sol flux-cored solderj n 16 s.w.g. No extra flux needed, Plastic reel holds 3611_ Supplied with lull instructions. Also available n solder dispenser. Fine gauge solder for soldering small components 138ft of 22 s.w-0, s.w.g. (42.0 metres ol of 0.71mm) O.71mm) Ersin Ersi." Multicwo Multicore 5 coro core adder solder vround wound on a plasilc plastic reel. el. Sulrable Suitable for ntricate intricate work small components. Size Size SAVBT ~ unccfli ~ii~ Fine gauge solder lor soldering small components Fine gauge a older (or soldering small components 1MH Of small components. Size For soldering line joints Dispensera of Ersin /aoi. Mullicore \M those small CTh jobe easier. LSM s.w.g, (8.4 Dispensers 01 Efsin Multicore Solder make those small jobs easier. 21flo( s_w_g _(6.4 metres ol of 0.71mm) 0_71mm) solder, specially suitable for soldering tine wires, small components componenis for KSfflj solder, Jj^ j specially botj suitable lor peyt soldering line Size S FVL lor 32p rad repairing printed circuits. NEW BB WRE STRPPER & CUTTER^ NEW SOLDER WCK Size 15 1S 36p? Fitted ttedwith with unlqur? uniquebgauge 8 gauge instantly. selector size for with hle hal"\dle locking Oevlce Absorbs solder nstanily, from tags device t.:...'!~~~ piinled printed circuits, circuits. On{y Only needs 40 (o to 50 Walt Orslae 19A lor kit Watt - " \-. easy grip hles. Spring T.V.'repairs 7ft. ' incorporaled incorporated lor for automatic v t soldering iron. Quick easy wiring or Radio use. not fl ux _ opening. Strips insjlsllon insulation from flex touse - Does 7 0lneed llx at,fl T.V. repairs 7 t, is non-corrosive. s_w_g 22mm) cables n in seconds con can also i'sv ia non-conosive. " (2.1 metres) oil8 s.w.g. (1.22mm) boused ax a cutter. Multicore Solder. be used a s cutter_ Modp[aB Model 8B.,70p, p Ersin Mulllcore Solder, Size 18 90p Size 19A 34p Bib Hi-Fi Accessories Limited, PrKdtfttinwndrfl tcrommenderfreiail excluding v.a.t. c^in Sole ii O.K is Salos r- Conco55.onaiios; ^ P.O. * Box n Home) Hempxloah. HeiK HP2 7EP frorti P, lc,, s Electrical as p a o,t.c«iioo. Hardware bub,.>ci Shops, lo chen^e n undblarnablo, w.moul notice ".end l5p P8P G.' ' F. MLWARD, MLWARD. 369 Alum Rock Road, Birmingham B8 3DR. 30R. BRAN TUB!!! 1! Tel it * Raaiilom, Re.i,tors, W ire wound.nd Curboii WJra«wound C.rbon * Captelior*. Capacitors, Silv... mic., Pape" We are Qlad glad f" to say that t s now possible lo to supply from stock the following nteorateil integrated circuits. Car*mlc- Ceramic, Polyoatar SlfvAr-mlcA, Polye.t., Etecfro- Papbt, E.ctro- ALL lytic ARE BRANDED, FULL SPECFCATON devices offered at unbeatable prices lylic "k Pr... 1/99 100/ / /99 100/ /1000 1/99 100/ /1000 Controls. Voluma, Pxs-ast, Corbon, g:~~~c::~wlr:olum. WUa, \ \ %75 1 -OZ l-t ^ * Diodes, Blllcon, Silicon, Ccfmanlum, Germanium, \5 0-\25 l-d 7445 '-t55 O-7Z Zensr Z.ner :115 l-m t , ' : it * Transfttors.SHcon, Tranalltors,Sllcon, Germanium \ \ ' :115 l-hz \Z , ' : All the unused '155 l-7z l-at etock. lha above are new unueed atock \25 0'\ \ $ \ \25 0'\ '50 We have made up packe of 21b flroe# \25 0-\ l-f ' welcht. ~~g~~~ean'a:r~ u9g:::akn~ ~~ 2~~~::~~ O-Z ts 0-\25 0-\ " contain all era a mixture dlfferanl of components n conunt, \ ' 41 from lat. la a fantastic Z \ " unrepeotable the above unrepeatable ofler list. This offer that b will n fanfastlc enable ' \ '37 0'17 a spares ' \ Sl ' \ ' 17 tiny you to fraction get t good of normal stock of prlco BDAtes price at a % \ \ \ : H05 0-'31 0' 17 To make htngs thing, even moro more nlarestlrid nteresting \ N \ TWENTY OF THESE BAGS ALSO \ \ -21 Lf -O CONTAN 0-" A POUND NOTE \ m l-at2 TWENTY 0' " WLL \ %7S \ %75 \-012 -as VERY PLEASED CUSTOMERS NDEED WJLL BE Z \ \-%75 \ And price we are a,klng? %7 0-_225 0-\ : a -fo \ -75 \ -41 Only the VS4 orko \ -50 ncluding that w«udng both ar asking bolh postaoe 7 poltage \ l-f \ a -to \ end VATi 7441, " & :11 RUlh Thla To secure the above prices, all orders for these devices must exceed 25 n total value. Price Rush your order now Ttile offer la rating s established by TOTAL NUMBER OF DEVCES ORDERED, ORDERED. Any mix may he be made. etock only ~~o~~ lr 1 made t :ral~e la unlikely to reduce ~~{ke~~c~h:turl:u:~!~: that our n surplua those day riling,hall ever For special quotations for large orders ring NOW days ba be abla of able to rising repeat prices we shall aver, NEW NEW NEW1 NEW NEW An aerosol spray providing a convenient meane means of producing any FBRE-GLASS COPPER LAMNATE number of copies of a printed circuit both simply quickly. Slngla-sidod Single-sided.... TSpsq. 75p tt. ft. Method; : Spray copper laminate board with light sensitive spray. Cover wlfh with transparent film upon which circuit has been drawn. Expose Double-sided 1 sq. ft. to lghl, light. (No need lo to use ultra-violet.) Spray with developer, rinse etch in n normal manner, manner. Cut n any multiple ol of 6' 6 Light N sensitive aerosol spray plus Developer Etchant 60p 50p postaae To a maximum size of 3' x 4' postage POSTAGE 25p NOTE: ALL GOODS PLUS 8% VAT (EXCEPT OVERSEAS) OVERBEAS) POSTAGE 2Sp 25p

47 * components list Resistors, R1 (R1a (Rla R1b) Rib) 20MO 20Mn i R2(R2a + R2b) 10MO lomfi (see text), ' R3 ' 47kO 47kA.., R4 (R4a + R4b) 20MO 20Mn R5 ' 1000 toon i C!,pacitors Capacitors C1 ' C2 O O^F 10V ceramic 0-47/rF 100 V 10V ceramic 100V Semiconductors. Tr1 -Trl, BC109, Tr2 2N5777 (General Electric) " 01 D1 10V 400mWZener W ' 02 D2 10V 400mW Zener SCR1 MCR120 or 2N5064(RCA) Miscellaneous Miscellaneous.,' Priiited Printed circuit board flbreglass fibreglass 2; 2} :X X Hn., Hin., 3mm,female connector, connecto'r, plastic box. ture after which it should be washed the resist removed with a solvent such as trichloroethylene or paint stripper. The holes are all drilled with a number 60 drill in a h brace or preferably in a pedestal drill. BOARD ASSEMBLY 20Mn resistors are specified for two of the resistors in this unit. XOMfi 10Mn is usually the highest value obtainable "over the counter" at a reasonable cost, so each 20MA 20Mn resistor is in practice two 10MA 10Mn in series, i.e. Rla^OMA Rla=OMn Rlb=OMn, = 10MA, therefore R1 R = 20Mn. The space shown for R2 allows for a single QMfl 10Mn resistor. However, a 'a particularly panticularly good BC109 BG09 will work with R2 as 20MA 20Mn which gives a higher overall gain to the unit. The position for the two resistors in this case is shown dotted in the diagram. The unit photographed has R2 as a single 20MX 20Mn resistor. C1 Cl C2 should be low leakage components. Generally, reputable film devices should prove satis- satis factory. Trl should be a device of a reputable manufacturer in order that the leakage currents be low, while Tr2 is specified as a 2N5777 2NS777 as this is the cheapest device of the 2N5777/79/78/80 2NS /80 range any range-any of which is suit- suit able for this application. The thyristor used in the prototype was a general purpose 300V device by R. However, the devices specified are the Motorola MCR120 or 2NS064 which have low gate currents. The screened cable by convention is positive on the inner conductor negative on the shield. TESTNG The PCS PCB when constructed can be easily tested by connecting to a flashgun fiashgun with a -3mni, 3mm socket trying it it by exposing Tr2 to the flash from another gnn. gun. Should any malfunction be apparent, voltage tests can only be carried out with a valve voltmeter or high impedance (10MA) (lomn) oscilloscope. Even then the readings may well be subject to considerable error. n the development of the original a SOMA 90Mn precision resistor was used in series with a lomfi 10Mn probe a DC coupled 'scope. FNAL ASSEMBLY The assembled PCB has to be placed in a small container for protection ease of use. The proto proto- type was fitted quite conveniently into an old "Cosmocord" Phono cartridge box. This box has a transparent plastic lid which is ideal as it allows Tr2 to be illuminated. The transparent lid can be painted from the inside except for a small aperture at one end for Tr2. The sensitive side of the device is the convex surface, which should therefore face outwards. The slave unit is best fitted with a 3mm socket, but these can be hard to obtain. As an alternative the female end of a flash extension cable can be used, as in the prototype. CONCLUSON The slave flash unit fires the second flash usually within SmS 5mS of the first flash. This means that with focal plane shutters on their fastest X sync speeds no difficulty should arise. With leaf shutters 1/125 of a second should be regarded as the maximum usuable speed. Although operating range depends on the power of the main flash gun, the slave unit will fire line- line of-sight to about 40 feet by reflected light from an average scene at 20 feet. These figures are based on the main flash being a guide number 32 gun (at 25 ASA) which is the least powerful available. lil'j Effi : YOU COULD MSS : YOUR SHARE OF : 500 WORTH OF : HEATHKT EQUPMENT : F YOU DON'T : MAKE A DATE WTH NEXT MONTH'S PW. P w AND ENTER OUR : FREE COMPETTON! : 913

48 TAKE2C1 2 DAVO DAVD ANDREWS No. 68 9V POWER SUPPLY A series of simple transistor projects, using not more than twenty components. WE cannot claim any form or originality for this month's project; however it is offered as a compensation for those who need a very straightforward power supply. There has been a large number of fairly sophisticated pieces of equip- equip ment published in these pages it is difficult to sort out the power supply stages in some of these projects. PTojects. "Pinching" the power stage circuitry from one project to fit another used to be quite, common- commonpaae but these days there is often as much com- corn place plexity in the supply stage as in the piece p-iece of equip- equip ment being supplied. One thing t is sure about our project this month- month complexity is out. There are certain limitations to it but at the same time there t are a,re many changes that can be rung with the circuit as it sts, to provide alternative voltages votages currents. As there are few difficulties in respect of the workings of the circuit we shall devote much of this part pari to explaining how one can make the necessary changes 10 to give- alter- alter native outputs. First of all we had better describe describt, the circuit as shown s'hown in Fig. 1.. Design Design n any power supply we have to use a transformer tmllsformel to provide isolation from the mains generate a lower level voltage, usually slightly higher than that which we ultimately want.. The output from the 10V lov secondary winding of the transformer, transfonner, Tl, is quoted in RMS terms (root mean square value); this means that the AC output voltage voltag.e will rise to peak values, a factor of root two (1-414) (1 414) times the quoted RMS value. The bridge rectifier comprising D1 Dl to D4 gives full wave rectification the capacitor C1 Cl charges up to the peak voltage, in this case approximately X x = break in conductor 51 Direction ot of conductors x io; rr' 51. 0' 01/04 'N400' BFYS' L~ f9 4V T1 01 Dl/W 1N4001 BFYS P D2 R, < THH o O l0v -T + 240V Cl Cl t 3000*;Fl 3000"F OS - * + OS 10V o ~------~~--~ o 0V FKoos! Fig. 1: Circuit Circuil of the he 9 volt vo/l stabilised slabilised power supply with wilh a maximum current currenl rating of 200mA.. 14V. f no current is drawn from the capacitor the voltage produced by the charge stored will be extremely stable free from AC ripple. t would be naive to expect a power supply to be entirely from ripple so it is worth spending a moment or two ex- ex plaining how the value of C1 Cl is selected. This is basically a "bucket" capacitor which charges up rapidly from the low impedance source soura' of the transformer diodes when the AC voltage rises in a positive -direction. When the input AC voltage fails falls the diodes become reverse biased the stored charge on the capadtor capacitor cannot leak away- back through the transformer. Assuming no current currenl is drawn from the capacitor capa.citor by load circuitry a few- cycles of the mains will "fill" the capacity of the -continued continued on page 928 Heatsink Healsink on TM rrl f if required r.d b e o Oc \ SrrcenV 1 ov t-- ~ ~F KOO Fig. 2: The unit can be assembled on plain reroboard with pins or on reroboard with copper rails as shown here- A heatslnk is advisable on the transistor. Fig. 2 : The unit can be assembled on plain veroboard wilh pins or on veroboard with copper rails as shown here. A healsink s advisable on he ransislor.

49 1J(E(]13 N NDMDNTH'S. Urn U(DJ~ pnequencu mocfliion 1.1. FA!QU!nC~~LLQC"Tlan.. };. 'A ".. ' : '.v,,:. j ~ 1lllllllllllllllld;iz J}!~tl:,!U MHz!fi 1 ~.... W~ At last) Now you can relate the dial on your receiver to the stations you want to hear, n At 'hlstnowyou C:lm relate the dial on your ' " terms of frequency or wavelenflth, long waves ' : '::;: ~Jr?l. ~~~::.!::.:';'~~';':~,:;~:,~,::,:~: to UHF. ~w 'ECls~build' ELECTACnlC aa;~n % VtJr? W This four-oc:tave tahh.tod 8ft 16ft pitc:h each with slid er A keyboard flexibility w variable it. t;.. ' MANY OTHER CONSTRUCTONAL ARTCLES, SPECAL FEATURES AND REGULAR COLUMNS. ON SALE N FEBRUARY ~w ltl:e~~. mm ccm~ettlcn S CC worth of HEATHKT equipment to bewon! 915

50 CASSETTE TTHOSE readers who have followed the series of articles on the car cassette player will probably have been interested in the possibility of con- con structing a domestic mains-powered mains cassette re- re corder/player. t was our intention from the outset to produce such a machine we first discuss the design philosophy involved. A cassette recorder is not a particularly easy piece of apparatus to design. A manufaclurer manufacturer can set up special machining facilities to enable production to be efficiently carried out, but the home constructor is faced with different problems. The projects he builds will in all probability be "one off" efforts; as a result he cannot reasonably be expected to provide facilities better than a well-equipped well equipped domestic work- work shop, at worst, may have only a work-table, work table, vice toolbox. t is totally unrealistic to attempt to construct the deck mechanics so we have a Goldring Lenco model CRV CRY mechanism with a DC motor elec- elec tronic speed control. The constructor has to build the casing chassis work, mount the deck build up the circuitry on Veroboard. Anyone experienced in the hling of commer- commer cial tape recorders will know that the multiple switching involved between the basic play re- re cord functions is usually both mechanically elec- elec trically complicated. This can pose many problems for the would-be would be constructor, to reduce the difficulties we have employed separate recording playback amplifiers. A degree of electronic switch- switch ing is used this simplifies the problem further. Some readers may feel that the use of separate amplifiers is somewhat extravagant. n fact this is not the case. The special switching mentioned before is avoided much expense saved in that direction. Also, trouble-shooting trouble shooting is eased by the use of sepa- sepa rate. less complicated amplifiers V AC SOU* FK007l Power supply ^jstabilisgr Motor control Circuit r Dick motor Eleclronk switching Head switching relay Bfcai?ra5«oscil ator R/P head K> Era&e head Another problem which can beset the constructor is the winding of coils. Tape machines usually em- em ploy timed tuned circuits as bias traps also in the oscillator circuit providing HF bias erase head drive when recording. Our machine has eliminated the use of such coils by a special approach to the recording amplifier design, by using the erase head itself as the inductive part of the oscillator circuit. t will be seen from the foregoing remarks that the entire project has been orientated for the home constructor, should therefore be con- con sidered in this light. The use of a DC motor for the tape deck makes the machine speed independent of mains frequency, by removing a potential source of fields in the form of an AC motor, the overall problem of hum pickup is eased. The supply voltage for the elec- elec tronics is obtained via a stabiliser unit which is complete in a T03 type transistor casing. The machine is therefore very tolerant of mains voltage frequency fluctuations. NOSE A considerable amount of thought has been directed towards reducing background noise. A tape cassette, when used for stereo recording, employs four tracks on a tape 'ain l8in wide, moving at only 178in V" per second. As a result, the output from the tape head is very low, usually between microvolts, considerable amplification of the weak signals is required. Low noise transistors are employed in the input stages of the amplifier, but the signal to noise ratio could still be improved. The use of Dolby-type systems was contemplated, but these are both complicated difficult for the contructor to set up. up, Also, tapes have to be re- re corded using the system. Recording amp'ifiep Replay mplifier Level indicator C OSrqnat in Relay contacts Noise reduction circuit a On/Off k-iosignal out Fig. 1: Black diagram of the deck. Fig. 1: Block diagram of the P.W. "Ascot" slereo stereo cassette decl<.. KE

51 s n Y- " wo «*VB_ H CUMMNS & TONY FRANCS * m CUMMNS & TONY FRANCS* t was finally decided to use a dynamic noise reduc- reduc tion system, wliich which reduces the response at the higher audio frequencies in the absence of sucli such signals on the tape. This reduces hiss considerably has the advantage that the system will operate on any tape; special spedal recording techniques not being required. As it is intended that the machine be used with an existing amplifier, outputs are provided at "LNE OUT" level only, for feeding the main ampli- ampli fier. No audio output stages 'are provided. nputs are provided for both line microphone. Bias is svvitchable switchable for the use of stard ferric oxide or the low noise chrome dioxide tape. The foregoing description has been basically a synopsis of the design approach. We shall now examine the circuits in detail. n order that the circuit may be easily identified, the reader is re- re ferred to Fig. 1, 1. Here the interconnections between the basic blocks are clearly illustrated. POWER SUPPLES The basic power supply for the amplifier erase oscilator is +12V, + which is switched to the amplifiers as required. Rather than have elaborate switching arrangements release mechanism linked to the stop facility on the machine, elec- elec tronic switching is employed. The circuit of the power supply switching is shown in Fig. 2. The AC mains supply is introduced via the on-off switch S 81 fuse F1 Fl to the rt:he mains transformer Tl, Tl. The transformer secondary supplies 15V AC to the indicator lights which are situated within the V.U. meters, also feeds D14, Dl-4, a bridge rectifier reertifier which converts the supply to DC. The DC supply is smoothed by the SOOO/'F 50001, F capacitor, Cl. The motor control circuit is fed directly from this source, whichals'o also connects to the regulator C1. C. The 11he + +12V stabilised supply is conveyed via fuse F3 to the final filter capacitor C2, from whence it feeds the elec- elec tronic switching amplifiers. 'Hamilton * Electronics Lid. Lld. ELECTRONC SWTCH The active elements of the electronic switch are the transistors Trl, Tr2 Tr3. The first two form a complementary bistable circuit, the base bias of one being derived from the collector of the other. When the machine is switched on both Trl Tr2 are cut off. t will be seen that the collector of Trl connects, via R4, to a supply supp)y rail marked C. Also connected to this rail is the diode D5, relay RLA the recording indicator lamp LP3. The reader will probably have deduced that rail C has to be switched to +12V + for the machine to record. By this means, the record/playback head re- re lay is energised, power -is fed to the th~ bias/erase,r~se oscillator connected to rail C. Also rail rajl B, which whch feeds the recording amplifier, is energised via D5 the record lamp is illuminated. When rail C is energised, the forward bias is removed remo,:ed from the base of Tr3 which cuts off, together with wth Trl7, Tr17, thus interrupting the power supply to rail A, which feeds the replay amplifier circuit. Trl7 Tr17 provides additional smoothing of rail A. The machine normally starts in the replay mode, which means that rail A is available, rails B & C,absent. The change-over is achieved by pressing S2, 82 which makes only for the duration of being pressed- pr~ssed. This short-circuits Tr2, in so doing connects conne,cts the base of Trl to earth via B3. R3. Since 8ince the emitter of this pnp transistor is at +12V + the device turns on, so applying power to rail C establishing conditions for recording as previously described. described, Also, as rail C is now at the +12V + level, this voltage is applied to the base of Tr2 via R5, so turning the device on. As a result, the conduc- conduc tion of Tr2 keeps Trl turned on even when S2 82 is released. The circuit is now said to be "latched-up". Switch 8witch S3 83 is mounted on the deck mechanism closes when a cassette is inserted. This open- open circuits the base feed to Tr2 when the cassette is 917

52 Fl 100mA Slow F2 SOOmASlow +20V R 100 l/2 W LPl(U LP1(R) Lamps situat~d in VU meters Q _ S On/Off PLA Mains input Brid9~ REC41A 'V R W L1 CRFC) Pow~r r 'w~--_...'\llj J" ;;..-~ to lcl MVR12 F3 250mA C2 100.uF, R3 2 2k R2 R7 330 k lrl AC12B R4 10 lr3 AC12B RB 4 7k +15-5V(Deck rynninq) 1S3b LP3 Cass~tl~ compartm«nt lamp 06 OA200 d~ck L3. R/P Head RLAl... Roe amp} Right -R»pl ampj R~pl amp Rl_A2 'r Rac amp 1 Cl SOOO.uF 2SV LP2 14V 40mA R~cord RSO Ri A RSl lbo C3 47.uF.::t, osc DC offset {o bias to VU m~t~rs fig. 2: Circuit diagram of die power connects the recordlplaybacf Fig. 2 : Circuit diagram of the power supply electronic switching. Relay RLA coljljects the record/playback head 10 the approprlale amplifier. ejected, so "unlatching" the record switching circuit ensuring that the machine has reverted to the play mode. t will be seen also that interruption of the supply mains will likewise result in the circuit unlatching.. Switch S4 is provided so that it is possible to monitor an incoming recording signal on the VU meters without having to have the machine actually switched fully to record. t connects the stabilised + 12V supply via D6 directly.to ;to rail B, which feeds the recording amplifier. Diode DS D5 is reverse-biased under these conditions so no power is fed to the erase oscillator, head switching relay, record lamp or latching circuit. When starting a new recording directly, the cassette is inserted while S2 52 is held down, down. C3 ' C4 are antiparasitic capacitors while R4 R9 are surge-limiting resistors. A lamp is provided in the cassette compartment, which enables tie the amount of tape ' used to be as- as sessed. t illuminates the cassette from above, so enabling the tape to be seen in the window. Because this lamp is situated near the record/playback head, it it is fed with smoothed DC to avoid any problem from hum pickup. For long life, a 24V bulb is used. BAS AND ERASE OSCLLATOR n Fig. 3 we show the circuit of the bias erase oscillator. The tuned circuit consists of L2, C6 C7. The junction of Cf> C6 7 C7 provides a capacitive tap across the circuit which is is used as a feedback point. The operation is is based on the use of complementary transistors Tr4 Tr5. Each transistor in effect represents a differential load, the emitters working into the feedback point at at the junction of C6 C7. Voltage magnification takes 918 place across the tuned circuit, this is coupled to the base network of the transistors by the capacitor CS. Resistors R12, R13, Rl4 R15 bias the transistors on sufficiently at the application of power to enable the circuit to commence oscillation. The use of this type of circuit, being symmetrical, reduces even harmonic distortion which can seriously impair the signal to noise ratio. Odd harmonics have far less effect. The bias signal is taken from the top end of the erase head. 'f,wo levels 'are provided, one for st ard RO 10 R 10 Switch~d 't2V lrs AC28 R2 47k R3 Sk R16 S'6k R14 1'8k SS STD Bias ratio adjustment L2 Eras«Head Fig. 3: The bias erase oscil/alor circuil uses he erase head as lis nductive element.

53 one for chromium dioxide tape. The higher leve! level for chrome tape is achieved by shorting out R1 VRl with S5. SS. Setting-up instructions are deait dealt with later. RECORDNG AMPLFER Now we come to the recording amplifier, shown in Fig. 4. This amplifier has to lift the incoming signal to a suitable level, feed it to the head in the recording mode. t is also necessary to pro- pro vide a meter for monitoring signal level. The first stage, Tr6, uses a low-noise BC109c BC09c to amplifiy the low-level microphone signals. The auxiliary input from the DN socket is attenuated down to microphone level, is connected when the microphone is removed from its jack. While it may be thought that the signal to noise ratio will suffer because of this, in fact the arrangement is completely satisfactory. The recording level is ad- ad justed by "VR6, which is placed immediately after the input stage. The more complicated part of the circuit involves Tr7. Tr7, Tr8 Tr9. This section is the recording amplifier proper, we must first consider its special requirements. To tu channel Mic SKB -.y 5-ploDN S-pin ClZcti ^FX RH C2 R23 R21 6Bk ~F;;t 270k Cl0 10 C11 VRSaJ 1*0 JiF VR5a look Rec level C9 47pF RB R20 R22 10k lk, 47k The head has an impedance of Skfl 18kn at SOkHz, 50kHz, requires a bias current of 500."A. SOO,uA. 9V rms of bias therefore have to be present across the recording head, this signal will obviously feed back into the recording amplifier via R30. t is common practice to insert a parallel tuned circuit, resonant at the bias frequency, in series with the audio feed feeu to the head- head. This "bias trap" pre- pre vents the bias entering the recording amplifier. The reader will realise, of course, that this involves coils, one in each channel of a stereo recorder. Our design has obviated the need for a.a bias trap coil, by rendering the effective output impedance of the recording amplifier extremely low at 50kHz. R30 the output impedance form a potential divider, which ensures that less than loomv of bias is found at the output of the recording amplifier. t may not be obvious why the bias should be kept at a low level within the amplifier; one reason is that an excessive level would limit the output swing available, so introducing premature overload- overload ing intermodulation. Another reason is that the bias is really an interference signal as far as the audio is concerned, spurious beat frequencies can occur resulting in "birdies" on the final record- record ing. T ro, BC22L R R26 R24 C14 10k 2'2k 100,llF tl2v@ From ~,07 bias OOpF VR3 'SOOpF osc 25k 2Sk S«t Set bias C«C16 l'opf :i~ ^ To head switching Less than l00mv siv relay of bias here hne i( in n 3'OV 3 0V pk-ek pk pk of audio +4^svl, "2li F blk RAU 47K (For DN) Less than 100 R24 C14 2-2k 100u F fac's T470pF ff VR2 To offset 200 'bias bias@ (5) Srl mt't~r»-+l2v Prom To offset Fig. 4: Circuit dlsgram of one channel of the recording amplifier. VR5 is a dual-ganged slider polen homeler with one track control ling the record level the other the playback volume. Fig. 4 : Circuit diagram of one channel Of/he recording amplifier. VR5 is a dual-ganged slider potentiometer with one track controlling the record level the other the playback volume. n order to record linearly, it is necessary to We shall now examine the output end of the ensure that the output impedance to tl:e the head is recording amplifier in detail. Three transistors are high. The effects of head inductance are thereby employed, the first two forming a complementary swamped the current through the head will be amplifier pair, with the last acting as an emitter emitter- proportional to the applied voltage. t follows there there- follower to provide a low output impedance. The fore that the magnetisation of the tape will be pro pro- DC working point of the circuit is stabilised, the portional to the input inpul voltage-the voltage the signal we wish components concerned are the input potential divider to record. The simplest means of achieving the re re- R21-R22 R21-'R22 which sets the base level of Tr7, R24, B24, R25 quired characteristic characleristic is to place a resistor in series R26. R2S R25 R26 form the upper leg of a divider with the head. Obviously this involves a loss of signal, completed by R24. but we should remember that the head only needs Substantial DC feedback is therefore applied 50/,A 50/iA of recording current into an impedance of around the complete loop. AcC AC feedback around this soon. path is prevented by decoupling R25 B25 R26 with The recording amplifier is designed to produce the capacitor C14. C4. R25 B25 therefore represents, in about 3V peak to peak signal, at low impedance, parallel with R24, an impedance across which AC which is then fed to the head via the 68kn resistor feedback may be introduced. The AC feedback net net- R30. t should also be remembered that we have to work consists of ClS C15 (DC blocking), R27, R28, Cl3 C13 introduce a bias signal into the head. This is ad ad- C19. Cl3 C13 has a low impedance at the bias fre fre- justed to the correct level by V-R3. VR3- Cl7 C17 represents quency allows heavy feedback to occur at 50kHz. a high impedance at audio frequencies while allow allow- This maintains the low output impedance at bias ing the bias signal to pass with little attenuation. frequency referred to earlier. 919

54 * components list <'': y? ~'\;<'" j.~ j,'r~~iti~ois Resistors ' i ;,'.',< ) 'Rl R1 > loofl 1'OO'fl "'R19 i 4-7kn 4'7k11, ' 'R37 ' aaokn 220k11 H.S. H.s., "R233OO. 330n " R20 "'1k11 kn" ', R38 47kn 41k11" :R3,' a-ana 2 '2k11 "~' R21 " 270kn 27()k11 ~' :R39 2-2kn 2' 2k11' 'R4 ' ion f011r22 ;' 47ka 47kO,",. R40 "R40 iokn 10k11 ' "';R5.'R5 'lokn 'f OkO '.",', R23" ' ': " R4t R41 " 330n ',,',:R6 Z-Zkd 2'2k11 R242'2k11'; 2-2kn ; 'R42, 22'2kO 2kn 470n R43 kn ~;~~!~~~ ':: ~~ ', '~~~ iokn ':"; R44 ~:! " 5-6kn ~~ko'".,, )~~, 1k(l..;,:.,; R21 4-7kn 4,7k.q,. R45, 27kn 27kO ' ';,:<~ RO 10 ion 1011 " R28 R~ ' 4-7kn 4'7k(l ~,': R46 ~ 33kQ 33kO, 'l:r11,r11 ion 100 " R29 ;: "".~," R47 R4f, 4-7kn 4'7!Ui, '.R1247kO :R12 47kn ; R30.~kOR48 68kn R48 :.15kn 15kO... ;~ R13.l-BkH 1'8kn, R31 R3t,470kfi 470kn U.S. H,S: R49 '.4'7k11 4-7kQ ',.R14.,:R14-1-8kn 1-8k11 R32",100kn,JookO,H,5. H-S. '' R50 RSO,; 120 l20. ' ^R15 47kn R kn R ::R16 S-6kn 5' 6kO -R34,,10k11 iokn ; R52. \ iaiOW t.rh R17. OSknH.S. 68kO H;S. R35,,10011 loon Ratt. 47kn 47k11 (DN),R18, 10ka 10kO, R362'2kO 2-2kn,.330kO(0-5v) 330itn(0-5v) "AlltW JW ± 5%except:R52" ",,.,R15, 47k11 ; R33,2' 2k11 ~ R51.' 180n - Variable resistors Variable resistors- ', '. ' ",VRl VR1 50kn :50k11 i VR2, '.,NR3 VR3 25ka 25k11,VR41OOkO lookq-, ' all allskeleton presets. 'VR5a/b ' looko + look11 dual slider, log. VR5a/b QOkO + tooko dual slider, log. Capacitors Capacitors -'Cl C 5000/iF SOOO",F25V 012 C12 220(iF 220",F 25V 25,,0,C2-100/iF 1oo",F 25V 013 C13 220pF (C) ' C3 47(i ~7p.F F 25V 014 C14 100(iF loo/f 10V :C /iF 100'F 25V C (iF O'22",F (P) ~ 05 C5 4700pF 47oopF'{P) (P) 016 C16 1((F p.f 25V (T) 'C6 08 O-O/iF O' Ol",F (P) 017 -CH loopf(m) or (S) (5) 'C7 07 O0' 1 047(iF 047",F (P) 018 C18 47(iF 47p.F 10V ' {.08 C8 10/iF 10p.F 10V 19V C pF (M) or (S) (5).",:~ YC (i 47",F3V F 3 V C20 10(iF 10)F 10V'(T) ; CO C10 D/iF 10",F 25V C2l C21 loopf loopf (S) (5) Oil Cll 1/iF l",f 25V 25Y C (iF 100JlF 10V C23 50(t 50,uF F 25V C24 10",F 10(iF 25V C25 loopf TOO/iF 10V C26 O' 0-1(iF l",f (C) -~'> C27 o 0 01/iF 01",F (C) " C28 O' 0- Ot(iF Ol/F (C) 'c' C29\,0, 022J1F (C) C30 COO " 10(iF 10JlF25V V ',,. C31 C3t" l/i lj1f25v F V,:. C32 ' 220/i 22Oj.tF F 25 25V V '. Key to tq';' capacitor types; types: '(C) Ceramic, ~ (M) Mica, ' '(P) Polyester, Polyeste'r; ' (S)" Polystyrene, Polystyrene; (T)" Tantaium. TantaUril. ', Remainder eiectr'olytlc. ",.," ;. Remainder electrolytic. ~,,".: ',_'e,.~. /:,.. Semiconductors ' C (iF{C), SePllco'nductors ', ',... '..,.', ",..,Tr4, Trll, TrH, AC127" AC127~.." Trl, Tr3, :rr3,tr,5 TrS AC128 :, Tr2 BC108..., Tr9, J9, Trt2; Tr12" Tr14-Trl6 Trl,4-Tr16. BC109 BC09 ;. Ti6, Tr6, Tr7, Tr7,Tr10 TrO BCKHc BC,l09c.,;,Tr8, Trll, 1:r11, Trt3 T(13. BC212L BC212l, D1-D V 2-2A 2'2A Bridge D5-D7 0~07 ; OA200 OA2oo. D8, 08, D9 Dj! OA Cl.12V.f2V Regulator in T03,. :. can(rs Components ComponeritsMV~12l MVR12) ",v Switches 51 Sl.. DPST OPST Min. toggle switch ' 52 SPST SP5T Sub-min mlcroswitch microswitch 53 Part of deck assembly 54 SPST 'Push switch, 550PST.Min. DPST toggle switch Miscellaneous. ", / Mlscellaneo.,.. '"''..'.', T1 15V1-8A l'8a secy.; secy.: RLA 4pco Min. Mi.n. Relay, 12V coll; coil:, M1 looiia,miniature 1oo"A.. Miniatureedgewise edgewise meter with 'ampholder:.',...'" lampholder; Li Ll 2A 9/iH 9",H Suppressor, choke: choke; L2 L.2 Erase head;,.. L3 Record/playback RecorQ/playback head; (L2, (L.2, L3 supplied with deck).-,.',- F1 100mA Delay fuse with holder; hqlder; F2500mA Delay fuse ' with holder; holder.;,lp1 6V LES LE5, Lamp; Lamp: LP2 14V 40mA,Red lamp; LP3 lp3 24V LES Lamp with holder; J1 3-5mm 3 5mm. switched Jack; jack; PLA Mains plug, 3-pin, with socket lead; lead: SKB 5-pin DN chassis socket (180'); (180 ); Cassette mechanism Gotdring-Lenco Goldring-Lenco CRV, CRY, stereo with DC motor. NOTE Two each of the following components are required for the two stereo channels: :- R17-R49, - R49, Ratt. Ratt, , C8 - C32, Tr6-Tr16, - Tr16, D7-D9, 07-09, Ml. M1, J1, Jl, VR2-VR5. VR5, LP1. The symmetrical network R27, C9 C19 R28 pro- pro duces negative feedback falling off at the higher audiq audio frequencies, this offsets head tape losses by providing a degree of emphasis at these frequencies. On replaying the tape, the levels are restored to normal, noise is reduced by the same process. The signal for recording appears at the emitter of Tr9 is applied to the recording ec::ording head via C6, C16, the DC blocking capacitor, R30, mentioned earlier. The emitter load is completed by R29 VR2. A proportion of the voltage developed across VR2 is applied to diode D7. This silicon diode needs approximately 600mV V applied in the forward direc direc- tion before it can conduct, the setting of VR2 enables the diode to be biased to a point just short of conduction. conduction- Audio modulation causes the voltage to increase on positive half cycles, so that current "spills over" through the diode into the capacitor G8. C18. The selected V.U. V.U, (Volume Unit) meter has an impedance which needs no further series resistance, the meter is connected directly to C8. C18. The time-constant of C8 C18 the V.U. meter impedance is chosen so that the circuit has a 920 sharper attack than decay time, enabling peak modulation to indicate reasonably quickly. Since the V.U. meter is effectively buffered by R29 from the emitter of Tr9, the non-linear characteristic of the diode meter circuit is prevented from having a distorting effect on the audio signal. A relay is used to connect the head to either the recording or the playback amplifier as required. The relay is RLA shown in Fig. 2. To offset the DC bias applied to the V.U. meter via ia D7, the earthy side of the meter is returned to RSO, R50, placed between the relay coil earth. :.:., ~.;.<_. ""~";':'",;,"<'',:'... < ~.~. :>~~, ;-~,..,.-'-," ","r.~, N~Xt Next month, h; n' in p~ Part t', ~, 2. w~< we d~.crib~the describe repf~y replay ampiifle; amplifier ~.Y"ami dynamic ~ ' noise reduction...:ci~~ circuitry ~ t..y. ^ J ' thelllotor motor,, ~~~tr~t control, 1?e~orep~sin~.:.~~t~ before passing on to the firs. first sta~eof stage construct construciion building iori'::':buildingthecabhiet. 'cabinet. ~;,,' "-..~..,;:::,..:",,.....,.. "',....:.' ~: '~..,.'

55 THE by Eric Dowdeswell G4AR CCOMMENT OMMBNT accompanying the many logs this month seems to favour a listeners competition of some kind. While am only too glad to organise one even arrange some small trophy there remains a basic problem. How does one submit confirmation of stations heard? t is bad enough getting QSL's know indeed quite costly these days but if the competition is to have any worth- worth while meaning then how are the claims of the lead- lead ing contenders to be verified? We all know it is too easy to sit down copy the calls of DX stations being worked by some high power G DX'er without being really sure that we have genuinely copied the call of the DX station ourselves! Transmitting amateurs can get QSL's or submit a statement that the QSL's have been seen by some responsible club official but what can the SWL do? Submit a tape recording? How about the first 'SWL ' to submit a card from an amateur station in each of the six continents after a certain deadline? Jot down your ideas with your next log. First newcomer this month is A. Doherty (Port- (Port rush, Co. Antrim) whose FR50B FRSOB brought in 'funnies' BY1MAO BYlMAO ZA1ZA ZAlZA among an otherwise excellent log for 80m BOrn SSB. 8SB. Also has a war surplus K119 R119 probably best employed as a paper weight! Sorry, forgot to say he is also BRS BRS3496B. Stephen Terry (Banbury, Oxon) has had his dormant interest in SWL'ng SWL'ing revived by a strong injection of FR50B FRS OB producing a good assortment on four bs. hope, Stephen, you will do the set justice by feeding it from a decent aerial in future. A first letter from Stephen Lawrence ABVO AB719 (Market Harboro) reports a string of JA allied prefixes on 15m Sm from his 9R59DS 9RS9DS multib dipole plus a 180ft wire. His sole goodie on 80m BOrn was VS6DO V86DO with infrequently heard KL7 7 on 20m. Next newcomer- newcomer is is Roger Trett (Norwich) who reports a 'new toy in in the shape of a Yaesu FR50B'. FRSOB'. He's concentrating on getting a 30ft tower up soon complete with 8 B element yagi for 2m plus a good long wire for the HF bs. Which will all come in in very useful after Roger has passed his RAB RAg which he he will have taken by the time this appears in in print, print. Back to to regular Tim Charles (Colchester) who sup- sup ports the idea of a b/countries sort of of table in in which he would be well away judging by his figures. which he would be well away judging by his figures. But he admits to just one country on l60m! 160m! Some Some- thing wrong somewhere OM... this past weekend worked 12 countries on CW including four W's in a few hours operating in the CQ WW contest. Make a point of listening in the CQ 160m CW contest ~ontest during the last weekeml weekend of January, when mtense intense activity can be assured. Tim seems to be convinced that Father Christmas will be wanting a large stock- stock ing in which to deposit a new receiver on the big day! Steve Blake (Aylesbury) has parted with his ex- ex WD gear in favour of a Codar CR70A CR7()A plus PR30 PR3Ci pre-selector homebrew ATU. Steve A8597 A~S97 is appalled, like many others, 'Others, at the behaviour behavour of?f certain people on 80m BOrn trusts that they Will will eventually grow up one day. Hear, hear! Steve's plans include a move to 2m with a converter ~nd cubical quad. Michael Green A8088 AB088 (Northwich, (Northwlch, Cheshire) Cheshir~) reports that ST2AY is old friend GW3UPK, heard on 80m BOrn ( sought by me on l60m!) 160m!) ~nd that JY9US is ex-wshlr ex-w3hlr c/o o US Embassy, Aman. Paul Barker (Sunderl) our SSTVexpert reports a fine catch in K0YKJ KOYKJ Boulder, Colorado on 21MH2 2lMHz.SSTV. SSTV, Contest prefixes noted were CV4 Uruguay CT7 CT Portugal. Max France (Warrington) has made a scoop with ZL4JF on Campbell sl on SOm BOrn SSB 88B which must be near the ultimate in DX from this part of the world, while still remaining earthbound! Max re- re ports 'a a move to the relative quiet of 160m l60m copying 15 S countries' on SSB 88B over the weekend. Tim Charles to note! Max is also an RAE-taker in the December exam we wish him luck. John Porter (Baslow, Derbys.) also noted strange prefixes such as CF Canada those mentioned above, plus 9H4 the pretty little isl of Gozo nestling alongside Malta. Eric Carlington (Lymington) stuck to 10m in.. contrast to most other reporters finding the b open from 0800 to 1630 with such juicy ones as WB2VUO/VQ9 on ' Chagos s. VQ9HCS VQ9HC8 on Astove s. Tim Charles, again, reporting on his go in the 40m SSB 8SB contest when he copies 277 stations 'without stopping up all night"! night'i His best, in my opinion, was KS6DW, a good one on any b. Back- to the first-loggers in the form of John Martin A8781 A878l (Kingsbridge, S. 8. Devon) who recently completed the building of his Heathkit SW717, 8W717, coupled to a tapped dipole. John, only 16, is studying for his RAE learning Morse put- put ting up some verticals putting an S-meter 8-meter in his set, where on earth does he get the time! Andrew Swiffin's first log to the column also concentrated on 10m. His PW Comprehensive Multib receiver is fed with a multib dipole mounted in the loft. X forgot to say that Andrew is A8603 lives in Cheadle, Cheshire. 921

56 Log extracts Tim Charles:-80m Charles: 80m PJ8KG ZL2GX ZL3ES ZL4AV 601A0 9M2AQ 40m FB8TD 0A4XX XT2MB YNOK ZL2VC 5T5TS 5V41W 5V4W 20m 20ra DJ6QT/CT3 FK8XA HL9KT KG6SX T9K ZLKE ZL1KE ZL3SW 5T5KFZ 9H4D. A. Doherty:-80m Doherty: 80m FL6CVC PJ2CW S21CW VP8NP VP8NF 4S7PB. Stephen Terry:-80m Terry: 80m FL8DJ OX3DL S21CW ZD7FT SOm 20m DU2VZ KX6BU ST2SA VR6TC ET2AP 8P6FU 15m A9XV ZD3G ZE6JL. Stephen Lawrence; 80m Lawrence:-80m VS6DO 15m,. JAOPFU JGOQZ JG10QZ JRMCK. JR1MCK. Roger Trett:-20m Trett: 20m P29FV ZF1XG 15m FY7AN H8MAG 10m CR6RJ 9G1AR. 9GAR. Steve Blake:-80m Blahe: 80m EP2LT T F,80M FL80M JY3ZH KS6DH VPFF VP1FF YK4TtJ YK4TU ZL3ACJ 2flm 20m 3D2AJ 3D2AN (Fiji).15m VP9HM YN9GL. Michael Green: 80m Green:-80m JY9GR ST2AY Y VP9AF 20m JY9US VS5MC ZD3M 15m 15ra HS4AFD. Paul Barker: 20m Barker:-20m CT7SH CX7B JY9US VP2MCU XU1DX XUlDX (Rhymer (Khymer Rep.) 7P8AQ 7X0WW 7XOWW 9L7JT 15m CV4C KOYKJ K0YKJ (SSTV) 10m A4XFE (Oman) HZKE 3B8CV. Max France: 60m France:-160m HBOLL OE3AML OH3MG PAOHP 4X4UR 4U1TU 4UlTU 9H1BX 9HlBX 80m CR7JO EP2TW FC6CXT EP8DH HZ1KE HZKE ST2AY Y TN8AD 5R8AC 7X4MH. 7X4MD. John Porter:~15m Porter:-15m KV4AD KZ5BC TU2EF 1112EF 20m DU1XKE DUXKE FP8DH HZ1TA HZTA MD MlD OY1A OYlA PZ9AA VP8NS. Eric Carting: 10m Carling:-l0m T3BVF PJ2RR HK4DF FL8HM FLBHM ZD8RD A6XT ZD3X XU1DX XUlDX 6W8FP 8RG. John Martin: Sm Martin:-15m EL2FP KG4NY VP2GTE VP2EY 80m ST2AY Y UA9GBO ZL4KF ZL4BX. Andrew Swiifin: 20m Swiffin:-20m KL7HRB ZLAJL 3D2AJ 4WGM 15m FY0BH FYOBH VP2GMB VP5WW ZB2GM lom 10m CE6EZ CX5CB CV4C. CW stations in bold, remainder SSB. 601AO 9M2AQ 40m FB8TD OA4XX XT2MB YNOK. CW stations in bold, remainder SSB. MEDUM WAVE BROADCASTS by Charles Molloy A RTHUR TAT (Berwick, (Lerwick, Shetl) asks 'Am p: \ the only UK listener to dearly clearly pick-up Faroes -X- Radio from Torshavn on 584kHz (513)?' Using an Armstrong 626 tuner-amp a 25ft loft aerial, Arthur enjoys enjgys regular reception of Torshavn TGrshavn in the Faroe sls mentions that this station has a request programme on Sunday afternoons afterngons at 1400hr. This 5kW broadcaster bmadcaster is sometimes heard hea rd in southern UK in spite of interference from Vienna, Paris Madrid, all on the same channel. t 1t has been logged occasionally by the writer at the 0715hr sign-on, using a communications receiver (Marconi Mercury) ' a medium wave loop antenna, antenna. Torshavn will verify a correct reception report with a 'a picturesque QSL card which makes the effort involved in logging this elusive station well worth while. Brendon McNamee has moved from Portrush to Loughborough. He has been using an outdoor UHF TV aerial connected to his Sharp BZ-23 portable TV aerial connected tg his Sharp BZ-23 portable 922 receiver from medium wave reception at his new QTH. His log includes BBC local radio' radio outlets at Derby on 115kHz (271m), Humberside on 1~84kHz 1484kHz (202m), N{)ttingham Nottingham on 1520kHz 1520kH2 (197m), {197m), Lecester Leicester on 1594kHz (l88m). (188m). R. Dixon who lives in Grimsby has only a lim;ited limited' space available he wonders what type of aerial would be suitable to hear as many as possible of the BBC commercial radio stations which have opened up over the British sles. An outdoor TV aerial (as used by Brendon McNamee) makes a good aerial for use on the med,ium medium waves. Corurect Connect the outer (screen) of the co-ax TV downlead to the aerial terminal on the receiver,. if possible, connect the receiver earth terminal to a good earth connection. Results will much depend upon the. length of the downlead. Brian Murray, our regular reporter from Edin Edin- burgh is stili still active on the medium wave with his GEC BC3248 receiver end-fed 25ft outdoor aerial. Brian reports hearing Murcia in Spain Sp'ain on 854kHz at 0023hr, 0Q23hr, CSB2 in Lisbon, Portugal on 1034kHz at 0030hr; Radio Centro in Madrid on 1385kHz at 0038hr Radio Swansea was heard testing on 1169kHz. J. Livsey (Rochdale) has been having trouble with his TT/KB lt Tiny 3 receiver. receiver_ When tuned to the medium waves, reception recepti-on is marred by 'a con conglomeration of CW, RTTY RTY a very active amateur b'. The trouble of course lies in' the aerial tuned circuit which probably is not working or mis-tuned mis-t~ned image frequencies, 1550 to 2500kHz, are being received at the same time as the medium wave b. Receiver mis-aiignmenc mis-alignment can give similar troubles whenever weak CW signals are heard at the high frequency end of the MW b, this should be suspected. Asiatic stations are often heard on the medium waves during the winter months. Listen during the late evening for Kuwait on 539kHz; Riyadh in Saudi Arabia on 587kHz: 587kHz; Kermanshah,' ran on 985kHz; Bagdad on 760kHz; Kabul, Afghanistan on 1280kHz: 1280kHz; Kuwait on 1345kHz: 1345kHz; Bagdad on 1360kHz; Ahwaz. Ahwaz, ran on 1390kHz Dubai, United Arab Emirates on 1480kHz. The loookw 1000kW Voice of Free Asia in Thail transmits transtnits on 1580kHz (between W. Ger- Ger many on 1586kHz taly/norway on 1578kHz). This station stati<>n comes on the air for half an hour nightly 'at 2200hr with w1th news in Cambodian it is often heard here in the UK. SHORT WAVE BROADCASTS by Derek Bell N NOW ow that the Far Eastern DX season is with us, by coincidence comes a letter from Leonard Adlard of Leigh-on-Sea, who has a problem. His daughter lives in Bangkok, Thail he wishes to hear the same radio programmes that she does in order to establish some sort of link with her. A pity, Mr, Mr. Adlard, but the only thing you will hear is the overseas service of Radio Thail. This is on aimed at North America, it has news in English but this is at 0045, person- person ally have not heard them for many a long day but if you care to. to, contact the Public Relations Dept. Bangkok, Bangk<>k, Thonburi Metropolis 2, 2. Thail. How- How ever, some of our readers may he be able to help so drop me a line folks if you can assist. Our old friend Albert Ord has moved house, now being safely esconced at Bolden Colliery, Tyne Wear, he writes that he can pull in the following:

57 ON THE 7 AR / 5805 R. Sanaa, Yemen in Arabic at Voice of Nigeria in English at R. Bangladesh in English at on his Trio 9R5 9DS plus Hamgear Preselector Preseledor Joystick. He also heard R.S.A. in Chichiwa on Jil970.1i1970 at,1700, this in itself is not a difficult station to hear, but this part of R.S.A.'s service is not intended for the UK the aerials would be on a beam for Rhodesia, Zambia Malawi area. am sorry Albert, Abert, bufyour but question about artificial earth equipment is sur- sur rounded by patents all sorts of legal tie-ups. November the first, as you perhaps know," know; heralded the change to winter schedules for many of the short wave stations. K. W. Snipe {sorry (sorry no Christian christian name), whose QTH is on the sle of Wight, notices that the strength of certain stations is dropping that he has to use aerials of progressively greater length. He also writes to say that Radio Pekin has changed to 7590, 6860, 6270 for their English transmissions- transmissions. Robert Hill of Hough, near Crewe, sends us more information on changed transmission times. He writes to let us know that R. Nacional de Brazil now transmits in German Portuguese on with a sign-off at The English service now moves to Robert, it seems, has a slight problem. Not content with DXing with his Pye nvicta 8027, his GEC GEG UHF TV set has got into the act he reports that it has been "putting out" the Deutsche Welle signature tune"! Robert then goes on to ask if this is a stray signal. Well, my own TV has given me the Radio Tirana sign-on tune, lying behind a satellite transmission from the US. would say it is cross- cross modulation but that blanket covers a lot of freak happenings, happenings. Perhaps someone, with more knowledge of TV than, can provide the answer. The item on QSL timing in a previous Short Wave News has sparked off some interest, in the form of a letter from a DXer from "way hack", back", namely Lex Arnold. He writes from Hemel Hempstead to send a list of QSL's that have reached him along with the time taken; taken: Helsinki 1 week RSA 3,weeks Pekin 3 weeks but the top is R. Nacional de Brazil at a staggering five,. weeks. Lex then goes on to point out that he has heard Polish Pathfinders on 6830 at 1530 with folk pop music. So come on you music buffs, this is a station that is very rarely reported, have a listen let us all know what it sounds like. Two sheets of eye-catching orange note paper herald some very valuable info from Malcolm Collins of Middiebrough. Middebrough. Driving a Prinzsound R888 hooked hooke'cl on to 45ft of wire, this correspondent, in his first try at reporting to SWN, tells us that he has latched on to the Deutche Welle relay tests from Malta on 9610 at Malcolm also reports Radio- Radio diffusion Television vorienne on at 2208 in French. This imposing title covers a 100 waiter watter at Abidjan that puts out French local vernacular programmes for the vory Coast. Radio Norway in English on 6185 at 1200 is the "cream of the crop" from David Brooks of Melton Mowbray, who has a Grundig "Yacht Boy". t seems that David has the unenviable record of having been waiting 190 days for a QSL from Belgrade. Paul Broadhurst of Tickenham down in the Zider ls of Somerset is a QSL fan sent me the contrast of Bulgaria taking 270 days R. Finl taking nine. Finally on QSL's for this month Trevor Bl of Lea, Lincolnshire, writes to ask how long he would have to wait for a QSL from All-ndia Radio. Sad news Trevor, because back in October they were reported taking 128 days sending by seamail. Return airmail postage would help! Northwards to Scotl goes your intrepid reporter now, first to answer Brian Murray of Edinburgh, who while listening to his GEC BC3248 which hangs on the end of a 25ft end fed aerial, came up with Radio Norway on 6185 at 1220 in English, the same service as reported by our earlier contributor. Well gents, a little bird tells me that this new frequency was chosen by R, R. Norway because they found that they were being interfered with by the BBC to avoid fuss, they moved! A scion of the clan, Douglas Mackenzie of Crieff is our second Scot he would like to know some- some thing about public service stations, if any DX club has been formed for them. The short answer Douglas is, NO. Under British law it is illegal to report or to listen to such stations, therefore no club can be formed in Britain for them. Three letters now all asking the same thing, D. Vranch of Annesley, Notts, A. E. M. McCarthy of Southampton, the gentlemen of High School of Stirling Radio Club. These folk are all newcomers to the short wave scene, all would like informa- informa tion. To them can only_ say that to fulfil these requests would take the whole of this magazine, resulting in the Editor sting me against a wall shooting me! What can tell you though is that Radio Neder- Neder l, P.O. Box 222, Hilversum, Holl, publish some superb free leaflets covering most aspects of the hobby they are well worth getting in touch with. The time has come for me to close this month's column. To my surprise the mail was 300%. up on my first effort, to all whose worthy efforts have not been included my apologies keep trying. rtrying_ Two small sm.all items to wind up, Reg Kennedy of World Radio Club writes that his times of transmission have changed from January 4th: 1330 to to to to 0830 While for philatelists, Andrew Knock of Witham, Essex, reports that Sri Lanka on at 1545 on Sundays is now putting out a stamp programme followed by BBC World Service news. BROADCAST BANDS BROADCAST BANDS Short Wave reports by the 15th oi of the month mo.nth to Derek Bell c/o. Practical Wireless, Fleetway' House, Farrlngdon Farringdon Street, London, EC4A4AD. 4AD. Medium Wave ""live Logs to Charles Molloy. Molloy, 132 Segars Lane. Lan.e;. Southport, Soutl")port, ' PR8 3JG. 3JG: AMATEUR BANDS Logs covering.anyamateur blind/s in, bl alphabetical alphabeticlllorderby. by the,middle of the month to Eric Dowdeswel! DowdeswellG4AR,SilverFirs, Leafher- i.;eather head Road,.Ashtead, Surrey, KT21 2TW. '. Logs covering any amateur b/s n b/,, 923

58 Usm cassette -1 \ ftrwl PART THREE s^s«isps KETH CUMMNS &. TONY FRANCS* METALWORK The raechanisra mechanism,.amplifier panel are arranged side by side in a metal case, whose overall dimensions fit a stard s,tard car radio slot. The case is built from four pieces of 16 or 18 s.w.g. aluminium. These arc are a bottom section with sides formed by bending upwards, a front panel, a rear panel a lid. The rear panel, besides providing access for foj" external connections, acts as a heat sink for the four output transistors. The front panel carries the volume, tone balance controls a pilot lamp, is slotted for the insertion of the cassette. The deck mechanism control lever is brought out through a smaller slot. "No 'No on-off switch is provided; insertion of the cassette switches the machine on. Automatic ejection occurs at the end of the cassette, while fast wind manual eject are selected by the control lever. lever- Measurements for,the metalwork are shown in Figs To avoid trouble later on, the various parts should be offered up to their appropriate fitting points to ensure that the drilling has been accurately carried out. Burrs should be removed carefully. Failure to pay attention to this point could result in disastrous short-circuits occurring, par- par ticularly through the mica insulators on the output transistors. Great care should be taken with the marking drilling. Remember that it is best to measure twice cut or drill once, rather than have to start again. The diagrams should be studied carefully before commencing anything. The most difficult parts of making the case are the bending, which must of course be accurate, the cutting of the slots in the face-plate. fa a bending machine is available the job is easy, so it is worth trying to gain access to one. Failing this, a vice wooden blacks blocks will have to suffice, though it is best to use 18 s.w.g. aluminium in this case. The cutting of slots requires some very careful filing if the job is to look professional, even more important, if the cassette mechanism is to operate easily. ASSEMBLY When the case ease has been built, the deck mechanism can be assembled into it using the small bracket shown in Fig. 5 to support the right rear corner- corner. Then the output transistors other components attached to the case rear panel can be bolted on before it is fitted to the main casing. 924 Mount the completed amplifier board in the case, case. connect it to the remainder of the equipment as shown in Fig, Fig. 7. The output transistors are wired to the amplifier board by suitably neat loomed cable connections the power input speaker output leads taken through the grommet positions in the back panel. The connection between the tape head -, the amplifier board has to be made, the controls wired acco,rding according to the diagrams. Once the controls panel light have been attached to the front panel (the balance control used in the prototypes was fixed with Araldite), the panel can be finally positioned secured to the front of the machine. A 3A fuse should be fitted in the power input line to the machine. The speaker leads can be taken either to separate sep,arate speaker DN cable-mounting sockets, or to one 3 pin DN socket, using pin 2 as a common return. A check with a multimeter meter should next be made, using the lowest resistance range, to ensure that no short-drcuits short-circuits are present either in the wiring, across the power input, or from the output transistor collcctors collectors to the case. The resistance resis,tance reading between the "bases of each pair of output transistors should be set to zero by adjustment of 'the quiescent curreni current potentiometers, VR4. Note that the zero position is at opposite ends of the track for the right left h channel pots. TESTNG The fuses should be left out of the output stages at this point the machine powered up from a tapping on a car battery, say 8 volts, to see whether the mechanism runs. A cassette should be inserted, inserted. if it appears that the mechanism shows signs of running correctly, the voltage may be increased to 12. Keeping the volume down, the current across each vacant fuse position, p,osition should be metered adjusted to 10 ma, using the potentiometers VR4- VR4. After setting up this quiescent quiescel1i1: current, the fuses may be fitted the speakers connected for a test of all functions controls. The alignment of the tape head should be checked when playing a cassette. The head is secured by two screws: the one with spring under it (on the right when viewed from the front) is adjusted for maxi- maxi mum treble response. The other screw sets the head height should not be touched. Hamfltcm Hamilton Efcclronfcs Electronics Ltd, Ltd.

59 Mark llxlng fixing holes n in (d lid rear plate using lower case section as s a template _; / ^Berd up to (orm Bend up to form bracket supporting rear corner of cassette mechanism cassette mechanism 3^ 8 Mark out each tr3nslstor\_s-a" J c 2^ position using mounting washer as template, - 4^' -^3^ h % ^ Brackets for under-dashboard mounting if required, required. (fit to case before mounting cassette mechanism) Drilling key: : a... 1 \ 4 dia., b... 2BA ciear. clea~, c. c...-^ba ABA clear, clea~, d._..6ba d... clean, clea~, e....,6ba tapped, tu-o '" * are drilled 4BA.while 4BA, accepting SSA 6BA bolt for deck securing.to securing, allow tor for tolerances. 3" " '~"--,,,-- 41~~ ---, -'-t..j 4BA^- Cut-out for cassette loading r^ei 7Jtl~". 15'" - "'32 -"1-_-+_ "Z' -115; ^2 % Operating lever slot.- 1 v8 1 "i6'--+-<'; L ~~~- See Fig.6 for full details of front panel drilling.. tc Fig. 5: Dimensions assembly of the metalwork forming the case.!:i<" s 5 -; 8 J2 ~i' ~.i ~.4BA 'X' 8 dia. - 1 Vb -See Fig. 6 for full panel drilling etc Fig. 6: Drilling culling details... Fig. 6: DriJling cutting details... ' for the front panel. The slots for (or the casseffe cassette mechanism must be accurately cut for smooth operation. UVufisl accurately cut for smooth operation. Finally, it will be necessary to adjust the motor speed so that the resultant resu11:.ant tape speed is correct. VR51 on the motor mortor control panel sets this. A simple way is to tl() use a previously recorded cassette, time the period a given item runs on another rnachine. machine. The potentiometer may then be adjusted so that the time taken is the same on the car player. Now, some remarks on using a positive-earthed pooitive-earthed system. You will have noticed that the amplifier board earthing occurs via the output transistors ends up at the deck mechanism. Also, all the output transisoo'sare transistors are fitted with insulating insulating washers. There- Therefo're it is relatively simple to reverse polarity pola,rity on the amplifier section, though the change-over for the deck mechanism needs more care. The alternative arrangements are illustrated in Fig. 7. A disadvantage of using a positive-earthed system is the fact that the "earth" of the head windings is fore then at - 12V with respect to the chassis. chassils. Care should be taken to ensure that a short circuit between the cable screen chassis cannot oannot occur at the head. FAULTFNDNG f all is well with your tests, the machine should now n'ow be running normally, the effect of 'Of all the controls may be finally checked before fitting the top G'Over cover to the machine mounting m'ounting it in the car. n the event of a fault being evident,,the following checks will help, to reveal the cause: oause: 1.The emitter voltages of the output transistors should be approximately half the battery voltage. 2. Likewise, a reading of about half the positive rail voltage should be obtained at the emitter emi,ttet' of Tr5 TrS the collector of Tr2 if these stages are operat- operat ing normally. 925

60 Earthing/securing bolt This tag connected to Tr9fL) collector (NOT chassis) (NOT chassis) ill ndicator lamp (LP1) Motop Mntrol hoard Chassis connection 1 (NOT Tr52 collector)) Solenoid Earth tag To DN sockets via lower grommet in back of case. Replay head Cassette mechanism r ed screen blue blue recl \ Tinplate screen r ~ Alternative wiring for DOLibve <+) earth systems '! o. o -12V Alternative wring f~j:os ltlve (+) earth systems Main amplifier panel va F2 o R14(R) -Rear view of balance pol. Rear view of balance pot. Solenoid VR3(UL, VR3(L) blue L_.._.._..._.._._J ndicator VR3(RJ red-fscrcen To tagstrip mounted on Tr9(L) - ^3 i - p, 1 f&s! ndicator (amp lamp fig. Fig. 7: 7.. Wiring diagram, including derails tails ol of changes reguired required lor for positive posilive earth earlh working. wor~ing. Connections beiween belween (be he Motor Molor Control Conlrol board the he motor, molor, the he commulaling commutating switch Tr 52 base emitter emitler are not shown. 3. f one channel operates while the other docs does not, amplifier. transposing the leads from the volume control t would seem opportune at this point to re-stress slider between channels will show whether the the need for constructional accuracy in making up pre-amp or the main amplifier is at fault. f the the unit. We arc are all inclined to think that the other output changes channel, the pre-amplifier is defec- defec fellows are the only ones to make a mistake, while whill:' tive, while if it does not, the fault lies in the main really we are as fallible as the rest. So be careful, 926 continued on page 945.

61 80118 BC.. 30 * 50 OOUR friends at the BBC have issued a record entitled "Fifty Years of Royal Roy'al Broadcasts 1924 Broadcasts-1924 to 1974". This magnificent collector's piece is a natural successor to the very popular record which reviewed some time ago called "BBC , 50 Years of Broadcasting." This new record is a douhle- doublealbum which recalls some of the most famous memorable Royal National N,ational events which have taken place over the past 50 years. Narration is by Robert Hudson from a script by John Laird..t,t albura has been compiled from record- record ings from the BBC Archives The record sleere which shows a full-colour picture of the Crown. The record sleeve which shows a full-colour picture of/he Crown. covers recordings from fmm the very first Royal broadcast in 1924 by H.M. King George V to the wed- wed ding of H.R.H. Princess Anne Mark Phillips. Other recordings include the September 1936 march of miners through London singing "Ebe- "Ebe nezer"; H.R.H. Prince Edward (1936) making his speech of abdi- abdi cation to the Nation; the' two princesses broadcasting to the children of the nation on 13 Octo- Goto ber, 1940; the Christmas 1944 broadcast by George V the V-the last Christmas message of the war war many others. COLlN COLN RCHES tl 23rd April H.M. Kins George V opens very first broadcast by a British Monarch t is interesting to compare King George V's formality sense of wonderment at the miracle of radio in his speech at a't the opening of the 1924 British Empire Exhibition, with the Queen's wonderful informality when she remarks "My husb we, -we, by that mean both of us..." " in a speech at a luncheon to celebrate their 25th wedding anniversary. H.R.H. the Duke of Edinburgh also demon- demon strates his informal approach to broadcasting when he recites a limerick about the "young man from Khartoum." 23rd April H.M. King George V opens the British Empire Enhlbllion. Exhibition. This was the very {irst broadcast by a British Monarch Vf Mk.v:-. llh December 1936, H.R.H. The Prince 11th December 1936, H.R.H. The Prince Edward speaks to the nation from Windsor Castle, following his abdication so that he could marry the woman he loved so dearly. could marry the woman he loved so dearly. iaill! 2Sth December 1344, H.M. King George V/ the war. 25th December 1944, H.M. King George V broadcasts on the last Christmas Day of the war. This Tliis double album also con- con tains reminders of events situations of national importance like the Rt. Hon. Neville Nevile Cham- Cham berlain's "peace in our time" speech. The grave voice of Lionel Marson announces the Nazi take- take over of Pol in the Second World War. The sounds of war are ere recorded on 23rd Septem- Septem ber, 1940, H.M. King George V announces the creation of the George, Cross for civilian acts of valour. On Gn side 2 of the album the King speaks to the Empire on the last Christmas day of the war. On Gn May 8th, 1945, an ex- ex cited Stuart Hibberd informs the nation that peace has been de- de clared. Princess Elizabeth her little sister Margaret broadcast broadoast to the children chhdren of the world. They say, "My sister s by my side we are both "My sister is by my side we are both going to say 'goodnight' to you. Come on Margaret! Goodnight children, Goodnight Goodnlght good luck to you all". good luck to you all". "When peace comes, it will be for us, the children of today, to make the world of tomorrow a better happier place." 'Dhe,re There is also a very emotional track of the V.E. Day crowds in Whitehall singing "God Save the King." Side 3 starts with H.M. The King speaking on (in the first Christ- Christ mas Day of peace. The 26th April, 927

62 S 21st April H.R.H. The Princess Elizabeth n in Cape Town broadcasts her Speech of Dedication on her 21st Birthday. 1948, Silver Jubilee Celebrations Ceiebrations of Their Majesties King George V Queen Elizabeth, who speak to the peoples of the Com- Com monwealth is a 'a very interesting track. We 'also hear a magnifi- magnifi cent recording of the wedding of H.R.H. Princess Elizabeth to the Duke of Edinburgh. John Snagge, on 6th February, 1952,announces the sudden death of H.M, H.M. King KJing George Geor,ge V there is a beautiful recording of Queen Elizabeth's Elizaheth's Coronation in Westminster Abbey. Side 3 ends with Her Majesty broadcasting to her people on the Coronation iday. Side 4 starts with the 1953 "Ceremony of the Keys" at Edin- Edin burgh Castle, ' the Bt. Rt. Hon. Winston Churchill Churchin speaking lin the tke Guildhall,at the luncheon given by the tp.e Corporation Corpol'ation of Lon- Lon don to welcome back The Queen The Duke 'after their thei,r Cana- Cana dian tour. The July 1st, 1969, nvestiture nvestituire of The Prince of Wales is re- re corded with the Prince proving that he can actually speak Welsh by saying, "Rydych chi'n canu yn iawn. Diolch yn fawr" (Your Rydych chi'n canu yn lawn. Diolch yn fawr. of Wales. Rydych chi'n canu yn iawn. Diolch yn rawr. July 1st 1969 the 1969-the mestllure nvestiture of the Prince of Wales. singing is is fine. Thank you very much). The collection of of recordings finishes with the wedding of Prin- Prin cess!anne to to Captain Gaptalin Mark Phil- 1- lips. These two records, which come in in a very attractive presentation folder come complete with a 12- page booklet of of photographs excerpts from the speeches. The BBC number is REJ 187 the price is would say to you collectors of vintage equipment recordings to those of you who just love to bathe in the nostalgia of the "gold old days" that this double album is well worth every penny of the f you want to buy a copy, you can go to almost every record shop in the country. Please don't go to the BBC, however, because they 'are unable to supply their records tapes direct. nci- nci dentally, the BBC tell me they the,y hope to issue their records on cassette cartridge also. We wish to thank the BBC for allowing We wish to thank the BBC for a/owing us to use photographs contained n in the 12-page booklet which accompanies this album. TAKE 20 continued from page 914 TAKE 2O-continued from page 914 capacitor cap'acitor from that moment on there will be no change in voltage across aoross it (this, of course, assumes as'sumes that you do not have a leaky capacitor!). cap'acitor!). f, however, one is dl'aw!ing drawing current from the capacitor with a load the charge cha'rge stored will reduce during the period when the AC input voltage falls away from peak; this causes a slight fall in voltage but is rapidly corrected correc!ed when the AC rises to its next peak positive value. The more current one draws from the capacitor the greater will be the momentary fall in voltage. We end up with h a 100Hz ripple on the DC voltage across the capacitor. ts frequency is 10QHz 100Hz because of the full wave reatjification reotafication aaction otion of the diode bridge. The greater the load current the greater win will he be the ripple. To avoid extreme values of ripple one should,aim to have a large value of capacitance which is charged up from as low an impedance source as possible try to avoid drawing too much load drawcurrent. ing too much load current. Stabilisation The foregoing assumes we have no srtjabiusation stabilisation but in this case we have included a first order degree of stabilisation which help's helps reduce the ripple content of the output voltage also ensures that the output is fali.rly fairly constant under a wide range of loads mains voltages. We have adopted the straightforward series stabiliser circuit which is simply an emitter follower (Trl). The voltage at the emitter of Trl will be set by any voltage we apply to its base. n actual fact the voltage we obtain at the 928 output will be approximately 600mV less than the base voltage because of the forward fo'rward voltage drop across the base/emitter base/ernijtter junction. The base voltage (or reference voltage) must come from a source that is capable of supplying enough current to ro satisfy the input requirements of an emitter follower. That is to say, we must be capable of passing pass!ing base current equal to the load current divided by bp hfe E for the tr:ansi:srtor transistor in question. * components list T1, transformer, Mains/tOV 250mA T1, transformer, Mains/10V 250mA 01/4, 01/4. 1N , D5, 10V 400mW zener diode. diode, R1, 4700 two 4W. C1, Cl, 3000,uF 3000pF 20V. Tr1, Trl, BFY51. BFYS. 51, OPST toggle 250V. Heatsink for Tr1, T05 style. S1, DPST toggle 250V, Heatsink for Trl, TOS style. We are arc using a 400mV loomv OV 10V zener r diode DS D5 fed fee! through a low value resistor R R1 to p rovide provide this current. rrespective of the voltage at the top end of R R1 the volljage voltage across the zener will be lov 10V so obviously the supply voltage must be greater er than 10V for this to be po,ssible. possible. Consequently any varia varia- tions in the supply voltage wjjj will not change the voltage across the zener. This statement is only true to the first order of approximation because the voltage of a zener is only constant when the current flowing through it is constant.. Nevertheless varia varia- tions in supply voltage produce only 'Small small voltage variations across the zener. Having said that the output voltage will equal the base voltage you should now see how we get a reasonably good degree of voltage Sltabilisation. stabilisation. ~ EH

63 OTLNE ON ON RECENT DEVELOPMENTS THE SZE OF THNGS Two items of news have reached me from the US which might be of interest to readers. The first concerns the size of things. Apparentfy Apparently the funds foods available ava~lable for "advanced tech- tech nology research" for 1975 are a staggering $90 million. This is money made available to the US Army's Ballistic Missile Defense System Comm- Comm. One of the things that some of this money is to be spent on is miniaturisation miniaturisation- do mean miniaturisation, miniaturisation. A spokesman is quoted as saying that the size of radar units could be eventually reduced by up to 90%. Since the commercial industrial worlds of electronics nearly always benefit from the spin-off which comes from the military, readers can appreciate the implications. Perhaps that wristwatch television is just around the corner. A WATCH ON TME! A friendly industrial spy, just back from the US informs that the digital watch scene will almost certainly hot up next year. He visited something like 24 different manufacturers in the States everyone appears to be manufacturing million's millions, of circuits for digital watches. With j a hard time coming for the industry, these manufacturers having all : these circuits to unload, believe that the digital watch with its current i price tag in the UK ot of 200 or so wil! will come spiralling down very fast indeed. So, if you're going to buy a digital watch watch watch-watch it, the market mean, perhaps wart wait a little while save yourself some hard cash.. DGTAL MULTMETERS METERS Digital multimeters are in the news again but the cheapest have found round is the SA DMM3, DMM3. t costs 40 covers the usual current, voltage resistance. resistance- t does incorporate one clever idea. On the face of it, the voltage range covers up to kv. 1kV. Once the input gets over this the instrument goes into "over-range". This effectively protects it from blowing up. nteresting thing is that the over-range permits double the rating to be used- used the digital readout will display Just just what this reading is. So, if you were on the reading is. So, if you were on the 0-1A A current range (for example) you put through it, the readout would read 1-890A, 1 890A. The dodge is that you effectively get twice the range. Thus the 0-1 kv range wil! will read, in fact, 0-2kV automatically the 0-1A A current range reads 0-2A automatically so on. automatically so on. VDEO SYNTHESSER With accent these days on tele- tele vision "games" such as Tele-Tennis the like, a topical product is the colour-video synthesizer. What does it do? Well, if you think of sound synthesizers where all sorts of funny little squeaks (some musical others mystical) can be played, then just translate this idea into colour video where all sorts of coloured shapes patterns (static or moving) can be displayed on a television screen. The digitally-based system is called Spectre ( might have expected that) it can display its self-generated images in up to 64 different colours. t also boasts the capability of 16 levels of luminescence can input also from TV cameras (including monochrome) ordinary film still life photographs pictures. Spectre controls colour brightness by using digital signals on an X-Y X-V axis technique. The user has a matrix of sockets which can be "programmed" by plugging in diodes to form the shapes, etc. n the pipe- pipe line (so 'm unofficially told) is a keyboard which gives the user a chance to "play" preset chords of colour shapes. wonder whether Leonardo da Vinci should be played largo or pianissimo, or whether Kenny Ball his jazzmen will soon give us their rendition of the Mona Lisa? ENERGY SOURCES With the ever increasing cost of fuel it just has to mean that there is a great deal of research going into other forms of energy. Any cut back by the US military could mean that effort might be channelled into this energy problem. Just imagine what could be achieved if the effort on energy was the same as that on military space items. One area already bearing fruit is that of harnessing solar energy. Admittedly efficiencies are low, but then it's early days. Up till now, most then it's early days. Up till now, most people have looked upon the solar cell as a discrete "thing"up to 2in. in diameter. Not any more. One go- go ahead company has started to produce solar cells, well, not so much cells as strips. This manu- manu facturer is turning out single crystal silicon solar cells which are in ribbon one inch wide by six feet long. Efficiency is given as 10% so far. Maybe this method could outstrip all others? '0'3" a i There's a stard schoolboy joke about things on the other side of the world being upside down, hut but in electronics it's almost a true statement. Hitachi, the Japanese company, has developed a light emitting diode (LED) display where the light shines through the sub- substrate-sort of upside down. But before you say "Why doesn't some- some strate sort body tell them", think of the many advantages ot of doing things thin'gs upside down. First, it means easier produc- produc tion for people who are using these LEDs. nstead of individually wiring each segment to the circuitry, one can use flip-chip techniques where the contacts from each segment (because they're on the underneath side) can be bonded down direct. Again, in the more conventionally produced LEDs, the contacts on top of the diode tend to block off some of the light trying to get out of the top surface directly above them, i.e., from the viewing surface. n the Hitachi approach, the light is being seen from the other side, the side opposite to the contacts thus there's no "hoie" "hole" where these metallic ohmic contacts are. Another point is that gallium phosphide used in these devices has quite a large refraction index, index. Goody, goody say the Japanese coz that means all the emitted rays of light which strike the internal surface at an angle greater than 1T 17" are totally reflected back internally. Ah so grasshopper.. grasshopper,. time for you to glow!

64 A.FOORD Audio Oscillator selective network comprising resistors capacitors. The ~e basic diagram for the Wien Bridge type OSCillator oscillator to' be used is shown in Fig. 1.. Components Rl, R, R2, C1 Cl C2 form a frequency selective net- net work. n order for oscillation to occur there must be zero phase shift between the input of the amplifier the t~e output at only one frequency. The frequency selective network acts as a low Q filter having a resonant frequency: f 1 m 2nRR2CC2Hz 2jrRtR2ClC2 limdub ci \,R3 + Output High gain amplifier Fig. 11 1: The audio oscillator OSCillator is based on the Wien Bridge circuit shown here plus a high gain amplifier. At this particular frequency the network reduces the signal at the non-inverting (+) input to a third of that at the output of the amplifier. n order to maintain oscillations the amplifier must make up for this loss by having a gain of three. N N audio applications ~pplicatio~s a wide range oscillator is often used with an oscilloscope osalloscqpe or audio millivoltmeter to ro plot the frequency. response of an amplifier, filter or tone control, control. While this approach is invalu- invalua~le for design work, the basic equipment is expen- expen able sive may cost more than a modest hi-fi system. This 1:'his article describes a single frequency oscillator which whlch may be used for signal injection where an established design needs testing. Component values are a,re given for operation at 1kHz, the stard test frequency in audio work, but this frequency may be altered over a wide range if it is so desired. THE WEN BRDGE Resistance-capacitance tuned oscillators are essen- essen ~ally tially positive feedback fet;dback amplifiers in which the posi- posi tive feedback is S applied through a frequency 930 THERMSTOR STABLSATON ABLlSATON The circuit of Fig. 1 is a perfectly good oscillator in theory, but in practice certain difficulties must be overcome. f the gain of the amplifier is less than three, or the loss of the network more than a third, oscillation will be very slow to build up or at worst ma,y may not start at all. On the other h if the amplifier has a gain of more than three or the net- net work loss is less than predicted then oscillations will build up in amplitude amplitude causing distortion to occur. t is clear that some form of automatic gain control is required. n the practical circuit of Fig. 2 the resistor Rl R of Fig. 1 has been replaced by a thermistor TH1. The thermistor has a negative temperature coefficient, i.e. its resistance decreases as it warms up, either eithe; because of ambient temperature rises or because current is Sowing flowing through it. When power is first applied to the oscillator the cold thermistor will have a high resistance provided it has been properly

65 R1 33k R3 1Sk C3 0'01JjF AM018H t1 2V ~ < C1 2O.llF C llF R2 27k HMHE im Fig. 2: left, complete crcuit of "the 7 " Fig." 3 + fixed frequency oscillator. 3: S'4V UgkTJK DC for prnted "" JC1 below, layout (or the printed circuit 6 size. SN72741P board, shown actual size, together P CS with the component positions; positions. Output JjF control VR1,,socket Sk1 Ski capacitor ' TH1 R4 RS3 VR1 820 Sk C4 20JjF Ril rm K] M RS 1 Sk C1 Output 1V RMS at 1kHz C30. ~ OV WB ':::, Fig, 2: lefl, complete circuit of the C6 CS are mounted on the case, as shown " in the photograph. in the photograph.., '.H_1 i-_2_1_"~_' nsulated wire securing Tm PCB X_" " +12V Output (viavr & C6> Output (via VR1 & C6) OV selected will give the amplifier a gain of more mo re than three allowing oscillations to build up quickly. qui ckly. As the thermistor passes current it warms up, its resistance decreases the amplifier gain is main- main tained at exactly three giving a low distortion output at constant amplitude. A high gain operational amplifier type 741 is used in the oscillator but not with its usual dual power po wer supply. Resistors R1 R R2 form a bias network which produce a DC voltage of approximately ' 4V at the output. The output voltage then swings about this point. Resistors R1 R R3 in parallel are effec- effec tively the B2 R2 of Fig. 1. The gain of the amplifier is determined by the thermistor resistance R4. The capacitors C1 Cl C4 are decoupling com- com ponents. The output coupling capacitor C6 is smaller than might mig~t be expected for audio applications be- be cause the frequency response does not have to extend below 1kHz. This has the advantage that a non- non polarised high voltage component may be specified, allowing signals to he be injected into high voltage valve circuits if required. ALTERNATVE FREQUENCES As mentioned earlier other frequencies may be produced by altering the value of the network com- com ponents. t t is is easiest to change C3 C2 since the resistors also form,part of a biasing chain. f the frequency is is reduced C6 may need to be increased by a similar ratio. The frequency response of the 741 puts a limit on the maximum frequency of a few kilohertz. * components list Resistors R1 33k{i 33kO R2 27kn 27kO R3 15kfi 15kO R4 820Q 8200 R5 11' -Bkn 5kO All A!W 4W5% VR1 SkO 5kO potentiometer Capacitors C1 ZOpF 20f.LF 25 25V V C2 0-01^F O 01f.LF polyester,. r C3 0-01/iF 0 01f.LF polyester C4 20/iF 20f.LF 16V C5 10pF 10",F 16V C6 1ftF 1",F polyester integrated ntegrated Circuit C1 SN72741P (or any type 741) Miscellaneous TH1 Type R53 thermistor Sk1 Jack socket " PCB, case, supply terminals (2), knob CONSTRUCTON The construction is quite straightforward. A printed circuit board component layout are shown in Figs The current consumption of the circuit is only 17mA any supply sup.ply voltage from 9V upwards is suitable. Battery operation is quite feasible, thus making possible a self-contained unit. CH l'!! 931 rimvuil

66 1)llf))(Jf~rrf)N HMHM JCTKW J.. UVHS N~S colin riches CALCULATNG PYE Pye Pya Umifed limited are out for a slice of the 35 million calculator market. They are now offering three models all models-all featuring rechargeable batteries mains adaptor/battery recharger. Model Mode! is just a basic calculator solves normal arithmetical prob- prob lems (price 35-60). ' Mode! Model 640, priced at ' 70 has a memory store facility Model 650 (priced at 56-95) ' performs square roots etc. Pye Limited, P.O. Box 49, Cambridge. "SCENTFC" KT The "Scientific" pocket calculator is now available in kit form direct from Sinclair Sinciair Radionics, London Road, St [ves, ves, Hunts, at 19-95, Apart from the basic four (+ ~ - x ).;- ) operator keys the "Scientific" incorporates the following additional functions: logarithms to base 10, antliogarifhms, antilogarithms, sine, cosine, tangent, arcsine, arccosine arctangent. These enable rapid squaring, doub- doub ling x* xy ncluding including square other roots.,post fixed operators give full calculation facility on all functions. Entry result are in scientific notation with a signed 5 digit d;git mantissa a signed 2 digit expo- expo nent giving the "Scientific" acapaclfy a capacity for very large or very small numbers from 10-10_ to 10". 99 The calculator kit which is powered by four stard Mallory batteries giving around 25 hours of continuous use, can be assembled in around 3 hours. t comprises coil, L.S., L.S.1. chip, interface chips, case moulding moulding with buttons, windows display, printed circuit board, keyboard panel, com- com ponents pack (diodes, resistors, capacitors) battery assembly on/off switch, soft carrying wallet plus a comprehensive instruction booklet both for assembly use. The only additional equipment equipment re- re quired s is a soldering iron (1/16 inch bit) b a pair of cutters. Any queries regarding construction can be directed to Sinclair's service department. Sinclair Sine/air Ltd., London Road, St. /ves, ves, Hunts, PE1 PEt 4HJ. 932 mmmm CALCULATNG PYE "SCENTFC" KT 932 mmsm* BATTERY LEVEL NDCATOR BATTERY LEVEL NDCATOR Egen Electric have introduced a low- Egen Electric have introduced a low cost battery-level indicator. The indicator, which measures 16mm in height 22mm in width, can be mounted by a spring clip fixing to the case or to a PCB with solder tags. t lakes takes no current until an integral push-button switch is depressed. The pointer then moves into either the red or green portion portion the limits being set to match the requirements of the particular circuit it is used in by installing the ap- ap propriate shunt or series resistor in the measuring circuit. Details ot of prices etc. may be obtained by writing to Egen Electric Ltd., Canvey Road, Canvey sl, Essex, SS80PG. Road, Canvey sl, Essex, SS8 0P6. Stndalf Stenttfit tounlotbr hints oh' H0lderlnB_ RECORD CORNER RECORD CORNER "Goon Show Classics" (REB 177) is the latest Goon album to be released by the BBC Records Tapes Department comprises two famed good show broadcasts. Side 1 is the "Dreaded Batter Pud Pud- ding Hurler of Bexhill-on-Sea". t was first broadcast in 1954 tells of the investigation to find out who had the audacity to chuck 38 batter puddings at little Minnie Bannister. Side 2 features the "Mysteries of Pliny the Elder"-broadcast Elder" broadcast in tells of a football match in the E.U.F.A. Cup between the Ancient Britons the Romans. Not many comedy shows have had such a profound lasting effect on the British public as the Goon Shows though it is now over 20 years since the first Goon Show was broadcast, the BBC fee! feel there is still a tremendous interest shown in the zany humour of Messrs. Milligan, Secombe Sellers. Both shows feature these three plus the Ray Ellington Quartet. Quartet, Max Geidray Geldray Wallace Greensiade. Greenslade. The record is priced at is available from most good record stores. stores, rcirrw VCCC r,» iw'n: y-.-'i JV H, -fi.: : c ffx

67 UKA STEREO-8 STEREO 8 This eight-element model is the star This eight-element model is the star performer in the extensive Fuba aerial range imported into the UK by Audio Workshops Ltd. Designed for reception in the worst possible conditions the Stereo 8 will often provide good signals in areas where previously no useful signal si9nal was obtainable^ obtainable: Particularly suitable for long-distance reception, continental contin'ental or otherwise, the Stereo 8 is probably the highest performance f.m. aerial available in the UK UK as its development is the result of technical design applications by Fuba's team of professional equip- equip ment engineers. The model has a detachable Junc- junc tion box with correct matching for either 750 7S0 coaxial cable or 3000 balanced twin feeder. This feature, which is almost unobtainable from UK manufacturers, gives the UKA Stereo 8 unparalleled matching characteristics. The junction box is designed for simple, very easy cable fitting with no screws to lose. t will easily take any diameter of cable. Fitted with a double reflector for best front-to-back ratio, the aerial per- per formance is fully specified according to internationally recognised pro pro- cedures. The rectangular boom gives strength correct element align- align ment thus avoiding the "hedgehog" effect well known in n this country the aerial is designed for out out- door use, but may be left mounted. Clamps are supplied to suit masts of up to 2 inch (SOmm) (50mm) diameter. All alloy parts have a protective coating for longer life, steel parts are cadmium plated to provide protection from corrosion rust. Technical specification: Gain: 2 8 2'8 to 9 9dB 9-9dB (average 9 OdB). 9-OdB). Front-to Front-to- back ratio: 20 to 27dB (average 24dB). Sting wave ratio: Typically over most of the b, covering the full internationally infernationally agreed European b. Cable connection: Unbalanced coaxial cable or balanced twin feeder. Output impedance: mpedance: 7S0 750 un un- balanced or 3000 balanced, balun incorporated ncorporated in junction box. bo*. Audio Workshops, 29 High Street, Robertsbridge~ Sussex. Roberlsbridge, Sussex. EKCO ZU440 Another unit from the Pye/Ekco pye/ekco stable is the ZU440. f t is described in some circles as a TAPC/DJ T APC/DJ that's sales jargon for a tuner/ amplifier/player/cassette unif. unit. The "DJ" part'sts ' for "disc jockey".facility this. facility-this enables announcements to be made over the loudspeaker system whilst using tuner, records or cassettes. Output power of the amplifier is 15W 1SW per channel. The turntable motor is belt-driven the cassette recorder has a special magnetically-coupled clutch. A DNL switch on the recorder can be used when recording quiet passages of music to cut down hiss. TEXAN SWEDSH TEXAN-SWEDSH STYLE The "Texan U66", which we had on show at the recent Audio Fair is not available in Great Britain in kit form at the present time. Many visitors to our st showed a great deal of interest in the U66 which also employs an FM tuner with preset tuning controls. The phono input impedance at 1kHz is 47kO 47k(l sensitivity for 2SW 25W output is quoted as 3 4mV. 3-4mV. Tape input impedance at 1kHz is 100k!l tookll sensitivity is s variable with a 100mV loomv minimum. Tape recorder output is 100mV. Tone controls: Treble = ±14dB at 10kHz. Bass = ±16dB at 2SHz. 25Hz. Top Cut FHter Filter = -10dB 10dB at 1SkHz 15kHz - Mi. mi The ZU440 has a built-n amblo phony circuit which simulates quad- quad raphonic sound (they call t it "Stereo 4") when two extra speakers are used. Other features include switch- swltch able AFC, automatic recording level control, stylus pressure gauge four preset push-button controls on the stereo tuner in addition to manual tuning. The ZU440 ' comes coll')es complete with matched teak-veneered speakers with 8in. bass/midrange drive unit unt lln. 1in. dome tweeter. The recommended retail price of the ZU440 is '93 further details may be obtained from Pye Limited, P.O. Box 49, St. Andrews Road, Cambridge, CB4 DS. 1o.S. ' Loudness = +10dB at SOHz. Power output is 25W 2SW per channel with both channels driven. Speaker impedance can be anywhere between (1. Distortion is quoted as being less than 0'1 0-1 % at 1kHz (2SW). (25W). The FM Tuner section has three preset controls covering the fre fre- quency range of 87 to 102MHz. Sensitivity is 2p.V 2ftV the tuner features AFC. The decoder stereo se,paration separation is SOdB 50dB at 1kHz. The pilot tone rejection is greater than 40dB there is automatic stereo/mono switching. f you would like further informa informa- tion now, please write to U66 Eleir. Elektronik ronik A. B., (Practical Wireless) Vallgatan Vallgalan 8, Gothenburg, Sweden. TEXAN._ ~ ~ -.- UB.'. ~ i> l. *'... ~ - ".11 '.'<11" ", " 1111.' U 'UH l "';'" '. " :;:,' "::'".::: '.,., The U6S Swedish Texan amprdier The U66 Swedish Texan amplifier The ZU440 has a bullt-ln amblo- Loudness = + 10dB at 50Hz. iiisl-.! 933 '

68 SPECAL PRODUCT REPORT ULTRASONC NTRUSON / S 8 B HEATHKT GD-39 a Microwave - ^ ei 55 oo - ALARM "There are two transceivers in this picture. "There are wo transceivers n this picture. The one you can't see s protecting the one The one you can't see is protecting the one you can". WTH W the recorded recorde~ ncrease increase of petty theft by breaking entering of private premises, we were prompted to look around the market for a reasonably priced alarm system for domestic use which would afford a general degree of protection. n view of our previous experience of the Heathklt Heathkit range, which also has a high degree of interest for the home con- con structor, the Heathklt Heathkit GD-39 GO-39 attracted out attention, for this fulfills both our primary secondary aims. The Heathkit SD-39 GO-39 home protection alarm, as received, re!:eived, was well packed protected from transit damage- damage. Foilowing Following the manual nstructions instructions all parts were checked found to be correct. The easy step-by-step instructions were first read through then assembly was commenced. After a pleasant nstructive instructive two evenings of construction the 6D-39 GO-39 was completed ready for setting up. To avoid upsetting the household a low power 240V domestic lamp was used for initial testing purposes. ln n the assembly manual, at the commencement of the operation test, a "caufion" "caution" s is printed regarding the two screws used during set-up. Take heed, for this is important, for the threads of the screws,- which play no active part. after set-up, are tapped nto into the SRBP circuit board. n the event eyent of any reader making the same error as we did, for we overtightened one screw, a suitable screw can be affixed to the rear of the board, with a nut. With the normal amount. of trepidation holding ' of. hflil. eti t ic «o'» ', ol r ljh J ' '''~ tl C Q { toi/cl ~'.~ ", ue..",.,, \\! '!! {O 'd~o UO D ~t(1 ~~ ~op B: ~ '~ ~g~ :',c~~:~~~;u1v m. With the normal amount of trepidation holding'of 1 10»-!% f( XtiASfP K ro'ikunip (0* vmtt Op tiftpxiomi >1 ' '»» PM ><11 HO s ki<( t»ii ta»»s Showing how an alarm bell lamp can be used with the GD-S9. GD h-i \9 W.,E - a G!C <5 ft Top shell, shelf, Sift 9th book from he the left, le(t;the Hie Heathkil HeathM GD-39. MANUFACTURERS' SPECFCATONS. Operating range: Varies withinstalhition.typical' installation. Typical maiimum maximum range '-is' 25 feet., Operating times: Opera~ing tillles: Turn-on Turn"on delay: Approximately 10 to seconds. Alarm delay: 20to 30 3Qseconds (lamp-ontime). (lamp-onjime)...,. Automatic 'reset delay: deilay:20 to 30' seconds (alarm-on (alarm-tiri time). time). Ultrasonic frequency s Approximately 41kHz. Ultrasonic frequency:. Approximately 41 khi. ' Power outlets: Two AC sockets: One for Lamp, one for Alarm. Power' outlets: ;". Two AC sockets: O~~ for Lamp, one for Alarm... Power outlet current; Three amperes total for both sockets.. Power outlet current:,.... '. Three amperes. total for both s.ockets.,: Power requirements: or VAC, V A(;, 50/60 50(60 Hz, HZ,1 1 '5' 5 watts. Dimensions: Dimensions: Chassis only,2m only,2in wide x 9iin 9iil) highxvn 7indeep (approx- (approximately). n book-style cover, 2iiri wide x 1otin high. x Hin deep (approximately). imately). n book-style cover, 2iln wide x loiln high. *7iin deep (approximately). Net weight: Netw'eight:. Approximately. 3 lbs bs in n book-style cover; coverj approxi- approximately 2tlbs withput cover.. mately 2ilba without cover. breath, the unit was switched "on". As usual, we were breath, the unit was switched "on". As usual, we were surprised when all went well except for one "dry" Joint. joint. At this stage we must make comment on the excellent "Kit Builders Guide" which is ssued issued with every every Heathklt. Heathkit. t contains all the general assistance information, to give a beginner confidence to tackle these kits, even if for the first time of doing so. Our interest now was naturally how the GD-39 GO-39 would per- per form under varying environmental domestic conditions, the following tests were made, carrjed carried out n in a detached private house. Tuned to the highest sensitivity, movement of a 6' tall man could not be detected beyond 18' unless movement was man could not be detected beyond 18' unless movement was

69 C. T. ELECTRONCS V.A.T. ALL MAL ORDER BY O T CCPTE v.a.r. Unle.. Unleii otherwise olhorwlss stated siatatf all![ prices are 01 RETURN.G.O.D.SERVCE C.O.D. Ua C.T. ELECTRONCS LLLU Ollcea me EXCLUSVE o( V.A.T. Please Pleaie add 8% B% to all orders. orders plus WELCOME 2Op. 20p. Carriage: Over 5 otdeia poat poet free. tree. under 5 plua All mail order enquiries to 270 Acton Lane Tel: ::::~~~~ ~~ ~~~~1: ~~~ CRS11o'f R TRACS SEMCONDUCTORS 1 rlrall 77O ' i 2N2219 2N22t8 nm' 25 25p if" p 40p TXL228B aa 400V **SPEClAL OFFERS** AC107 35p MM17T2 Mp 2N22S2 20p CRSl/05 CftS/10 40 Mp p SPECAL OFFERS^ 85p AC107 3Sp BCY32 9Sp MM1712 lop ::::~~~g n~; ~~~~~~A ~~~ g~~h~ :~ TRANSFORMER. AC125 SC40D 1 ' 40 PR240V. SEC, 12V, l00ma Manul.: ~gl~ AC126 25p ~~~ 25p MPF102 «p 2N2222A ~m: :~~ ~~m~ MPFfM 4Sp TP35B 271 2N N p Z5P CRS1/20 Mp MNATURE SC40E 1 '65 Size: x F.C. AC127 AC1Z7 27p BCY (2N5457) 3Sp TP36B 3'50 30p CRS1/60 90p SC45D 1 70 AC12a 2Sp BCY TP41B 7Bp SOp SC45E 2 ' p.l00-90p ea.l,ooo-50p.a.l0,000- AC128 2 <2 N 5457) 35p 2N p CRS1/40 6Sp PR 240V. SEC. MANS t2v, 100MA TRANSFORMER, Manul,: Hlnchley 5p MPF104 2N2640 SOn CRSW80 SOp Sixe: 36 x 45 s 40mm. f.c. 53mm. CRS3/10 62p ea, AC176 2Sp 25p BCY70 22p (2N5458) (2NS4M) 35p 3Sp TP42B 9Sp 2N2846 2N CRS3/2O CRS3/20 62p «2p 40p Price ea. 1-5p, 100-«p ea. 1,000-Mp SCSOD 2 ' 42 ACBS 36p MPF105 2N2fiW 25p CRS3;40 SCSOE 2'70 AClaa 30p BCYll 22p MPF105 ::::~~g ~g~ ~~m: ~~~ m~!:~ ro'tj NSULATED''MANS ACY17 25p (2N5459) 40p 2NZ906 2Sp CRS7/ SOp 3 CORE PVC MSULATEOTT MANS DAC 25p ML66SO, 2mm. ~g~l~ ACY18 ro~ Mp BCii,2 ~~p (2N5459) lop TP31 C BOp 2Sp CRS6f1oo asp l00m looom ooom ACY19 30p 30 p OA4? TOp 2N2907 ACYM «p ~g'23 7S~ g~~~ OA70 10p lop ::::~~g ~1:~ ZN p ~~~~; 1 ~~: 2p CRSG'100 85p CABLE. GREY ML6850, 3x7/0-2mm. Price CRS6/2OO 90p ACY20 2Sp BD124 6Sp lop TP34C ' BO g;~:; /600 14:: ta. 0 ' 41 mld.sov ACY21 ZOO OA79 10p 2N3053?Sp CRS6/200 SOp 100m m- 3S. lo.ooom-esw. Size 0 '35" X 0'65" AD1<0 ~gi:j Mp ::~ ggm OA81 10p 2N p CRS16/ LNEAR.C.s C1Q6B 45p LM309K 5V. 1A. D 47 mfd.50v MYLAR FLM CAPACTOR. :~ g~~ 19~ TP35C N3055 sop Cl06D Voltage Reb" o l00-4p ea p AD142 A0142 SOP MP OAflO lop 2N30H BD!53 75p OA91 lop TP38C 3'74 2N p 90p 2.37V. A0149 AD149 Up OAS} 10p 2N SOp 0p ctoso 70p VoUsge Reg- Szq 1" x 0-35" «0-65" P.C. Mount. Price &GP BD56 75p OA200 lop TP41 C 90p 95p 35p lsoma AD16t 44p BDY lop TP42C 1' p 2BNT4, 4 04/45OOA '0 240V. operation; coil. Size approx. 2j. x 1!- x Uln. AD161 4<P OA20O 6p 2N3525 9Sp Wp o «. 1CiOO-3p ea. AD162 AD1B2 Up OA202 tflp 2 N D TC44 SSp LM723C 2N p BDY17 1 '60 TS50 40p 2 N 3702 Up 9 p 1'05 90p ea_ AP114 ~~m MP OA210 35p 2N3702 f4p 1 '90 150mA 2*a7V. 246V. unmarked OC11 transistors 1-01 AF11S»P rs~ OA211 35p 2N37M Jp 8T10/500A 96 g Voltage Reg. tionj twin A.C. coll. SOLENOD. Slxe appro*. Reversible * 1* * operal ln. 105 SOp ea. BDyt OA211 35p ~m~ 1~~ ~~m~ g~ 250mW diodes, 4 ' 1V, AF118 asp OC15 Mp 2N37M 5' 6 ' 2V, ' 5V, 9'1V, 10V, AFin ~m~ 25P rs~ g~,~~ ~: ggi~ OCi9 fisp 2N3705 «p 12p BRDGE MFC itW 30 unmaaed OC71 ranatarors t-0i!~~ m~ ig~ ~~g~g~ H~ W~2E~:~~~~.P T~~~ w~i: tested 1 AF18 Mp OC22 5Sp 2N37(18 12p RECTFERS Audio 75p Please state required. AS221 ~i i~ :: Mp OC26 fisp 2N p W02 1A 20OV 38p TBA800 5 Watt 51V, Unmarked fl 2V mW 5V. 9 V. Zener 10V. diodes. Measured 4-7V, ASY23 Up!fi~ 1~~ gg~ OC28 COp ::~ m~~ ~~~ 2N3708 ~~~;g; 12p BY164 t -4A 200V Audio 1-50 tea led -» 1~~ BY64 1 ' 4A 2oo~p 7~\~~l6~C 45p 50 OA41 t-oo BAKH «p CC35 60p 2N p 57p 709C Op Amp Piease stole voltage reauiied. PR, 0, BA112 g~l~ ~~ Up i~~t ~~ OC3e gg~ 65p 2N3771 1*70 MDA952/2 6A oj.lrrow 4Sp ~~ l~m i~ ~~~m!u! M?~e52/2 6A 80p ~:~~.~.!T2~~ ~~: 25-O V, 2tA, 4'50 BA114 «n OC42 40D 2N3772 J 00 1MV BOp 741C Op Amp 0/H 80 GE Diode OA47 equivalent. 1-» D..LTTOSS 35p TRANSFORMER: DOUGLAS PRf. Q DA156 :~n: l!p OC44 20p 2N3773 2*50 50p 15p ~m: ~g~ gg~ ~~~ N400t 8p. ::Y~:~~r~~sDES 7Sl~jual 7Sp BCt07 lap efx34 30p OC4S 25p 2N p ZENER DODES 748C Oo Amp 200, D.t.L. 75p + Mp 220, p.p. 240 SEC. 2S-0-2S-0-6V. 21-A, 4-50 TR.ANSFDRMER ecios :g~ Jp l~~ BFXS5 3Dp OC70 15p 2N p BZYaa SerFeo 747C BFX85 30p OC70 Sp :~:~ ;~ ~~~~. :~~ 3' 3V.33V, 5~% m'lwp ZN~rtRadlo n~ O , 225, , aciog BC109 14p 4p OC71 2p 2N3366 SSp 4O0mW Amp Dual Op f-m TRANSFORMER BFX86 30p OC7t 12p N4oo4 lop BC113 15p BFX88 30p gg~ ~~p N p 2N3905 2Sp "W :5 P 1 ' ' p 8C1»3 Sp OC72 20 p 2N p 3 3V-33V. 5% lip 2N414 Radio LC PR. 0. J15. TM. 205, SEC , TADloo BCHS Radl!'r:~~ :gm l? 1:~ p OC75 2Sp 2N3&05?5p 1-5W range SSp '2A 4-M+ SOp p.p. BC116 Sp g~~~~ ~~~ OC76 2Sp 2S~ :~:g 1:~ 2N4058 ~~:g~~ 12p 10W range 45p TAOW 1~~ 10 range 5p nc. Filter 1 90 acit? BCt p p BFYSO 25p OC77 OC77 40p?N4fl5g 12p (nc. Flllor Radio 1.C. 90 MULLARD TUBULAR CERAMC UHF 40p N4148 7p Up L.E.D. 55 ' ' BC118 ~ «P OCSt 2Sp 2N4060 fzp. en CA3014 Up BFY51 25p OC81 2N696 25p 2N4061 TL209 31p CA ' 2p ~ 10p BCM7 BC147 tip lip BFY52 25p OC33 OC83 25p 2N406T 12p CA S -SS TRMMERS (PROFESSONAL) TMQ ' ' ' n«n CA30ia 106 Type 092 2N697 20p 2N4126 l7p HP5082 2Bp CA BC148 Hp OG84 25p 2N4f26 ' ' lip m~ ~~~ gg~~9 ~~~ 2N698 25p 2N p MA2082R g~~~ 1.:: BC140 12p OCt39 30p 2r742B6 1Sp 7p HP^ MK CA3WB S-2'2p p 1 > Price lopea. wawuwr QUANTTY TELE BC1S3 :gl~ Tip 1~~ p 2N4287 Sp MA208ZR 20p ns CA g5 p p J BSW63 6Sp 0ct70 25p ~~~A 1~~ ~~:m 1~~ L.D.R. g~~~ ~n~ SC157 BC157 tip OC17i 30p 2N4288 Sp CA OUANTtTY Up BSW68 BOp OC171 30p 2N708 15p 2N4289 ORPt pF capacitor BC15B BC1S8 Sp OC200 COp 2N4Z89 Sp 15p BY127 ZOp gg~'1 :gp nn,!r- D ' R - a. CA ) PHONE DSCOUNTS PLEASE TELE- 2N930 ZOp p ~~~~e ~n~ BC169 Sp BY64 6Sp 75 P Miniature trimmers BC169 Sp OC201 60p 2N p ORP12 Mp CA309OO 4-85 OOOdF 2N p 90 NE555 lop MC13tOP 2'80 3'5-13pF BC1S2 «P OC202 7Sp 2N MC1303L 2-20 Mlniaturo Feedthrough tubular P.C. capacllor trlmmera Sp ea. 6-3()pF lop BCtSS ggl~ ttp 1~~ :~1~ a~ TP29A ::::~~A 45p 2r74fl7t 35o NE55S Timer 80p MC1310P i3oF 6-30pF Mpea. :~~ ~~1~ 1:~ ~~:~ 13~~ ca 1000 BCJ84 t4p TP30 55p 2N4903 1*14 BC186 :g:: 25p ::p ~i::? :;~ TfP3f A 57p M0 T03 VOLTAGE REGULATORS 4p c/o Varley 7001T relay SOp ea TP31A S7p ~~1~ ~~p ~~~r ~O t~~ 1~~ :~~! p U~ TP3ZA 69p ZN5191 MJ ' 25 TP32A 69p 2Nl306 25~ 2N5194 H~ 4SOmA 60 BC212L 1«p lip MJ2901 1'9S TP33A f NS p L03B LOOS 12V 5V BSOmA 600mA 2N307 25p SOp VERD BC213 f4p Up MJE340 SOP TP34A TP34A p L037 15V 450mA 1-66 ea METAL BOXES ALUMNUM BOXES DEAL FOR VERO N p p & P.K. BC214 14p Up MJE370 75p TP3SA TP35A 3 3' 20 2Nt309 25p p VEROBOARD. 8C301 25p MJE371 90p llp36a 3' SO 2N p p i" 5i" t" BC301 Mp 1 fp3 A» VEROBOARO' BOARD WTH BASE A R.K. SCREWS 0-t 0-15 AB7 2}-Long 5i-Wide H" High SSp BC302 23p 25p MJE520 15p TP41A 70p 2N p p 2Lx3j 2hH 32p 23p BC303 «P MJ '20 TtP42A TlP42A Sp 85p 2N p '00 2t x 5 BCY30 40p TP29B S4p D W 2j*5 35p.35p 23 P 3i x 3i 35p BCY31 ~g~g? 35p ~~ ~m~,5; l~~ 7P303 i:~~g: Mp ~~ Microwave ~~~~~ ;~~ M ~r~~:ve 3i x 5 41p QTY. DSCOUNTS: %: %: % Dlodo 3J 35p 3Sp 17x24- * 8 40p 41P 12+ x 2* x3^ p 3i ' SN741M 2 x 5 ' SN741oo 2' 00 SN '00 SN ' 72p DGTAL NTEGRATED CRCUTS 5N >45 M SN7416S x SN SN p 52p SN7400 lop 18p SN p SN p SN74170~4 ' 30p SN p SN7d27 tap SN p Mp SN p SN74(05-60 SN PN NS. TOOL 72p 72» SOp 30p SN ' OS 30p SN7402 Mp 20p SN7430 Mp SN7472 SQp SN74tO? SSp SN $ SP.F. CUTTER 52 p S2p 20p SN p SN74T10 BOp SN74170A Q PNS SS Up aop SN ' SN7403 HJq 20p SN7432 4Zp 42p SN p p SN7411$ 1-80 SN *00 SN SN SN p 55p 65p SN74177! ' &O OS 20 ' PANEL-DEAL PRE-AMPS. 20 SLlDER SN7405 sab p SN p SN p SOp SN7475 SSp SN74T1?» 1*90 SN PNS DS 30p 3Qp 50p SN747e SN7476 4Sp SN74121 SSp SN74lTe 1fiO 800 PNS SS!» 1-20 ALUMNUM BOXES WTH SLOPNG 45p ' SN ' AB20 a" g" Wide 3t" High back 2 20 SN7406 a< SN p Mp 50p SN p 2 00 & 00 3^ SN7440 6" SN p Mp SN74BO SOp SN N PNS DS TOP PANEL DEAL FOR PRE-AMPS, 20p SN7461 SN SN GO SN741$0 f-5s ETC., USNG SLDER CONTROLS 25 ' SN Electrolytic Capacitors, ~. K. Screws SN7408 Z 20p SN7441AN JS1 SN p SN SN ALSO STOCKED A 030 8" ' 50 SN Sprague, Lorlln. etc. Polyester, Poly 75p SN74fl3 SN SN SN *00 '00 SN74tSO ' A821 SN74185A 2' 20 Capacitors, SN7409 JJP 40p SN74<2 SN7442 7Sp 75p 90p F. O SN7410 p 2' t W-10Watt. Potentlometers; AB22 2' 60! 0 SN SN7484 Kip SN7dlS0 l SN SN741B4 J SN74tB5A 45 Elcclrolylic Capacllors, Mullard, 2" Long High 9' at Wl front de 8" 3f" Slope H gh at to back front 2 M Spiaguo, Lorlln, elc. Polyealer, Poly- With, R.K, Screwa ' 00 SN p SN SN ' 95 wlrewound, Preset, Rectilinear SN p SN7445 SNH45 1*70 SN '70 SN74M SN Sp p SN styrene. Silver Mica CaDaclto/s. etc. A021 AS above bul 10" long 2-» 2 00 SNl4191 1'95 SN p multlturn, Antex rons. SN744B SN ' 00 SN74t55 1 ' SN ' switches, tog{lle, SN p SN SN7491AN SN '06 SN741M 1-9S Resistors iw-lowaii. Potentiometers; A622 As above but 12" long '00 SN ' 55 SN ' 00 Cable. SN7416 Mp SN744B SN S 106 SN SN *95 carbon, wirewound, Preael, Rectlilnoar 1 ' 75 SN74157 ' BO SN '50 SN p 30p SN7450 SN74SO Mp SN p SN74ia8 ts5 SN mulliturn, Ante* Soldering rons, 20p 75p SN ' SN74195 'B5 SN p 21p SN7451 SN7451 Mp SN7493 7Sp SN741S7 f*m SN *06 switchc$, rotary, slide, toggle, etc. ELECTRONC 20p SN p SN741«0 tm SN741fi4 2*50 Cable, veroboard. COMPONENTS lop SN7416t 60 SN74196 SO SN7422 3Ep 38p SN4753 Mp 20p lop 60 Single 1 ' 50 SN7423 3Bp 31p SN7454 Mp SN7495 SOp SN *60 SN7416S f p SN7496 1*M SN M SN *50 POTENTOMETERS BARGAN COMPONENT PACKS SN '00 Pots 42p t 250 pack, 510r free SN7425 3Bp 31p SN7460 Mp 20p SN SN SN *50 Linear or Log Sfnglo Double 2' 25 SN7464 2'75 SN74t Rotary Pola 15p 4Zp ALL COMPONENTS NEW & UNUSED SN74164 Z ' 7S SN74199 SN74199 ~ CZ ' 63 U Rolary Rotary -Switched 25p 1 plus 2St) p.p. per pock, 5 lor 5 packs p/lree PecA Pack Wo. No_ Carbon T, t, 1, watt. * * Cerbon resistors, i.-j, 1. 2 wait Electrolytic Condenaers. Condensers. SPECAL OFFERS Ceramic, Polystyrene, Silver Sliver Mica, Condensers. MULTfCORE TCORE CABLE. ZS-wny. 25-way, individually ndividually screened, 9-WAY 14/0078. Polyester. Polycarbonate, 14/ ' 00 per yard-f yard+v.a.t. V.A.T. Postage hy by weigh!, 6-WA Y FULLY STABLSED BATTERY CHARGERS. etc., Condenser#. weight. 24" L. L, J-i" 1-!-" M, H. 7" 1" D. D. Price * each. * Carriage MHOFF19" Potentiometers. RACKNG CABNETS. CABNETS.13t" 134" high. high, 22"wide. V.A.T. Condensers. Polyastor. Polycarbonate. Paper, etc., 5 85 Potentiometers, assorted. wide, 13" 13" deep. Sf Br new each+v.a.t. each+v.a.t. Carriage , DEAC RECHARGEABLE BATTERY CASSETTES High-stab. 1%. 1 %, 2%. 5% reeistors. resistors. 13'4V (nom.). B/SA80351/108. encapsulated 1 50 Tagstrlps. SEMENS CONTACTORS, CONTACTORS. Over Overl 1,000\n,ooo n slock. stock. All All types- 13-4V (Pom.). Type B/SA 60351/108. Heavy duty encapauuled 7 W Assofled Tagstrtps. types. Size 3t" 2t" t". 5 OO+V.A.T. 1b. bolts. washer8, Phono Phone or or wrlto write lor for details. DEAC supply. Sire 3J" x 21" x H", Price 5-l»+V.A.T. 8 lib. Assorted nuts, bolts, waihote, spacers, etc. -WAY 999. METAL OXDE OXDE RESSTORS TR4/5/6 TR4/5/6 n in slock. stock. All B-WAY BATTERY CHARGER. Type CC 969. Charges Bpacere, elc. All up to 8 of the cassettes. U-OO+VA.T. vnlues. toggled, values. 1-qR l-oft pries price ip 3p each. each. Discount on on Quantity, up to B ot he above battery cassellee. Price 4 M+VA.T, 9 25 loggled, Assorted etc. switches, rotary, lever, micro, Quantity. 50 Potentlometers. CHARGER. Charges TURN TRMPOTS hy by Boums. Bourns, Mec. Mec. Palnlon, Painton, lc. etc. All 12-WAY BATTERY CHARGER, Type CC 999. Chargaa Preset Potenllomelers, All of batteries_ Metered battery. values n n Btock. stock. SOp SOp each. Dlscouol Discount on on quantity. up to 12Ol 13-4V DEAC bsllerles. Meiared baitery condition 11 Trial mixed component pack 1- Quantity. Check. check. RrJco Price 2S'0O+VA-T. OO+VA.T. 12 Jumbo mixed pack S. 5. We are open from 9.30 a.m p.m. Monday-Saturday. ABa AB9 4" 4" 4" 2i" t" t" 55p SSp AB10 4" 5i" t" 5Sp ABH 4" 2t" 2" asp AB12 3" 2" 1" SOp AB13 AB14 6" 7" 4" 5" 2" 2t" Tp Hp AB1S 8" 6" 3" 1 1. AB16 10" 7" 3" 1 ' 32 AS17 10" 4t" 3" t -to AB18 12",' 5" 3" 1 32 AB19 t2" 8" 3" 1 '80 We are open from 9.30 a.m p.m. Monday-Saturday. We have the largest retail selection ot of components available. Phone or write if you are in difficulties obtaining a particular component. C.O.D. service welcome. All mail order by return. Official orders welcome to Government. establishments, establishme~ts, Education Authorities, elc. etc

70 RECORD PLAYBACK HEADS AECORD PLAYBACK HEADS (TRUVOX) ndmdaftl ndlyldual prices there ate: 2 track iraoll, record prkfb pln^bftck of lbf*e hrxdj Ait: bead. Up &6p each. ^.. track t.rack record playback hfads be.ds fltfp BOp r*ch. eacb. E,... head. art! al80.,"auable,eparately 2 Ecmo track faeada irack 40p * aro 40p-4 track mlao bva flsp. liable arparalfly 66p. '.. MU ltetal mounting /'bielda 41, 2 :l track-hfadx metal monnung track-heads alreaily xhlelde alread:r ftjed <7p fixp.d on heavy each. hea"y iiiiiunliiig JlUlunting' ptalc plate vlth with ablefd shield '60. NEED A SPECAL SWTCH»»abl«Doabl. L«a! Leaf ConUct. Contact Very alfirbt alight premdre prerbu r e cloate closes ~.. -_ _ =bolb boll! cootacfa. eonta.ch. gp 9p each. each, 10 )0 BS5^ tor rot 7<p 74p rustic Pla,qtic pnahrodflult- pushrod lult Tool 00 m,,,0 rnf ahle for "PeratJug. opera.ting. 7p c»c!i, each, 10 for 83p. 0 C 10 fur 63p. J R.P.M. MOTORS-GEAR BOX. Made by the tbinouk Chamberlain & lopkliatrt R,P.M. MOTOR+GEAR BOX Made by the (srooul. Chamberlain & HookhaT Ltd. These,e made 1th'e clock 01 mllar. TbMe.hullar. Really could. robust be robwt rtltabk ftiade to reliable unit. drive dock or Price el 26 each. Frlee fl - gfl each, A with UTO ELECTRCAL dashboard control ewjloh fulle CAR AERAL AUTO-ELECTRCAL CAR AERAL... th duhboard controlswltch-flllly atendable.!:tend.hle 40ln!t1l1y r r 'ra(' table. '_ble. Aultaldo to 40in Suitahla nr for 1'JV or lolly 12V podure. re'racpo f'lth'f': nr or aaatlv" nl.. ath'" earlh, Mrth. Hnppllrrl 8l1rTJlf'd compwe compl,.tt' with ftttinll' lnst-ructions read} wired flitlnr dtshbaard nrtrucuofi# duhboard «w tch, switch. 18 e'95 BS ready plua lul'o 2Dp poet nsurance. 2Bp po»l And ifisuraocc. MANS TRANSSTOR POWER MANS TRANSSTOR POWER PACK De.lgned tu (,perate t.ran~i s tor it'ts ath) anapllfitrs. Ad]uttable Deilsned n AdJustahle otitpul operate OlltlJut Gv., ranamoraftaml 6\"., Hi*..!h-., 12 J2 veil* ampllflera. ' Oltll. tor for lip up to buqnia 'OOmA {rlflv* (d a s ~ it B uurkinp). workilll:). Takei Takes liir the place plllcf! ol 01 my ally ot of the follow foll(,will line!{ b:itterjck: mueries: 'f'i, P'], 'F3. PP:], PPJ. PP4. PTO. PPO. PP7. 'P9 PP9 nmi Rnd otberx. otherll. Kit K t (*<»liilirjrek: l'umpri~em: maina main. tranifornier trormer rectioer. Bmoothilll,! an~l lonti r ~ "j8tor. aoiulemoia oontiensera nnd rectifier, anti iuvinivlumr. emoothtng illstructioll~. Real nml Hr""1 gnlp loud reribtar, enlp at only fl-m, MNATURE WAFER SWTCHES T2 2 jiojo, poh. 2 way--4-4 pole, pole. '1 2 way-- wa.r 3 Spol.'. :1 way - 4 way-~, pole, pole, poh.-. 4 "' way 3 Way wnr - 3 pole, -4 pule, 4 way 3 y way ~ pole 56 whj way 1 pole. 12 way. war. All at 8to SOP e adl_ earh. MULT-SPEED MOTOR.. 1,100 r.p.m. hud tf.ooo. 12,000 r*' *-*' i MULT-SPEED MOTOR. 81* Stl: peed9 pet d!l are available an liable 600. (WO, M0 ano And 1,100 r.p.lo. 8,000, 12,000 ic.soo 16,600 r.p.ii). r.p.lll. Shaft r s * i n. diameter approximalely approximately 1 n. in. long. 230/240,. ta sp(>ed may beturthf!f controlled with the use ot our Thyriaf-r Thyristflr controller. Very powerful uvdul useful motor elze sin approx. 2 in. dla. X 6 in. long. ntijr, 230/240 v. fj, xpecd may be 1 J» forllier controlled wjtb Lbe use of L appro*. Price' il-oo 2 in. n oo plus dja, 26p x 2up pontage 6 n. long, postage «ud : nauraoce, lnauranct'_ SLDE SWTCHES f* ' flllde Slide Swllofa. Switch. 2-pole eb«ngri>ver cbangeonr panel lane LC mounting mouuting 6B.A. screws. Sze appro*, approx. tn by!in * two x ln 6B,A. lin rated ecrowe. 250V lamp. She lamp, P lop eacb. for 90p. Ditto &s abol.. e ~ «vr 1 for Op printed each. 10 printcd circuit fur 90j>. So Dltio 8p each as 10 above tor for 72p. but Sub 'diniature BUde DPnT 19mm din flob Mlniaiare 8Hd«Switch. DP>T Biam (fin approx.) fixing c(>ntrem_ 20p 10 lor apprcx.) for *1-00, H* between HP Chnnge Hxlng ('hang-." overaprltig eentrei. (H-er!llring return 2Clp each 2D0r or 2:50-v 1 amp. Qp. l5p_.15a E^gTRCAL PROGRAMMER U W T ^ V l fave ^arn radio ' n T^ur playing eleep: 1 ^09 ^3^-3D) "''"' boiljog as yon 1 - /ylv's.* - *wake witch on f M ' ycv.\ O \ \ v llglit* trudcrt lo ward have a on warm la- All tbch many ~ oilier bonne thing* to come yon home can to. do by f you famou* nvent maker in an with rlccirlxat 15 amp, programmer. cn/ofj ewuofa, Clock Bwllch-t>n up lo 6 iiour,'. ((mo nikpemkni ran bo ret anywhcrb 60 ndnute (a memory *1ay on logger. or with A BtxuA beautiful front, unit. olirolne Price bcrrl, 2-30 l 4- -GO 20p eatra. p. A p. BALANCED ARMATURE UNT BOO 100 ohm, operairs operates a*, R'..ipeafcer "'l)('aker or micro- micro su u~ f' ful ill iutercom lilllllar drculls. phone, f> c~rcujt9. 37p uarliil each, in liilercom or Mndlar each. JaA, VOLT 4 t AMP. Mrf. POWER PACK j/j power '. Thin pack This corllpri8es douhle-wound 2TO/240V romprigei matua (loublc-wonnj rantfonner ~, ihiw^wilh.,,;~~~2~?1~; full wave ~:,~:s rectifier r!~~ir;;'~~r::~., _'..' "gg -"f 2000 i m F flmoothlng, smoqtbing. Frlfe Prke W -'ifi.ju 50 phi* plur 20p 'lop post Jf & packing. pa.cicing Dut, Mainl racr. Heavy Duly Ktini Power Pack. Output 't"oltage arljustahle 15- lepa maiiinuin uutput Tollage a-jiisuble from 13-40V in.tep,,- ma"tituum load '250W--t hat is from at '40V to amp JoaU at 250M' -lhal SV. W\". This realty le ftuiu really s a 6 bigb amp high power duty witb workshop. Qbca. us~_ Output heavy duly voitwge unit volt-age adjualment with dozens adjustment la is verv of work very ffulrk ".hop quick imply.imply intercha uge push 011 lead.<. rectifiers nlerchangc pii»h on ler... Silicon recllflcrx slloothing 3,OOOmio'. 8'95 plus 100 unioothlng by S.UOUiuP. Price f 6 M pin* n oo pout. po~t. PC BOARD MARKER Valve Action fibre tipped marking pen rtlled PC BOARD MARKER \-ah'e action fibre tipllcd marking pen filled resist-it's with make with black a perfect etch 'C rcaiat t'a PC hoard. hoard, Just easy just draw wltb slraigbt this to straight on to the copper allow copper mlnntea minutes to dry, then inllllerlle cloride etchant linm-rse etcbant nn on feluoval in relllo\-al the ferric circuit ctorldr or other *Unila sts in high relief, 9ap. relief, Mp- 936 HONEYWELL PROGRAMMER HONEYWELL PROGRAMMER This TUNER lea 18 & drum Lype type timing device, the drum being GEe compan). calibrated calibrat-ed in cnual equal illvlslona \"i for swllch switch setting "i Vnil made by the American OEC enmpany. ajl,, ired Compleu purpoaes purposes with infinitely adjustable. condenaer, needs 8cale for position. wltb pollltion. They trips which are also are arranged nfinitely to allow Q 2 PPeJ* v- with 0 tranalstor, tuner condenser, all-wired ready need* to only work. scale Uomplcle operation* operations per awltch switch per routlon, rotation. There are 13 fi.polntcr. Hi ~~~!~~~.0~i:~, ~:range 540 to 1620 KUz, FM changeover changeovcr micro witches switches each of 10 amp type ^MQgn Tunes AM range 540 to 1620 K Ha, KM operated 3~t~e~~~~~n~~~Pa;~i~F~ by hy the trips thns thus circuits circult..8 may be foatput 80 for to 108 MXP MHi.0wlfcbe«or direct. Special for on-oft snip price APC. 5 post. free. changrd changed per rcvn]utlon, revolution. Hfivc Drive motor le 18 mains maln8 i.' Z' t plue 30p poaf- Three or more post frecoppratc-l operateri 5 revll. min. Some the uses this timer conlml, control. Jioller 6 rev*, Boiler firing, per mln. Mxpensing Home of ihc Dlflpensing many Vending w of machine*. bis Hmer ma.chines. CUplay arei Machinery Display llghllag 7 lighting WATT STEREO AMPLFER Animated animated!:ligna, Signalling, ew_ Price makcj'h!so As;ain.American GEe Tbis h.ah HpeclAl Special snip mip price Blgns, 7 airnnlling,, etc. Frlca from makcm probably over 120 each. Again 7'50 50 plus 23p 2Jp post POllt nsurance, insurance. Don't mlna mi88 this terrific except exceptionally locally by the good tone quality. ft EC company. J* 18 complete This with has wjth bargain. pre-amp yolume contralti control*,. Abo treble.a18o has mains base, smoatblng volume smoothing circuit balance TANGENTAL so requires mains transfonner. HEATER UNT rectifiers *o require* only maiua trustormee. 8peakers. nputs tuner, Thl* Ths healer heater unit is the very "Very lalea lates l t type, Output for 15 ohm speavere. npui* for loner, m ike. :. efficl(>nt, quiet U plj.s poht. Tbree or fla' A' :t: --:--T T ~...-: -j fitted 1,wt "flclent, n in Uoover H >iolct blower running. beaten. s as Special pick-up, snip mike, price etc. fi plus 30p post. Three nr heaters. more post free. Tf^1. ' ::.~.. ~~. /"1. C~mprise. motor, mpeller, e1e. _ Cnmprlex* motor. mpeller. 2kW, cle- _ : : -:.~..,.. cnl allo"ing..'tching, 2kW,. \ -- - '. '.~.. * 'il" "Nrucat allowing switching l. 2k W.., with thermal t.benual safety cut-out- cut out. Can be COMPLETE SYSTEM. fitted nto any metal line cbm case or fawff cabinet. cabnet. Only needs control switch. AM/FM switeh. Specifications v ', Don't miae mi88 thl». thi~. Conirol Cont.rol e* Switch, tch, Decoder mnd stereo MPX amplifier. Tuner SpeclOcatlons of amplifter are approximately &8 gh en. d<p. Up. p. P. A '" P. 60p. tuner SOp. a ab(lve. hove. ami Thl* amplifier Thlll * i8 ready ore built approxlmaieiy te»led as te"tcri»v*tem given "Yllt~1T complde,,!th ~e anti pointer. ready nliltall STEREO STEREO RADO RADO CABNET complete wilh acalo pointer, rcicly to nstall CABNET C~"~!!'J.!l low into aultftble suitable cabinet. four (Our big blli{ jilerso Ater~o cahlnri cabinet Long. r-nng. Low Modem.!\lodem. Teak *eneef«di veneered shuutd flhould be ideal with,.. itb flldlng sliding front tront taps tapered red leg*.. flfi US each. ba deal for this.) Limited quantity, Hpealcnr Hpeaker space* SUl Cf!S each end, end. fiirc Size appro*.. appro"t. *fl,.,t. 2ln 21n x 13in loin X x 15ln. 161n_ Probably tori COil AMPLFER PANELS onr 120 to make. Our Prce &8 10 each. f -. - moat < vez 20 lo make. Our Price *810 eacll TWENTYLTE. TWENTYLTE }'uoresr.ent lighunlt -olyealcr lluarcscent Volyester choke JlghUnc choke finished units finished while with ',,"hur enamel, 't 24 n*, m-. model. deal kitchen,. ~ bedrooni, bedroom, ha.llway, etc..»lib ~-F!!Jifi'D'"n'iiiiiJ 'with. tnbr. hallway, tube. Awmbkd porch, A ~sembl e tl ready lift, etc., to iu!ltall. Price 2' p p. &: p. install. Price p p. & p. THS MONTH'S SNP SOUND TO LGHT UNT [3 SOUND TO LGHT UNT Add Adrl colour or white e light to TOur your amplifier. W lt Will operate (maximum 450w) n Eo* Box all 1. ready 2 or rearly to 3 lamps work. {ma*ln>um work_ 7 450*) Unit in 17'95 B5 plus D5p 95p A'AT V AT ami awl posta{:e. poatagc. WK HORSTMANN 24-HOUR TME SWTCH With fi position programmrr. When fitted to hot water HORSTMANN 14-HOUR TME SWTCH With 8 p081tion programmrr. When fltted to het w"ter aystemf 8Y!ltem. thl* this could pro programme grain cue *... fullow*: tollows :- rrograrorna Programme Hot Rot Water Ceolral Central Qeatlng utina: P4 0 o Oil Twice Off Dally Off Dail) Off»VT~ Of! ;^5»-s J 2.All Day Off Of!. rrf 3 Dally Daily 4 Twice "' All Day Daily All Twice Day Dally. m-, ^ J 6 Conlinucaisly COlltinuQUsly Continuously Buliable Suitable of counie, couree, lo to progranune programme other than central heating hot water, water. for nstance, in8tance, programific progtamme upstairs upstalre dowruitalts downstairs electric beating heating or beating heating cooling ra.dio. limit to thl* thl!l Prurranmur. or taped music Programmer. Uatos MaiDl operated. radio. n Size fact 31b, there 3iD. x 31a. l«no 3in. X llmll x 2 a. lo the versatility of ~D. deep. Price PriCe i a* a. illustrated but les8 cue. AM/FM TUNER f) ~ 0. r:-.' (;. -.--~..... ~ ~.. Very nke looking, polished black preftsphan with fixing hole*. 6 phono sock eta changeover ijde Very nice looklnr. polished black presspban with ftxlng holell. 6 phono sockets changeo\'er slide witch."itch is s printed a* &8 sketch. sketch_ Price Prce * is 3to> aop. BATTERY CHARGERS BATTERY CHARGERS FamGDs Famous Ataa in cue \... _ - ~ meter, ontput Atla* n output lead* metal lead. lemiinated cm«with.» - - urminated ~~;~<~ ~. ~ by charging crocodile ~k~r;'!r;!ll~e. simply clip*. by :;r For changing 6 or )2t B-'-frt :h:g~~; V & :~ :. _. ". 8 ping plug buut ~ :' " ~.._.- new on front etlll still n panel. in maker's Ready original built ^'y~t~zzz-~ orignal ". "",-'. packing. models: tt oe Two 3-4 amp model*; , j Plea*e amp Please add 4Qp 40p postage poetalre for one sod 7Qp 76p postage posta.ge for lor two. t.wo ELECTRC MOTORS llluslrated but leas case. 56 motors Ued in ean SHORTWAVE CRYSTAL SET powerful powar battery power model*. nmtore modela. Output as u^ed type* lo racing typell vary care fo to ~ -:'~. ': ' " Although this rise* wes no battery t gives really amaafug amazing rcmlla. msko results. make suitable lor hundreds dlfferen',.. You wul will receive an amazing aesortmeni assortment of iutlona atatione over the projecta tool*, them nlublb projeeta-tooj, toys, models, for hundred* etc, etc. AU of All br dlffcreat n*w new &: <9 49 metre b* Kit hs-kit contain* contains cbs&sl* ch.auis front renrsible to 12v. Bata., dl.. ~ '.. pane! pa~el all the paru, paru. 125 cryetal fl'25-crystai earphone 60p. grams leverelble rams ncluded. for included. Post 10 lo l?v. VAT Bat*., fiopwiring dia- 8Op. 60,. F C D R C E C E Details miniatote =!~~r~t of power how lo :oo:er toata~o~ italloa rosk* MULLARD UNLEX STEREO SYSTEM There * is no ooubt Qoubt thai t.hat 1L it s is a -..._ NEW TEMS THS MONTH guod»yatem. lystem, we belldre bel1c"e that Cuaette Power Kit. a fcr for the tbe money t it 1» il without Car Caiwtla Powsr Kil. With» stabilised output 6v, 9v transist.ors, tomparlfon. comparison. We demonalrale demodstrate zeoer of fiv, zener diode, Bv or reslator* 12v. The resistors kit coodeaaers. comprises condensers. Price transistors, gladly at our Tamwortli Tamworth Road Bultaple case depot. dt'pot. Price Prices ot of the tbe ndividual x Suitable plastic caxe 40p extra. indh-ldu&l Blaak as in discotheques t'ffna items for thu: this:- ' / Black effects, etc_ wbite ljght appears untjl 1 DnUca Unllel: Amplifier Eef. Ret. EP.UOOO EP.9000 il-flo vjvkr / effccla, Light etc- Virtually aa used n no dkwolhequce white light appear* for stage until luminous 1 Ref. EP.9000 etc_ ofter 12" Sw compjete } Unllex Unite* Amplifier Unilex Prc-Anip Rrf. Pre-Amp KeJ. Ref_ EP.900 KP.QOOO EP.9001 *1-98 ll-flo shirts, the rays mpinge on lumfnoub paint or white Unik* Unilex Power Unit Hef, Ref. EP.WW / starter, etc. choke, We offer lamp 12' holders 8w tubes starter complete holder. with 2-76 Tubes 30p post. 1 Control panel kit with wi!h apun spun aluminium aiumlnium XV Recti4erl. replacements in TVs laced knob* la-slj 8 Price KV 2 Bochfleri, p For post. replacetnent* Tabes only 2 n + colour SOppost. TVb for really higb \,oltage Pair P ~~c~t Of 15 l~n~~~ ohm apeskera sp~~ken Tuadc '~lade by Goodman* Go!!!!ns ate are also al80 available a"\'allable f t reddlred, or required. doublers trlplers, FamoWl price the pair, pair_ h'o No extra postage p08tage f it ordered with ll ith the tbe above, above. otherwise douhlcra lor experimenting rlplcrs, etc. with Famous realty high maker. voltage 45p each for prices available. add 25p. Quantity l' Meters_ Meten. All price* Bush availsble, flusb oiountlng mount.lng with 0-2 amp 60p- 6Qv. amt> 80p. 76p p_ SPZCSAU SPEciAL PRCES TO COLLEGES AJfD AD RSTmmOH8 STTUT01f8 WSHlJfO WBB1fG TO 0-3 RecUflefl. 24\' (bri~ge) HCLDDE CLUDE THS KT K THER CUERCULUM Keciiaere. amo Wp. 0-4 amp 76p- 0-0 amp 86p. ClBBCULUJ fins. fin* i-2 amp All 24v 2JSp. full 26p. 3-4 wave amp (bridge) 86p, 85p. 6-T with 5-7 amp cooling 41* wa, Cable. Suitable tor wiring, 16 way aiuu-way Screen Cabl*. Dlulti-way telcpbone SulCabte telephone installation*, for equipment nstallations, ate. etc. F&ch Each core has ha.s seven strs strll copper, PVC JmmliUed insulated SWTCH otber TRGGER HATS colour coded differently from every Other MATS Ba So iliin t h.in ts is uhdetectablc uhdetecta.ble under carpel carpet bot but will wml.ltch switch on with core- core. Tbe@e are laid encased first slfgiitest slightest vrewnre. pressure. Forburglu burgjar alarm*, alarlus, ehop ebop doors, etc. by a metal These amen arc then screen ami tatd then together grey PVU. rncakil PVC. Price flral Mp SOp '24in Bin fi BO, metre metres 2'50_ 13ln l3in x Oln Oin i Touch or 10 me re* 5fl switch Buitable to 10 Switch. This aaltch suitable for up lo matns Sts 1"* amps lh rather mains like Jlke a voltage. a. jov Joy stick BLomls up no approximately matter which HORSTMANN "TME AND SET" SWTCH direction t it! contact. Baee f (A A 30 *mp amp Hwllchh 8witcb). Just Ju.t th* the thing f if yofl you want to com* come horn* llrcction home she!llze approximately il s pushed, Si* 2~" x it 2". makes :l"_ Price co/iiac(. 25p Up each- Bwe eacb. Lilitbt Switch_ Automatically switches U,&bts.. ~ ~» * to delay ~~:y"' a wamj lbs :~l witch 8':i~:~ bou*e without ~~t~r!~ on lime it'costing i~;c~~~geie~~rrc of your electric yon & fortuue. f:!~:tc~~o~pc: fires, etc., You Hp can Llxht tlmk oft "f ~. 14 hours from elting lettinr' time ot or you cau can Use use tbo the awltch.wlt.ch to give dock Swilcb. AutomaOcally svitoheo on VabV* at light lgbt. dark off at s dawn. a convenient Can also ('onvenlent way be l'-ay to used stop where ami '. ~.} : a booitoaperiod boost.on ofuptosfaouri. 3 bour. Equally auitablato suitabl.tc'coutroj coutrol l-ltart OlJeratlon. pair of '" procosalng. eurt an operation. Requires only a pnir ol wires procej8tng. la the Hwitch. bakclite Two model* models 15 amp 12-18, 2'S, 30 nmp amp :ta 35. P. A & P. 05p ~iip each to switch tbo plate normal sire. switch. size. 1 amp n model bokelltc $. 95. box normal TERMS: TERMS:- ADD 8% V.A.T. VAT. Send postage 'posu,e where quoted otk«r quoted-other J. BULL (ELECTRCAL) LTD. items, items. pose post free if order for these items ii is 6.00, otherwise *dd add 30p, (Dept. PW), 102/3 Tamworth Road, 30p. CROYDON CRO XX

71 exaggerated. At this setting the device exaggerated. At this setting the device was ultra-sensitive to the movement of curtains, within l' 1' of the unit, disturbed by the wind through an open window. At the lowest sensitivity, movement within nches inches of the unit was not de- de tected. The most satisfactory setting was slightly above mid-point, when adequate coverage of a room appro* approx 16ft 16tt square was achieved. However with the unit placed 6ft away from the open doorway of the room, movement was defected detected in the passage- passage way, to a limited extent, n in two adja- adja cent small rooms. This is due, no doubt, to "spillage" of the sting waves into adjacent areas, areas. Obviously, the best position for the GD-39 GO-39 will be, for genera! general use, at a point within the house which must be used to gain access to other areas- areas. Operation of radio TV sets, electro-mechanical relays, thermostats fluorescent light tubes failed to create an alarm condition, condition. Convected heat from a gas fire, placed in the proxi- proxi mity of the unit had no effect but a 3kW electric fan heater directed towards the unit, from a safe distance, did so, due no doubt to the high local temperature over ambient. ON OFF HSi^ RESET-HOtD SW4 SENSTVTY R3S LAMP AUTO RESET HOLD SENSTVTY Printed circuit layout showing Printed circuit layout showing component positions, sockets controls. controls, Disgram to show how three ntrusion Alarms may be wired to P'Ve comprehensive protection to a complete building. Diagram to show how hree ntrusion Alarms may be wired to give comprehensive protection 10 a complete building. The GD-39 has wiring options for either 110 or Z20VAC The GO-39 has wiring options for either 110 or 220VAC operation during assembly take note of the option instructions. During Ouring operation, or under alarm condition, this supply s is switched by an internal relay to two USA type sockets at the rear of the GD-39. GO-39. On our final installation, for we had obtained the optional extras, a.c. mains alarm bell, quiet buzzer with Us its transformer, from Heathkit, fhe the alarm bell was wired direct from fhe the outlet socket ( directly earthed), but the quiet buzzer was wired via a relay. Adequate information is provided in the manual for wiring options. We would point out to our readers, that n in event of a mains supply disconnection to the GD-39 GO-39 it is rendered inoperative. Normally, more sophisticated systems ncorporate a battery stby but this of course would represenf represent cost addition to the price. Ultrasonic movement defector detector suitable for providing audible or visual warning of ntrusion intrusion of a specific area. Can be connected by itself or with other detection devices to a variety of signalling devices or can be used for simple switching purposes. Frequency approx 41kH2. 41kHz. The device is housed in a case which simulates a book approx 10 x 7i n x 2}n. 2iln. This disguise could well prevent the device from being noticed by an ntruder. Method of function, An RF signal is transmitted by one transducer. A receiving An RF signal s transmitted by one transducer. A receiving transducer receives the transmitted signal monitors if it for a change n in amplitude. f a change is detected (pro- (pro duced by a moving object) then the lamp alarm outlets are switched on until they are reset either automatically or manually. The a.c. mains 61n 6in heavy duty aiarm alarm bell was mounted under the eaves at the front of the house. t has not gone unnoticed by neighbours local tradesmen. One question in -in particular that has been asked upon a number of occa- occasions-"ls it connected to the local police station?". The reply has been "you been-"you will have to find out!" out'" The large out door alarm bell alone mounted alone-mounted in a prominent position is no doubt a psychological deterrent to the would-be ntruder, ntruder. sions "s The Heathkit Heathklt GD-39 GO-39 is excellent value for money. nstallation of the basic alarm system s is extremely easy to install affords a high degree of protection. Top marks for this one Heathkitl The GD-39 GO-39 kit s manufactured by Heath Co., U.S.A. but is s distributed in the United Kingdom by Heath Gloucester Ltd.. Ltd., with a one year.warranty on all parts. The GD-39 GO-39 kit s is priced at The ndoor indoor buzzer alarm with transformer (GDA-39-10G) (GOA-39-10G) costs 5.80 the large Bin 5in alarm bell (GDA-39-20G) (GOA-39-20G) costs All prices include 8% VAT carriage (U.K. only) HEATH (GLOUCESTER) LTD.. L TO., BRSTOL ROAD, ROAO, GLOUCESTER GL2 6EH 6EE (Telephone GLOUCESTER 29451). GLOUCESTER 29451). 937

72 ()w t... equency & ma... ine PART 2 lew f reauency & marine pa 2 rt f 33^ ~eceive~ receiver CHARLES HEATH /oo ^ <Wa> AUDO AMPLFER This board is approximately 41! 2 x 2in both sides are shown in Fig. 9. The tags MC are fixed by 'jin 12in long 6BA 6HA bolts. Extra nuts on these bolts allow the finished amplifier to be mounted on the chassis sup- sup porting the tuning capacitor. nsulated sleeving will be required on most leads here. t will be found helpful to ' use black on the negative line, red for positive circuits, some other colour elsewhere. Solder on insulated leads for the speaker, for S5 (battery positive) from 20. C20. The amplifier can be tested by connecting a 2/3-ohm 23-ohm speaker, 9V bat- battery, feeding an audio signal to C20 taking care that this is not at such a high level as to cause over- over tery. loading. The pre-set resistor VE2 VR2 is initially set at about half value is adjusted either with the aid of a meter, or by ear. f a,a meter is used, set VR2 so that the amplifier draws about 8-10mA 8-l0mA with no signal. Otherwise rotate VR2 to reduce its value until audio distortion sets in, then turn it back just suffi- suffi ciently to overcome this. PANEL AND CHASSS t is necessary to assemble these before the circuit boards can be fitted. First drill drhl the panel for the dial, using the template provided by the t manufacturer manuf.acturer as guidance. Fit the ball drive as in Fig. 10, but leave - the transparent cover off. n order that drive gang can he be accommodated, 3 34in.)in has to be cut off the spindle of the gang. This is best done by gripping the unwanted end in a vice, meanwhile supporting the capacitor with the h while sawing through the spindle. Take care that metal fragments do not get into the capacitor remove any burrs on the spindle with a file.. The capacitor is then placed 'as in Fig. 10. Drilling positions for the bolts securing it, can now be marked on the 7 x din 4in flanged plate. pate. Holes can also be drilled in the plate panel, enabling them to be fitted together. Note that the plate is towards the top of the case, so that Fig. 10 is actually an underside view. These items can now be bolted tightly together. Check that the drive capacitor rotate smoothly. Should any small adjustment be necessary, the fixing holes can be elongated with a very small round file. Bolts holding the flange to the panel should be countersunk as they will be under the tuning scale. 938 m.. f) m The five controls below the main tuning are as follows: Top left: The five controls below the main tuning are as follows :-Top left: mode switch OFF CWSSB AM. OFF-CW/SSB-AM. Bottom left: BFO pitch control- control. Bottom centre: Audio volume control. Top right: : B selector switch. Bottom right: RF trim. Bottom right: RF trim. Note that just sufficient is cut out of each corner flange, as in Fig. 10, to,allow the side flanges of the case to fit. Secure the F BFO boards bo~rds in the way des- des cribed. The rear bracket supporting the larger board also provides a shorter earth circuit return to the gang.. The audio amplifier is on top of the chassis plate, with T2 towards the outside. COLS AND SWTCHNG The coils are placed as in Fig. 10. The switch will come in this position, but is above the coils on the panel. Connections from the board to the switch are as in Fig. 5. f there is any doubt about the switch connections, check the switch with a meter or other means of showing continuity, so that all tags for each pole will be wired correctly. Alternatively, check that proper results are obtained with coils for only one b, at,first. Then,add the second b check, check. finally wiring the third b. The coil pins should be clean, not heated for a lengthy time when soldering. No stress should be put on the pin until it is cool. Connections to VC1 VCl VC2are as shown.

73 SUPERSOUND 13 H F MONO AMPLFER A superb solid state audio amplifier. Br new components throughout. 5 silicon tran- 8istOfS plus ~ llower output transistors in push-pull. Full wave rectification. Output approx. 13 watts r.m.s. into 8 ohm. Frequency response 1~Hz-30KH7. ± 3dU. Fully integrated pre-3mplifier stage with separate Volume. nas!:! boost Treble cut controls. Suitable for 8 15 ohm speakers. nput for ceramic or crystal cartridge. Sensitivity approx. 40m V for full output. Supplied ready built am tested, with knobs, escutcheon panel. input output. plugs. Overall size 3" high x 6" wide x nil deep. AC 200/250V. PRCE nz 50. P. &: P. 50p. HARVERSONC SUPER SOUND STEREO AMPLFER KT Enioy fabulous stereo radio at this fabutous fabulous fow low introductory price! first-class Hi-Fi Amplifier 14 Designed styled to match our amplifier but transislcre A really fret-class tranllistors Enclnding Jll-Ff including SUcon Stereo S:licon'Transistors Tran-i'tcn" Arr.pJir.er fn Kit. jn the first Uses flw J4 five will Huit stard stages on e:l.ch channel e,'en noise, hicarporatea suit any incorporates the other very atondani latest circuitry stereo amplifier. techniques The tcchniqucb with design high* highgain. low Jow nofsc noise P F stapes. stages. Automatic frequency control to Daas, "lock-on" elation slation prevtal pre\'ent drill- drift. 1C C stereo decoder wiih J^-e! laces level with cr. improved each cbaqhcl sensitivfly. resulting sensith ity. ntegratc<l in even ntegrated prc-amp lower noise, pre-alllp with gain, saes, Treble with Ceramic or two Crystal Volume cartridgev Controls. id~ es. Very Suitable almplc for use simple to for ;(iaximuiu maximum stereo fparatiqn. Heparation..E.D. or for stereo beacon oxthhy modi!,.. [q to suit magnetic cartridge iu«lructions rtridge-il~tructions ncluded. included. DE E LUXE STEREO AMPLFER ndicator. indicator. Nominal output of tuner flomv. 100mV. Approximate Appro::cimate Output stage fcr lor any aly Rpeakcis speakerll trom ruin 8 lo to 15 ohms. Compact A.O, A.C. uintna mains size 12" wide wille x 8" deep by 21" 2i" high. Supplied ready deslga. design, all parl? parts suppllej Hupplied ncluding including drilled inrtatwcrk metalwork ~OO ~40 v. built, Y. (not in reauy drilled boan! U» sin n g kit form). fully tested fully guaranteed {not available n high quality ready drkllvd printed circuit board with component. iocnlilicalmn identification clearly niark.fl. mark~d, jmrsrl smart bru-!;rsl brm:hcd heavy July duty Ptlco Price P«l Post ami Packing 60p. 50p. anodlsed anodjlied matching- kllohll, fully isola solder, bolts-no e:ttra~ Simple :tcp led ted TtkaSne tsola- STEREO-DECODER wire, aohlcr. aluminium nuts, bolls ro front panel exlras with to buy. iiiatchlbg Skmpkknnlx, step maills step instructionli constructor (raiistorm transform - aizk SlZB 2" s :x 3" x 1" ready built. Pre- Prealigned allli Sens. ~0-5(i0 f 5 by proud Drief s!jccilication; er with cr wllh full alfgne«l tested. Hens, 20-5C0 mv m V amplifier etep instructions enable any construclor to build an output: wa.lts r.ll.~. into 5 ohm!:'. }'requcncy r csponse ±3dli 12-: Sem;itivity: wave rectl- for recti 0-16V n-16v ncg. neg. earth ooeratlon. operation. Can B" D. i aatpuc: 14 to w&tla be jirouil r.ni.s. of. per Bclef channel elivclllcation; iuto 6 nhnir. Power Fre- Mention be f i cat fitted n to almost any FM.1"31 VHKrylfo Vll}o' radio [ * quency i (J 11 bet-ter 80mV D[n. po\l'er hwidth: giving g-h'ing arlc- or tuner. ade Stereo bcaeou beacon fght light can be ' ib CS: belter i«ap«wc ±3dH Hz Jsensllhily! ±3dB 1~-i5,OOO z. approx. to ± 1'-!,lB. q u a ate t e flttcl tittecl if rv«iu1rcd. rccluired..full dclaila details *nu anti l - * ±3dn than SOmV Hz. into Bass MDboost Full apyrox. t-ower LuKlfh: in ijsdb. to -16dB. Ncgatin! feedback.l8dfi wiumihjdfj sllothiug wilu with nvgllriblc negligible hum. n^iructinih illstructiolls (nclusive (inclusive of hinte hints ami \ TiS Treble cut approx. tu Ncgallvc ledlbock fldb ovcr requirementh 3o\'. 1'0 Valve Vah'e line lint! u»:- up:- 'J:! x KCLS1 ECL8ti Ttltxlc Triode fculodea. Pentodes. 1 x EZSO lips) EZ80 tips) supplied plus lop. P. A &: P. i ' over O"eraU Size :!"\\'. 8"d. 2;;"h. aa as rmtifler. rect.ifier. Two dual poleudonielcn potelltiometers are provided pro,'ided lor Stereo for Stcreo liaccin beacon light C if required 40p jo _at Overall main 3lre amp. 2"w. Power x»"d. re'iuirementa x -ij-b. 35v. at l-b amp. bass control, gh'ing bass boost extra.. parts baas list Bp llus CHU cut. A dual treble volumeconlrol conlrof, giving control k is uwd, baai used. Jlnlance treble Balance cl of the boosl leli left Hat Fully free detailed with kit 7 or page send construction Sp plus large manual S.A.E. parti right h channels can be adjusted by niejitw means ol of a sepa- SPECAL BARGAN OFFER! r. &: >epa. BSR Cl23 De Luxe rate 'aalancc* Balance' control htted fitted at the rear uf of the chassis. Limited number of D3R C123 Auto Changer >e Lure AMPLFER KT P. * P. 30p input lightwcight npul nput aenajtivity aenaith'ity la is approximately a)proximatcly 300m/v 300mjv for full 3>calc with lightweight tubular arm stereo cartridge. (Magnetic nput components 33p extra) peak P." new output ol of 4 watts per clianncl chaullcl {«(8 wans walls mono). mono), nto into 3 ohm Br now. ONLY 3 CO + p. & p. 60p. POWER PACK KT P, & P- 40p CABNET V. P." A P. 46p 40p speakers. Kull Full negative negatin feedback la in a carefully calculatrr! calculated Hi i-directional slim-line conden (Post all purchase(l same time) circuii,!ircuit., auowa allows idgh higb volume "olullic levels Je\'els to be used with wjth negligible LATEST acr.!e r mlcroplmne Sensitivity microphone aa as u*ed ulled by Unl-dircetkmaJ many ptofe^slooals. Blfm-ltnc profcssionals. Very condca- low {Post Free if *11 units purchased at eamc Hme) distortion. Suppllc«l Supplied comiilcie complete with knobs, cliossla chassis slw ::ize acoustic feedback. fcedback. Available Availa.ble hi impedance or low m- PtiB Full after aftcr sales service serdce impellance. Stale State vfaidl which required '50 pluu pluh 25p ~5p P. A & 1* P ANo Ahm available ready hu«t built Ulll tcotcil tcstell Poet Post Free. built & teale*! tested to a lilgh high sundard- slalltlard '75. '.&P. P.&P. Sip, 50". Nalr: Tht! abotrr amplifier,', ",i{nqll' fur fuding tll'o Jl"* ll"w x 4*d. 4"d. Overall height including valves \,ah'cli 6", 5". Ready pedance. POWEB ACaS GP91/1SC POWER SUPPLY UMT UNT JOU/JtOr. ~OO/:!40,'. A.O. A.C. nput. Four LATEST AC03 OP01/1BC mono compatible cartridge with -Vote: 'otlrct'1 ijlto inputs (t!.g. mike, rndio, twill raord decks, elc. awitched tlo fltrlu!! LP/EP/78. Universal mountiug o!witched fully sruualhcd Hlloothed D-C. D.C. outputs giving 6v- 6,. anil t/o siylih for LP/EF/78. Unlveml moonting bracket. toriref* Thf ntev smptljur it luilnilf f*r ffedl»f htn mono (Hd will tluh mixi"g faeilitin jar med 1'46, &: 15p. 7h'- nv. end Ov. 9v. 12V- :!\,. at 1 Amp amp on load.! «, P. St P. 5p. >eiu nf't htii iapuls provide (r.j. mieiny mut, end radio. fading Hrin JaeUi\it» rtfird d/(ki. for rard- *le. pol'l'rtd fi-fi Di,cothNJlt. lt., l'tc. Fit Uni\'er~al Mountinl( Fitteri ted n'ulatcd ill!ollated output tfrndnalsantl terminal~ pilot lamp ndicator. CERAMC STEREO CARTRDGE. Ulrivcrral Moontinc ium poke'rd Hi-Fi 2?«fclft», oiie Mir. rte. indicator. Hammer brackets awl turnover stylus. iomv pcr output. flnwi finillh melal metal case overall o, t!rau slac size Q" 6" x SJ" 3i" x X '4}". bracket" ami lumover Mylllv. TOmV jfcr channel Output. 21" p al\(ll'. 5 3-VALVEAUDO Suitable for TratlsSsfor Transistor Radio!), io!!, Tape Recorders, Recon.ier::l, Atnpll- ONLY f tftp P. ami P. 3-VALVE AUDO Ampll- SOSOTOSE SOlOTONE 9TABC 9TAHC COMPATBLE STEREO CARTRDGE AMPLFER AMPLFES HA34 MK E ~~~lte!~,{::;t~l~ady PRCE P.4.P.35P. p. & 35p. T/O TjO atylus stylul Diamond Btcreo Stereo LP Sapphire 78. Designed DciFgned for -Fl Hi-Fi rcprodi\c- reproduction records. A.C. Mains ONLY 2 27 &: lop. ntteu VXJfAXS VYNAR & REXXE REXNE SPEAKERS & CABNET FABRCS Diamond T/O P. atylos A P. 10pstylul for Blerco Also available Btert':o LP. <2!2'76, 76. fitted P- P. A with &: P. twin 13p. 15p. ope.-alien. llon of reeordii. operation. Ready A.C- Really built Maine on 54 in.!l 30 yd.lengtb. P.,\: Uip TO 1 per app. yd. 51 (min, hi. wide. (min. 1 y<l,). Our yd.). S.A.E. price L-C0 for aampiea. yd. length. '. A P. 5p LATEST T/O STEREO / COMPATBLE CARTRDGE samples. for tor EP/LP/aLereo/70. EPLPBtereo78. < P. d & P. Sp, 15p. LATEST T/O TO chassis, plated chalisi!l, eiec heavy size 7i*V. gauge if"w. X x 4"d. metal 4"t. * x HARVERSON'S HARVEES0iV'3 SOPEB SUPER MONO AMPLFER MONO MOlO COMPATBLE CASTRLOGE CARTRDGE for tor playing EP/LP/7 EPLP f"h. J"h- ncorporates ncorporatcs KCC83. ECC83. A eujier super qualitygtaiuamp]illcr gram amplifier using» a double iround wound fully mono ilono cr or etereo stereo records on mono equiprnept. equipment. Only fl 1 47, i?. EL84, EZM EZ80 valve*... nhh. Heavy iaolated isola.ted mains radbfornicr, transformer, rectifier rectifler ECLd'i ECL82 trfode triode P. A &: P. 15p. duty, "Wound ma.in! o 0 pentode transformer trans valve vah'e a* a!l audio amplifier power output PLAYER MK. Stage. n rmer tage. mpedance 3 ohms. Output approx '{; *»U«. QUALTY RECORD PLATES AMPLFER MK, H ranaformcr 'taty. double wnnnd output ransmaina wattll..:\. top rt':cord pla.yer a.mpufter t':mploying Volume control wit.h improved lone tone controbt, controls. Ohwis ChaS!lia Hire liize only Tin, 7in. wjite A tup quality record player aiupllflrr employing heavy fomicr matched for 3 ohm wide tiuty mains trormt':r, EL84, X controls \'iog x 3ln. 3in. deep x Cln. Gin. hlgll high overall- o\'erall. AC AG malna mains 200/24{)v. duty 200/240v. an(1 Ballll, controls. Supplied Out.put 4, watts. absolutely Br New completely wired rectifier. double Separate wound maim Dau, tranafornier. Treble Volume ECC83, control*. EL84. wide speaker. range Separate tone ccnrrols volume giving ccntrol bass antl now with treble mproved lift transformer matched tested with good dualitr oulpnt ratuformer, Complete with output trarudorrner rtiatchcd for 3 ohm cut. Negative feedback line. Output -41 watie. Front panel lead.!! tested Wi~~ g~o~.q~~~ity ~~!~"d_!~~ls~o~rr~~ 4.20 speaker. Size 7in. wde 3in. dt':ep x 61n. Reauy P. & P- JOp RARtJAlV VKfCE A.U "peaker. mounting Complete with knoba, "ahtes, etc., hulit built Si:< tcftled. 71a. tested. CEtlCE wide x PRCE <5 3ln , 50. deep P. t * & P. 6n. 50p. high. Ready mounticg pauel can of he controls. detached Complefe anil Teads wflh extended knobs, valvei, for remote etc.. wired 6,50. &; PEW FEWONLYt ONLY! ALSO AVALABLE mounted on board with output erlted tested for only P. 3; P. 45p. outpul High grade main* mains lran«loruier transformer wllh with groin grail! orientated transformer trathlformer apeakcr. speaker. Pit PUeE CS 6-70, 16'70, P. Sl &: P. 60p. HSL "POUR" "FOUR" AKPLPSP. AMPLFER KT, KT. Similar in appcsronce appearance HAS4 abo.e employs lamination. Secondary 18'5 yolts 01 circuitry. set parto!!.!5'50 0'6 amps Primary volts 200/240 Yolts at :1 amps. Sccon«lary Size lfl-5 volta at 2" hx2k" h x :!t" wx advanced to 1A34 elrcuilry. above but Complete employe eet entirely of parts, dfferent etc w x overall. 1,35 plus P. & P. H F MK &: 2" d overall, fl 35 phis 25p P, A F. H-F LOUDSPEAKER SYSTEM HK 11 P. A r. P. -4Sp. 45p. BRAND NEW MULT-RATO MANS TRANSFOR- TRANSFOR DcauM Beautifully macc. 6imulllJ.cri enclosure Gil'ing ] 3 altemativcs ,'. autactive slatled front. Size Hi~" high m-f MERS. Giving J3 alternatives. Primary: v. with at tac(ivc fully mad slatted p. fdmulmcd fmnl. Sire teak finish crolosurc x 10}" 10/14 WATT H-F """ combination!! v. wine 9" KM.. Secondary combinationa 0-i-lO-15-2fl-'.'i;-30-3G-40-(](3v. wl'io x 0" deep (approx.). Fitted with E.M.1- AMPLFER KT , 20-0-:!O, v. Ceramic x 8" bass n.}'. st~' lilihly half wave at amp. or J0-0-J Qv. at Ccranilq Magnet 13" * 3" bs-m unit, D.F. tweeter A alyllehly finished flnio!lbed 2 amps full wave. 8lie Size Sin. 3in.long long y. 3^ 3Un. n. wide x 3ln.deep, 3in. neep. unit crossover. crosso\ er. AVALABLE N NOMNAL monaural amplifier Price 2 1: F- P. A & P. Wp. 40p. 4 Ohm, 8 Ohm to 16 Ohm impedance impcdance {stale (st.ate which). with ot MANS from TRANSFORMER. For tran^l.xlor tranl\i~tor power supplies eacb Ca".90p Prf. EL8415 Pr!. 200/240*. 200/240v. Oct. O-Q-9!J-0-9 at ma ,25. P. A &: P. 25p. OUR PRCE 9.S0...-b cr,.oop 14 watts an output fruiu of 2 ELe-ls in push-pull. 2op. PrJ.200/240v, Cabinet Separately 5'00, Carr. 90p nction Pri. 200/240v. Sec ~ -O-12 at i 1 amp. 1!l F. it & P. Slip. Cabiuel 26p. Pr.200;'.>40v. 8 ohms EM basil ot Pri. 200/240". See. Sec. iq-o-fo at at:! 2 amo, amp M. P. A & P. 35p. Also available Available in Separalely S obma with 5 EHf 00, C&rr. 13" OOp x 8" baae Super of both reproducllon music parn.sitic 8'00. Carr. 90p. negllgible 100 loom/ajdnclepolcnomwllv sin~le pole normally cloaed. closed. 2for 2 0Oo-H5pP.AP. 3 VOLT RELAT speaker with parasitic tweeter 8 00, Carv. JOp. speech, with negll- RELAY glblr hum. Separate 60p + 15p P.& LODDBPEAKEft LOUDSPEAKER BARGANS BARGAS inputs GENERAL PURPOSE HGH mgh STABLTY filn. 61n. 3 ohm 21-25, 1'25. P. i &: P. Sp. Up. 7 x41n. x 8ohm '40, P. A & ', gram nputs J', allow for mike allml' records TRANSSTOR PRE-AMPLFER 20p. x 61n.!2'10, &:: 30p. announcements TBANSfBTOR PRE-AMPUFtER 2Op. 10 * Bin. 3 or 15 ohm P. J: P. GOp. E.M., E.~1.. For F.tl. P.U. Tape, Mike, (luitar. Guitar, etc. aullable Ruitable for S B * x BlQ. 5in. 3 ohm with vdtb high Bu* flu magnet 21-70,!l 70,P. P- «&: P. 20p. to follow announcementg each other. U/~e with "ah'e transistor 9-lB\-'. E.M.. 13, Bin. shrouded section wound outpllt trall!jform~r uw w ib valve or translator equipment. O-Ov. RSL. 13J x 8ln. with high flux ceramic magnet with Fully ibroii'led rectlon wnund aulput transformer to battery or from K.T. H.T. line 200/300*. 200/300". Frequency parasitic paral'.itic tweeter 3, B or ohm !a 50, P- P. A &: P. 30p. n independent controll!, reaponje response 15Hx 25KHc- 15Hz-25KHT.. Gain 26d0. 26dB. Solid encap- encap E.M.. B ohm inbuilt base control" prodded Rize f' 1{-" X 2". crosso\'er 4'65, &: good lift 2 EL84s, ECCB3, sulation idzc 1J W K.M-. 13 x Bin. 3, 8 or 16 obfti with bbulll tweeter match separate speaker bare 2 treble mleperulent control* volume are provided controla. x li" x J". Br new complete croanover network 24 66, P. A P. 30p. giving gco llfl cut. Valve line-up J ELBJs, ECCfi3. with fnatrucllon.v. inst.ruction!!. Price 1-20?. 1 20p. 1'. P. A & P. 15p. K.M., E.M.. tweeter. Approx. 34". 3i". Available 3 or 8 B or 15 ohms, EF66 E:F86 EZ80 illstruction p, & lop SAE (Free parts), Bold sepauteb". HANDBOOK ~:lfj~g.fesof OF TRANSSTOR TRANSSTOR EQUVALENTS EQUVALENTS AND SOn. P. A P. Cp EZcO rectifier. Simple instruct ton booklet AND &: 60p. a'-ailable SDSSTTTOTES BRAND NEW. NEW_ Bakers Loudspeakers at subkcantlal substantial dis- ONLY + 10 BaE 25 P. Jf with P, D&p. part*}' Also All available parts ready aold aeparrdely. built dis tested &: iop. A must mulit for aervicemen lien-icemen home construe constructors. tecs. ncludlug ncluding counts. 12in. 5w. 15w. /D HD Speakers. 3, B 8 or 15 ohms. SUle rerico P. & P. 70p. State many looo'a 1000's of Brlllah. British, U.S.A. European Japanese which. Current production production by veil-known well-known Brilkh British maker. Uansiators, t.tllnsistors. ONLV ONLY 40p. Post 6p. 5p. Now No\\' with llfiux Hiftux ceramic ferrnbar ferrobar magnet aasenibl? assembly '50. H F H-F STEREO HEADPHONES Guitar mod ~lg: 25w 7'50. 3ul\", 7'50, P.&P. 45p. 8 headb comfortable flexifoam ear Reference Encyclopsdia* Encyclopedias for lor Electronic Eotrlcfler* Engineers CulUr mmlris: 25* 7-50, 35w P.iP. 43p. Adjustable head baud with comlortable flexifoatn etr- muffs. Wired with stard o!!tereo lin jack Deilguars, Designers. eovorlng covering between them t~em tranaialor transistor charnctcr- character l*l ca, response 30-15,OOOHz. btlcs, diode diotic anu transfatnr tran~istor equivalents. equi, alents. Many tliou^anil# "POLY PLANAR" WAFER-TYPE, WDE RANGE xnufts. Wirtd fitted With itaudard atereo iin Jack thouss obms. Easily convert-ed of up to date European types listed. ELECTRO-DYNAMC SPEAKER plug. liste(l lll" 14ti" t'.. 190z. Power & Diode EqaivalantB. Equivalents, 80p: SOp; Trangf«tor Transistor Equl»a!enU. Equvalents. Mp; Size J" x 14tt" x li» f " deep. Weight 19oz. power impedance Frequency 8-16 olime. icapome Koaliy converted Hz. for Matching Mono. 90p; r.m.s. (-tow peak). 8 Tranrislor Transistor CharncferlsHos, Characteristics. 1-15: 1 15; POST FREE All three hling20w r.m.n. t40w peak}. mpedance 6 ohm only. PRCE P. A P. 25p. Re~ponse 40Hz-20kHz. :>e 12in_ HRA" TWN LOUDSPEAKER. watt8 togethpr. together, i RcspoasB 40Hz-2{lkHz. Can be mounted on ceilings, wallt, walls, doors, under tables, etc., u«ed uaed with or without 12in ohm (state 3 00 NEW SSUE haffle. bn.flle. Semi Send b'.a.k. S.A.E. for full details. Only each. peak "RA" XW1S CONE LOUDSPEAKEP.. 10 wru* & 3up. ThyrUlor, Thyristor, Trliv:. Triae. Dlnp Dlac etc. eneyclopcdlaa encyclopedias B6p, 95p, Pout Post Free P. 4 & P. fup. P. it P. hling. 36v- 3 or «or 13 obn: (slate which) p. d R", watts, 8 pole 3 way 2 Lank bank low Jdsa O~ 8 Yaxley type *«-itche» switche!l }' NOW ALSO AVALABLE: K". 10 walls, r.m.s. 20 watt }t" 40Hz-20,OOOlz. ". Ri-Pi section). sections. Stard spindle. 2 switches 64p + lop P. A &: P peak 40liz-20.0CH>lz. Overall depth J". deal for JThP P. or for use n in cars fip 25p P. P- PRCES NCLUDE VAT P. Open 9, Monday to Friday* Friday Saturdoy Saturday (Pleas~ L TO. Cfosed Closed Wednesday. HARVERSON SURPLUS CO. LTD. {Pieasc write clearly) NOTE: &P. CHARGBS All prices pricel BpoclficMfOQf lpecificationl comet correct (Dept. (Dent. P.W.) 170 HGH ST., MERTOH, MERTON, LONDON, S.W.9 S.W.19 Tel.; Tel.: PLEASE H0TE:P. ftp. CHARGES QUOTED TO ONLY. at t time Of 01 press :.liable lor for A few rtfnvtei minutu from SsulA 80uth Ti'maie^cn WimbleJon Tuie Tube SSolion. Station. P. QDOTSD ft & P. ON APPLY 011 OVERSEAS TD U.K. CBDE3J ONLY, ORDER auanijod. alteratiod. SEND STAMPED ADDff 5S D ADDRESSED ENVELOPE WtTH WTH ALL ENQURES CeAROED CHARGED EXTRA. 939

74 lh.130 0;\95,34 1 nras -40 pclaa.ds BENTLEY ACOUSTC ~gt:;.70 :~~ 1 KT91 ~f~f :~~ >53! PCL83 ~gt:~.50 :~g i :UB^09 i/:t~ ::X <t ltdj~i:!:ra Difia«i AF21!~g ::~ 21 : :,~i~~ll~a KYZ13 :~~ 29 l-:cuh.60, 601 KZ49 EZ PCLSJ PCL8~,45.4[) jcbwl UDL21.77 JX4744 N4i'4.J A AF124 P FSY4L\ ':!5 LCL85.60 LZ.,n j'gl86.47 ljc9'j 2N AF \9 14 CORPORATON LTD.,60 LZ4L.55 'CLM.4" DC S AF123! FSV4A 1S A -25 -'io Lt..:L86.40 ezbo KZfiO.28 1'C;L805 lx;f.$rt5.55 UCC84 ucca N9<iG 2N91i ".4^ OAS Af'126 :20 j 0:\10 :47 :~~ 150 EZfll.29 PBN45.80 licc N1766 '55 Alo'\KO ~'a l ()~ M 7a GLOUCESTER ROAD, LTTLEHAMPTON. SUSSEX 1.50, 1< CYfiOl EW (.Y PKX43-80 L'CCM -4j 2X AFlxO -20 OAW PEX45D» -53 QM7 PEN45Di> UGF N AFJ86 :81 OA70 :17 All pricfls pr-ice. inclusive of V,A.T. V.A.T. Telephone Telophone ] 1:1-'4J.70 GZ UGH N UAlii 15 10\73 11!;F4~.70 j C237,70GZ33 «Z fiO : PEN46 'ENJe U(,H N23tJ9 15 U,\llli :200:\79 :10 OB~.40 16llA6 6 HAG tiL7.5011'.!Q7UT 4S':1!"Z 75 ' lj87/6 EFj3 1 (~Z34. PEN453Dl> veh8l.40 12N3053 :36 lla~9 }4 ' OA oz.a llC8 OUCH.606L :L!a.fi0il2Q7<:X 45,^ C7 50!3.:iZ4(.T DY~o:.!. 35, EF80 26 GZ3i uclb2.3s 2N OA85 09 lab.45 6HE6.356L19 2,001128G7 40:lllZ5Gl' CC 201 Ef<'!\3 1 :00.\BC80.60 PENDD- UCLBS.55 2N370~ 21) BA]53 '17 14 larigt HS eniig «neg.35 0L J2HL7-30) 0324CST UV87/ UV.vol '; PRX4S3DO L'ClfB.10 2X "UAl29-20 ( OATS OA79 * 2.00 UC N3J21 275'BA ;.00 i20':7-40j3625gt.76 K80CO 2-20 ' 2.co iiaiicao.ec PESLD- UCL3S.56 2X KAfJ -11 J GAPS OA D'10 751'1fH17 354' rao" 140 ErBii L:l V'41 2N37f1 BC A7QT «tu0.60 6LD20,.75 OnJ6 : 55 tai7gt :60 12SJ '00 J~ 831' 1 '301 EF HL23DV.75! PFL:!OV l"f42.\.all~ 17 ned8 14 i 10 lb3gt.6>.506b(,lia CHQTA.65 6N7(JT Ni <50»:8m' i.4d < i:k N37<'-' 22 BO07 17 OA90.44'-P,i 1.00 Ji03K 1.30 j.46.73dd.75 PKLMW -70 ff AA1V -17 nclos 14. OA91.556QiU.6012SQ7 65 1:iOB.i 'S5 E88CC 751 EF39.27 L-ll 1 00 j PL33 50 ' UF80 35 AAl20 17 nc Of! 14 OA'ZOO Q7U Q '85 KB8CC UUl ; < OAP5 OA200 l LH?GT.60t6B1t q7l:~T l'lsr (;5 E9~CC 60 EF91.!07,lll.'44~DDDD 22! l''8 3f p l' UU;' AA12P 17 Bells '28 ] L O. \20~ (6 1fjBH8 1 : Q7(M) 0U7UT.60 6Q7,M) 56 12SK7 14J7,75 60C5-80 K92CC.80i 1.37 lialdl* 2 23 OA2fi2 UH7 ~~ 60Cr> E80Y EF92". r 1 00 AAZ3 20 HCO '17 11 N5GT B RiU 14~7 S050EH ") '75 1 1!s~CC125BF9i 80 Hr.\30U1 50 pl8la 55 ljf89.40,.\.c07 17 BC1l6 '28 1 ('45 '19 lro lw6 UtHWfl. 40.go 8H7tJ.SO N CD6GJ25 S180K 1.00; ',60 «47Di> 2 17 OC44 6lt7M ' 7~ 19A05 50,OOL6UT 65 E1148 EFg8 lll'r pL8237 ULH.75 1 ACl3 28 BClS 250C46 17.BS.oinv? 76 OA OS GUT 60E» E81CC so: 1LV«« OC45 EU4B H1*S3 1.C0 i PL ~~1~.80 ::~ 10UZ6 :!:~~7.70 : ~g l bba? G 0 ~~~;;'l':: ;~~~ : A3,00.40 GSCTCT ) ~~ a6a3 ~~~~ -BO.:~ ~~~~ 1~~ : :~~:!.gg ~~:~2Al:~g ~t~! ::~. g~r~~ ::~ ~gg~ l~ l~g~t~ :~~. gg~~ :1: lu6.75j«c4 ' 47~ 1,,~,c~.!,(,' 3515^:7 ~ ~f"'.' EAOO.27," '.30 HFR3A.00 PLM EAT XT2-76 PL OU70 5S OC7 '4444 t ~OOL'~1 1-1'5 1'g"'o'c'(' 250 1;~HC80 bf ~T.U. OO PL504/i>OO l' li Y41.45 : AC128 '22, BC1'33 0 '22 ','l. UJ ~D~" -45.'JLV>C! "Q'. 1::,\tgl 76 RlPO.55 hth un. AC\3~ '22 BCY34-250C,. 25 ~OK5.65ftX;6 0»il KAm; KT4 -OO P1.5O4/60O OtTZ.55 11)CO lit5j ~O1'3 8090CG 240 ZA4'J.75' EL3~ 50 KTGS 2 50 PLfi UJO 1 AC ncy38 " OC,i 12 no 60 16Cg flgc OCS.10 SOCl.75 KA(:9J.75 f SK70'f 1201' B2.76 EH'SOl 761 EL34 KT81 i 1'U U2/ ACOS 22 BCY39 '28 OC.6 17 su OCDGOl.,00 68KTOT.44 6CD60 1 6BQ7GT 201' SG 60 ' ElS4. U EL! KTW pl " AC07 28 BCZ\ S cuBA COtiBA.25 flsqtot P4 pa OOCG ]60H '.760\60. 26A ;.OO ' HBJ 201 RL KTW6'.1! 50 PL80'l..96 U25.85 ACl65 28 BF OCi8 17 Q CL6 «CL V6GT oveut flvoo.17 36A G -BOi 1 ZAW 1.60 JiT44 KTCC l -75 or UO AC132 AC S3. TCVM ncv OC74-25 & OC73 OCTfi BAFBO.73 t 1.00 KT PL60S.80 ;EH3l 2-50 KTTT«11 60 KL' U19 U12/ AC167 1,07 ' AC JSC JB 22 BCZM 15CY OCTfi 42 OC77. ~6L60 fii iebc41. a766 1 ~Ls KTW PY33/2.50 U~6. 66 AC06 28 nfhi9 28 ne7s0 17 Q6GT i ficlsa 80 6X4 26Y KnC81 ~ 60 bfldo!l PV8l 1'3: AC BF DCS 12 3A4. 40 jocal? KCLBA -60 0X Lfl« EllH.20 > YGG OOf Emm.76; ^.00 KTW01160 KTW831C0 PAOtt OC78!6CM7 '756X6GT.452liZ"'G ROO 100rRflF80 19i1&LU 55 P61 50 PY8:.!.35 r:iii 1.50 AC llf17s 42 DC8D 12 3V4 70JCCU6 76 8X60T G KHCfll.36 f.00 3HLD6 PTU/S M78D i-ys; OCB '7016CU5.7~ ill6.75 ~5Ztj EOFS KL64 31 l'abc!lo PY83. U8 80 ACl77 81 nfbo 83 OC 'CB6 &A 66 16CW4 QCW< 1.76 THS, «oi;o 00 KP80 loo 7U; ~fiz &BFSi 32 BL85 Pca6.150 PYB8 U ACY17 '28 DFl81 44 OC82D 11 6CGa QOUl^K?.00 71* GOB EQK6.41; -30; t ' Ml i'ancao.38,.60 pr»2.36 OOSl D 56 fide7 ib D7 100 f EHL'Jl 2 ELS4.as l'c88 PYliOO ACY18,22 BF OC8S 22 OR4GY a0.so/6ljtli \ SOA5 85!lOOG 1 Ecse io ELUl PCU5.60 PYliOOA U301 '661 ACYl:, 21 BF OC u.a r Bl>T«A ) P* -63. felucs.3 E.44 PCse.CO 1 T-VSa C82 h'ves OCP2D 40 '40 iflljw'o -73 7R A5 00 nurn -60; E1L ^.88 PC09.80 'YBCO.S OC83 fibw6 7St7Y SO ACPEN OO Ecaa EL3hO 120 PCG;.38 )Y800 1; ACY'lO 20 DFY DV.G fiec REG OO7Z~ 724,73 30C1S.86 'ioog -30 EC68.70 E.80 30C17.80 AGPE^ > PC57 rcss pybooa OC94 'YMO.40, 23 OCi23 MCl7 AC'J/PEN/ RCU2 46 EL;:'OG PC900 PY801 U ACY21 21 DFY OYSGT AK S~'.76 7~ l BD7 gd QC1B.80 ACS/PEN/ EGSa.45 E.90 'COOO.48 pyaoi.401 OC39 30Cl8 DD ECC33 1 :L, PCC.. \,7,30.48 U ACY22 17 BFY (; OZ ! flffiq 6FGO C OF5 Fb.80 D> 100 3CCSS 1.60 > 1-23 PCC84.40] i'zso AC6PEN 60 EC'C35 96 Emo 'CC85 QQ"03/10 " Acn8 20 BYlOO 20 OC72-89 OZ4G 45 '45 «'J3 OF D'7 3WLl.67 AC/THl U Eec.o 1-00 EMS.86 PCCS8 \'P23.75 ADl40 '40 BYl4 20 OC OZ4GT ' F14 6F) UK FLL.BO.07 Acei'EM.eo \C^TJJl il ECG3B rcc8b.44 4< V03/0 2G iof 10F FW S0FL2 EC'CJO 00; '.85 rccsa.80, A,OO 1.00 llccsl.34 El18'.56 POCS9.50 Q"751201'00 \'Ul.80 ADU9 65 BY C G/80V2.80 BKS 6}'-'18. ]OF9 30FLU. ATP4 50 ECC8~ EM8".40 'COB9 l)h!li)/lol'oo 'T:.!O.ADl61 50 BYl!!7 20 OC202,4., 6A F23 flp QF&,66 30FLJ3.07 VL60 1.C0 ECC61.04, y.65 'CCM.60!] QS75/ OC ^ ECC87.33 S,40] PCC109.57: owj/loi-oo vn-n 1.00: Apibi , 101'18.66'OFL3.56 AZ ECCU.33 EM 'CF80 '40 Q\,04/1'00 \'l'leoa AD162 6O BYZO 28 OC203 ' F24,60 loklfl.65 30FL13.66 A ECC&S ti}' LDll 30FL14 781"Z31 ECCS. EAl87 1'<:F82 40 tl AFl\4 28 B\'Z OC204 '83 SAOo.27. 0F29 S'25 1,8b 10LU1.70 aopll4 100 OP3.7530L16 AZH.28 ECCU. 1 EM~'03 PC'M.~9 T \T AF15 17 BYZ2 28 OC ~1:56-60 ::~ 0F28.00 ions.75 30L1S.78.76,12.11 AZ*i CG ' fi f L.flO! PK80 40,. QVO4/710O VTSOA :A> l-cka'j Kl9.60 l.m AK14 OC204 ECCii.40 ~g~ 101'1< L7 EL63 2 '00 ECC86 86 KY51. PCFS..60 TP ".' TRANSSTOR SETS' J0P U7.70 B.0S 2-QC eak (i'5lr.60 13A6 6Gfj{}.50 12A~ ].00 30P43R CL3S 1.00 ECL'Bb 86 B 3 2 'd«1, D POM P4MR el3s t~~ :gg~:9.:: ~i:i :: ~ ~g~:~~ :~g g~:~j:o ::g ~di9 t :g LPlli (AC1l3. AC164. l~c57. AA120) 'G 8p OAK6.60.BO BOflA ACG.70 -DO GVJC 1.00 ECOlBO ECCaa K.40 PCFSO.50 (AnWO.40. TP2fl2Cl-frj W73» l.co MATCHED P.64 'CPSP.fifl: 60HBA.~g i~!d~ :~g!op12 : ~g [g~ ~f.60 ECF80 EY84 PCF l~b~-n.60 ~\]"Ol f~8c~~' ~~2~~1~i~ :-47P~~~O~~~ D. & OAM8A K6 COK$.76 13AD« AK6,86 ami 12AE P1W.80 cyai.ac 30P19j DA,gl DA B.30 F.CMO ' 'CFSOfl.fiO ll'bc41 UAF« XflS 1 25 LP16 (AC13. TRA5SZST0R AC1M. AC137- BETS: AA203 BSp r«rpack. OCSiD A 2~OC8i. 47p. EOFU E0F89.45, E EY87/ rchsoo PCH u UDCBl [lcs].43 v-vn tex.45 Zw o")~ocs2 '63p Set of 3-0C83 '72p 6AN8-70 BUT? 6GU7. l2at6. ::SOP4.15 DAF96.50 EOF86 ;751 M.. >45 «HC«T AT8 12AU« OOJ'Ll 30P4.76, S6 1MK9Q DCOO.60 EOF06.75; 2 OC82 OC44 A Mp. C-OC ef 3 OC83-47p. 1-OCS2D- -729,.00 EOF804 u :~:: Jil 80 6JBGT mogi :~ Hm Jg ~mh A~ ~1::1 Jg :~:;::4t~ 1 ~it~e~:~i~u~~~ured _ FOR CASH. LOOSE OR BOXED, BUT MUST BE NEW. OFFERS.00 6J AV0 6AT6.45 fijto.30 17JA PL13 30PLU >V9 nf9« ECU , 2.Q0. K VALVES. MADE BY ALSO RETORX- REQURED FOB CASH, LOOSE OR BOXEO. BUT BUST BE SEW. OFFERS 6J ])E6. 130PLHi.90 ECHS6 goods lllsed a.nd fiuhjcct ",the 1<tanLlartl day R'uarnnt.ec..or cheque With onle~ only BAU JUBA CJlfSA.80 12DES.60 aoplia 75 12nH7 3lSA3. 65 DKt~ ECH42.701?esJ)atch charges:-orc!crll Lelo~~ v, a(~d lop t~tal to three tcms. thell each~t1lhtlf)nal eave.45. OKTG A3.80 DK40.70 ECH All goo.!* are "muscj ami wlijcct to luc nlanilarj 90 tlaf ttuannlee. Cash dieiue wilh t.f.!tr en!\* 6K7G '2C 12El ' 55C0.«DK91.70 LCU J u Duualdi ctelnjc*; OiHcrt hdnw 5. 9>L 0p latal tc cover up to (hr" lum«. UtcnoclMiLHkonal 35C DK9G DKtG ECU81 ECH tem, 3p cutra, t!dra. Onten Ort.ler~ fmeero bdwecll 3 ~v anrt 10 1:10 ml-i a.tll 25p _5p.total. (ofat. OrJera Orden o*-er oyer CJO 10 are post. fire. fr('c. Same. dav Jay 1 ea WBA.9516K8G. l2j7gt. SliD K60 DLU6.55 EC18S.44]tlelPatch. Any parcellllsured ag:l"l\st.t1atlla~e n tramllt for 3p extra. Terms of busmess eax4-75 8U.75 16Ll J7CT :. M 00 12K5 12J{ D MCT >70 DLOG.66 ECHBS.44 V 3lSL6GT.76 Dr.l70.60 ECH64.U\ f;e{' un reque.'t. )[a!y ot her.':! 111 f'tock too nurnerou~ to menton. enbg 80sLOOT.301tiLGGT K7GT 12K7GT W4 36V'4.75,50 WT70.00 ecusj.44i free ilr«paech. on reiiueil. Anj* parcel Many invurrl at ben* afialinl in vlock 'laenace loo n mimerou* trunttt lor (0 only mention. *«p per parcel eitrr.. Term* f bu»lo"*.so!dm71 D ECLBO ECLSO.55 'csm Jlease enclose enclose S.A.E, B.A.h. for Cor rei'ly reply to to any any certcsponjeike. correspondence. rf., Become a radio 'amateur. Lear~ho~ Learn how to. become ~eco.rnea a radio-. amateur iri in contactwith the whole - world. We. give giv~ski!h:!d skilled preparation for the G.P.O.licence ~ Brochure, without obligation to: U BRTSH NATONAL RADO & ELECTRONCS SCHOOL, Dept., w.b.25 P.O. Box 156, Jersey, Channel sls. NAME Brochure, without obl igation to: BRTSH NATONAL RADO & ELECTRONCS SCHOOL, Dept., W.B. 25 p.a. Box 156, Jersey, Channel sls. NAME ADDRESS Block caps please, 940

75 8 R16 o m rittl Cb e ce Tr6 M o 0 j EY o VR2 m. ~~: ~~, 0 b eoc Tr o 0 o T2 0 0 ej.d 0 0 o 000 S5 A f's' S: above, gives full constructional information on the audio... Fig. 9: above, gives full constructional information on the audio circuit board, board. T Fig. 10; below,shows the wiring required between the b-change switch the various coils n the aerial oscillator stages...., Fig. 10 : below, shows the wiring required between the b-change switch the various coils in the aerial oscillator stages. as 1Z2 fc'i MC C6 C1.S2 e.l L2 ]$<S S2D >4 ^ W ^ 1/ r 101 MC Li L2 L ' J 8.L5 7.L6 cut out L5 Q L3 cut out- LOUDSPEAKER The speaker is bolted to the side near the chassis, the aperture being covered with material or per- per forated metal leads from T2 secondary passing through the chassis to the speaker. This side is bolted to the end flange of the chassis, fixed to the panel with a a self-tapping screw. Remaining connections to the volume control other points can now be completed, enabling the receiver to be tested before adding the remaining side, top bottom. R16 RS is soldered "directly on to VR1. VRl. Connections are near the panel so that the PP9 battery can rest between the boards when the bottom is added. F ADJUSTMENT f a signal generator is available, use this in the normal way to check the alignment of the FT's 1FT's at l-6mhz. 1. SMHz. Should any cores need adjusting, a wedge- wedge shaped or (lr metal tool must not be used, as if a core is cracked it may be impossible to remove. The TT5 tool available from the FT 1FT maker, is recommended, or a similar core adjusting tool if.jf this is unobtainable. When no signal generator is available, tune in any stable transmission found, removing the aerial if necessary, so that volume is not too high, even with VR1 VRl well advanced. Each core can now be rotated slightly, as necessary, for best volume. Very little adjustment may be required, but each core should have a definite peak giving best results. Once the cores are set they should be left without further adjustment. 941

76 ' x This shot was taken before the lop of This shot was taken before the top of the cabinet cabins! was piled, fitted. ft t shows the audio amplifier board of Fig, Fig. 9, with the coils L1 to L6 mounted at the left. the colls if lo L6 mounted at the left. ' x. t v.j RF ALGNMENT B 2 is probably the easiest to align. f a generator is available, set LS L5 core to tune 470kHz with the gang fully closed. Otherwise tune in a station of known frequency near the LF end of the b, adjust L5 core to secure a suitable dial reading. With TC TCl about half closed, adjust L2 core for best volume, tuning in a signal a little removed from the extreme LF b end. TC TCl should then be rotated to allow signals to be peaked up for best volume at any frequency throughout the b, while not being fully opened or fully closed. L2 core can be slightly re-adjusted, re--adjusted, to avoid unnecessary modifica- modifica tion to TC TCl when tuning through the b, both cores can then be locked with 6BA nuts. B 3 is dealt with in a similar manner. The F b end can be found by tuning in a signal near l-ssmhz l ' 55MHz (1550kHz). This b includes l-6mhz, 1 but reception is impossible for a small :;mall range of frequencies each side of this, which is common to the F amplifier. After setting L6 core to secure suitable coverage, the core of L3 is adjusted in a similar manner to that employed with the MW b aerial coil. B 1 can then be aligned noting that quite small changes to the positions of the coil cores will have considerable influence on the frequencies tuned. However, the adjustments of each range are separate from those of the other wavebs. BFO ADJUSTMENT Tune in a stable signal, such as a MW broadcast statioa, station, half close VC4, with the switch in its third position, rotate the core of L7 L 7 until a loud heterodyne is heard. L7 L 7 is adjusted for the silent or zero beat heat position. When this is so, rotating VC4 either way should cause an audio tone which rises in pitch, pitch. CW will be heard as a clicking sound, if strongly received, is made audible by switching in the BFO, rotating VC4 for the wanted audio tone. n some cases having VC3 one side of the zero beat position may give greater freedom from interference than if it is placed the opposite side. 942 SSB signals are most likely to be heard in the MHz MHz region. To render these intelligible, tune in correctly, then with the BFO on, adjust the BFO frequency slowly for best readibility. f the BFO is the wrong side of the SSB. SSB, it cannot resolve the signal. The lower sideb is normally transmitted ttrensmitted by amateur stations, the upper side b is used by marine stations in the T6-3-8MHz 1 6-3' b. f the SSB is very strong, better reception is possible by detuning TC TCl to reduce signal strength. There is enough coupling from L7 L 7 due to the proximity of the boards, but this can be increased by running an insulated lead from BFO to Dl. Solder the lead to the junction of C16 G16 C17. Run it across to D, Dl, avoiding the battery, thread the insulated end through the board in the hole adjacent to that used for the positive end of Dl. No actual connection is made here. CALBRATON CALlBRA A temporary pointer is provided, scale mark- mark ings can be made along its straight edge, which corresponds to the hair line on the usual pointer or cursor. Dial markings can be obtained by any of the usual means. That is, from a signal generator; from known stations; or from the harmonics of a crystal or harmonic marker. After calibration, the dial is assembled with the transparent cover in position. CASE A strong case of quite good appearance is made by assembling the universal chassis members, with the panel covered in self-adhesive wood-grain style material before assembly. f this is done, a washer should be put under each fixing bush nut. Four feet are attached with 6BA bolts, a carrying hle is fitted to the top. nsulated sockets for.. aerial earth are on one side, the earth socket being connected to the metal. The battery should be swiched between stout folded card to insulate it from the boards. Self-tapping screws hold the back in place. Appearance is improved the top is more easily fitted if its end flanges are cut off. off-

77 Now n kit form, we offer mlnute" electronic gnluon make, full n.tructlonl c... O..,_ j :..,... out.tlng lealur vonllon,1.wllchlblllty, automatic alarm. compalablllty. Extension Telephones deat d.,llor fortoye toy. TOo 70p each.ch P.&P, cl. 25p. New X Hatch Generator Hk.2 Mk.l Elsentlal for alignment of colour gun. on all colour T.V, T.V. receivers. Featurina Featuring plus plug n C C' s. amoreienaulvafync.plcjr-up sensitive.ync. plck~up circuit. The case s virtually unbreekabfe deal for the en - :r~:~~:~~~~~yx~n:~rya~eb~~~~e;!, ~o;l~,h: 3"~ Transistors in stock We hold e vary laroe ranoe of fully marked, tested end Quaranleed frsnsretore, power tranal store, dlodaa reel flare at very compalltlve prtcea. Pleaae a tor free CBlaiogua. Our very popular 4p transistors TYPE "A" PNP Silicon «lloy, 'loy, TO-! TO'5 can TYPE TYPE 4 +~~~ "E" ::r,': *B" PNP PNP ~~~ Germanium Silicon, platlfc ~~:~~~~~'l~ AF or encbpeulbllon :~~r ulatlon RF TYPE Slicon encapsulation TYPE "F" "G" NPN ug" NPN SUlcon plastic ancapsulauon alllcon lcon eimllar lmller 27X ZTX 300 renoe 8 RELAYS varloul type. p & p 27p - - +~:~~:::r:o:~~dv8l.rly'~ 1?,1.c,!nt;'.C J>~,!,~ ~~~:'~lo~~~!.~w~ h.:~ :.. lnrlail~~(i"alli.li"w.ucce lully n qu,ntlty 10 world we are proud to offer our Te.ted Guaranteed term Rangel. VCE. Mln 15. HFE Mln 15. -! zt-h 20p tip tip 24p Up lop Rang. 2. VCE. Min. 40. HFE Mln 40 -! S-U zt-t 40 Watt :SOp Zp Zip 110 Watt 35p Z3p Hp High Speed Mlgnellc Counl... 4 digit (non. r t) 24V or 48V 4 x 1 x 1 n Z3p p cl. P 5p. NTEGRATED CRCUTS Wa We stock a targe large range of C'a C' at very com- com petitive 10p are,11 listed Ulted n prices our (from FREE lop each). These ere ell Cslalogje, Catalogue, see lee couoon coupon below. METRCATON CHARTS now avanabl. This fantastically detailed conversion calcula. tor thous. at cla'lltled references between carries b.tw n metric thousmda m.trlc of British claaelrad Brltl.h ( relerancas U.S.A.) meaauremenie measurements are., volume. measure, mea.ure, weights of length, weight. etc. area, velum a, liquid Pockel Size Up Wall Chart tip LOW COST DUEL N LNE.C. SOCKETS T4 14 pin type yp. at 5p Up each e'ch} \ Now new n.w low profile proflle 18 pin type 01 tlp.och typo BOOKS Wa We have b a trga large selection of ot Reference Referenc. Technical Booke Book. n etock. atock. Dptalie Details ara are n our lalolt Catalogu lor the slest coupon Cateloeoe. below. Send N.B. for t TODAY, uilng Bocks Books era ar. void of V.A.T. TERMS OF BUSNESS V.A.T. Prices shown do rot not nclude V.A.T..T. order Pteeea ~:~:~rn~r~d~~ ncluding add 8%to postage. lolal value ~o:r~:~.v~~u~.a~ No V.A.T. of your f.o~~ on overeeaa overseas ordara. orders. POSTAGE Except where staled,.tated, add 1 Sp So for lor postage &. Over 8e8s-add aeas add & packing 1.,.. any n U.K. dlfleranca Overdifference being charged or refunded. PAYMENT with ord.r, money Cash order. wllh Minimum order, Cheque value Mp or value-50p You canafeopay also by ACCESS. MPORTANT E/ery MPORTANT-Efery effort efforlls s made fo 10 ansurs ensure accuracy descrlplion at lime preparing of fh/s prices this adverf/semenf end dtscripuan adverllsement going si lo Urn* to press. of Prices ere are sutjeci subjecllo lo ahertvon alteration witttcul wllhoul nor/ce- nollce. PAK Bargains in Semiconductors, Components Modules Equipment Electronic Transistor gnition 6 00 Now n kti iofm, we ofter lhl«"uo-!o-1hom nut»" rrtehe. lull electronic netrucllone tynlllon supplied syatem. with Simple thee* to outstendlng imturei. Trenalstor end eonventlonaf end automatic swllchabilrty, alarm, nspetlve burgfnr prool end poeltlve ocv-up compbtnbllrty. Enantlal lor atlsnment atcotour ouni on ell glnaer'e tool bav only maaauree 3*'x8i"*3', R.,dy unit bu 9 95 c com P 'TR w, kit. 7 7'j5 95 only (nclgdei p. 4 p.but no battarlee) T-. Ml UHF TV Tuner Units Br new by a famous manufacturer fl 1 R n Data supplied 3U B.P.P. CATALOGUE 20 pagmi packed with bargains. Sizt 'ij > ty- Send large S.A.E. with 6p rfomp. m Pfeaae Pi... etafa al. NPN or PNP on order. ord.r. High Spaed Mspnetlc Counters 4 digit (nonreset} 24V or 48V 4x1x1 n J3p p & p 8p. NTEGRATED CRCUTS below. METRC ATtON CHARTS now aval lab le, 7hl» fantastically deietled converelon calcula- Pocket S la 12p Wall Chart lip * LOW COST DUEL N LNE.C. SOCKETS 10 pin tyoe at t7p each / type BOOKS V.A.T. Stnd for this of pubucauont B-PRE-RAK LTD CO l NoS?iT"n3 Our famous P Pak Full is of Short still Lead leadinq SemfconCtctoreA in value Componanta, approz. 17D. We guarantee ELectronlc at least 30 really high quality factory marked Trenslalota PNP 4 NPN, a host ot Dlodet & Rectlflera mounted on Printed Circuit Panela. dentification nformation on Chart the Tranalitors. supplied to give some Pak P.. 50p SPECAL BPP PAKS - Tested" Guaranteed M.r... '." tn4007 N4007 SM Rec. diodes. diode ,000 PiV PV amp.plaiflc pluuc all at SOp each Bi."t 6 A 4 Bt B Reed R d BwttchM. Switch, 1* " forb long t" dfa. dla. Hlflhiptad Hlghspe.d P.O, H H35100» type Mixed Mlx.d Diodes, Diad, Germ. G.rm. Go'd Gold bonded, ale..c. Marked grd Unmarked Unmark.d HH tm 30 Short lead Transistors, Tran..lo", NPN Silicon Planartypat typol H3. 6 ~::~r:1:d nkepratod circuits clrcullo 4 yatcs gal BMC 962, 1N12, 2 flip flops flop. BMC 943 H41 H4 2 BDt3i;8D132 B0131/B0132 Complementary Complem.ntary Plastic Pla.Uc Translators Tron.lslorl H65 HS ^ <0351 Typ "n.lstor. camp. 10H58 OKS6 Type NPN S. tranatetors TO-5 can comp.- HM HH ^ Typ tron.lotor. TO S can camp. 10 to h56 Type PNP Sll. rensletotb TO-S con comp. Has Special Bargain Paks. (unmarked, untested) ~, all at 50p SOp each ~ 81 Bt 5fl 50 Gsrmsrju-r. Germanium T Transistor. ran.(.(or. PNP, AF.nd RF BM BH Germanium Diodes Min. 150 Gef^8r,,ul11 DJO0M Mir. glass type B13200 B3 TAff LW Transistors. Translators, manufeclurors' manufacturers' rbjecle, rejects, AF.RF, AFt,RF, Sll Germ. BM B4 inn 100 silicon Silicon Diode gla qulv. OA200, OA2C-2 Diodes DO-7 class eculv. to OA2D0, OA202 BH B6 J 100 QO SU. Sit. Dlodaa sub. min. N 914 end N916type» tn916»«6 H2O -in 20 BYt25;7 BY28/7 R.ctlflers pla.llc. Mlx.dvolla Mixed volls Type Silicon Rectifiers 1 amp. plastic. HU HU E 15 Power TrBrslators. Transistor., P.NP. PNP, Germ. NPN Silicon ** TO-3 TOol Can Can H67 Q 3819N Channel FET'a FET'. plastic plullc case cas. type.. H7 10 Sterling Sound Audio Modules A new developmenf by B-PRE-PAK for en- A new development by B-PRE-PAK for en thuslasts thusiasts who like building at keen prices. SEE OUR SPECAL AD. PAGE 954 SEE OUR SPECAL AD. PAGE Hi A rev. counter for your car The "tacho Block" enable* you to turn any c.l The "Tacho Block" enables you to turn any 0.1 nto ('ounter. The ma 1 00 block meter la frlo s encaosufated an accurate encapsulated linear eaaliy rev. easily fitted courfar. nto»* t%t% t *0v any car with conventional coli gnition. Each any car with convantional coll gnition. Each To Bi-PRE-PAK Essex 222 West Rd., WeilcHfl-or-Sea, envelope wllh flp elamp.) To B-PRE PAK 222 W.st Rd., W tcllll on-se., Esex Please send laiesl latelt B.P.P.Catalogue. C~talogue. (5 ( enclose large S.A.E. envelope with 8p tamp.) Pleaee send Enclosed nc. V.A.T. cheque/money order (Write or mo^a paper f necessary) Enclosed..,....,.. nc. V.A.T. cheque/money order (Write on more paper f necessary) NAME Depl D WEST ROAD, WESTCLFF-ON-SEfl, ESSEX. TELEPHONE: SOUTHEND (0702)

78 944 t Discoun ALL PRCES NCLUDE V.A.T. SPEAKER BARGANS f EM n-«13" x 8" 3, 3. B 8 Of or S 15 ohm fioo GOODMANS 6t" 8 P'.'n Pl«ln '05 OuaFcona SJ" B ohm Dualcone '15 With Wllh Co-AllBl Co-Axial TweolOf Tweeter ElAC 8' 8 ohm Du.lcona ohms only ELAC 0'Sohn Dualcone.. 2'25 ELAC80hm ELACBohm Dualcone Dualconel0watt 10wfltt 1*80 3' 50 Twin Tweeter Twoolor.... V FANS FANE 7" x 4" 4/1 3 or 68 ohm... 11' M Ot Type Typs B or S 15 ohm, ohm. AOASTRA ADASTRA 10" D 8 or 15 ohm. watt watt.. 3'45 &t" M" B ohm, 20 wall 10 wall.. watt 2-? BAKf 10 D l wad 3.«BAKER GROllP 8" 6' ohm. 10 wall >'7S BAKFR 3'75 ohm. GROUP 25 12" 8 or 'Natt.. 7' 12" 8 ohm, ohm. 20 watt w.tt ohm, 25 watt 7-95 &. P. 30 8" * x 6" C/Mag, C/Mag. 5 wall watt " a 8 ohm. C/Msg. ' 15 8" X x 5" Dualcone Dual cone 23" B" s ohm,. C/Mbq. P. AP ' 9 2i" 2t" 08 ohm or M 64 ohm -50 '5. 8 ohm, ohm. 10 wall watt S P. A &. P... *15 TWEETER" EM TWEETER 3^*" 3t" 3 or A 8 ohm CROSSOVER C/Mao C/Mag.. i-jjo,. 20 Doma Dome Tweeter 8 ohm, Cono Cone Tweeter 8 or 15 ohm, ohm. DomBTv/eetgr Crossovers ohm), 10 watt.. '.... 2*40 Crossovera 0 ohm.w watt CN5 (8 CNZ16 (18 Cone Twrwler Tweeter 8 Ohm. ohm, 3 watt Ohrr CN28 (0 ohm). CN23 CN216 (3 ohm). (16 Horh Twgplgr Tweeter B 8 ohm. ohm, 20 wait watt fi-4a Ohm) ','0 ohm).. " &' P P. A.. l:~g -10 KT FORM CABNETS T AK TEAK VENEER 12 X x 12 * x 06 with ff" 8" 0-8" * x 5" 5'"' or 18 x 11 x 9 x 8" 61" lsi" 31" cut out., out x11x0 with 13" * 6" cutout 2-' x 10X0 x 9 wllh with a" 8" or 13" * x 0" for EM 350 4'2S 8 Culout 11 cutout ' P. &. P. ea. 45 MCROPHONES TW209 TW2<X CM70 Planet ellch stick motal. metal, BOO witch wltch crystal CONDENSER t DM160 OM100 Dynamic omnl-dir. unl-dlr MKE 600 ohm. 34 omnl dlr. C... tt. Stick Mlk. with hall ball meia) metal.... j.s Csasette 3 85 on/off switch UD130 UDl30 60K/600 $OK/BOO ohm, ohm. ui>l*tflr Control SUck on/olf Mike cwltch wllh R. unl-dlr ' 5 &. 3'5mm J/Ply) ball ma m. al.. al....,, (2-5 i 3'5mTi J/Rly) 1*45 5"5 P. A &. P. -90 ' 20 SOLDERNG RONS ANTEX CN wall watt.. f-m 1"0 (ow SKf Kit (ibwahcon X25 25 watt (low 2 ~~~a~!t~l~ apara Bib etc.) ~r~,>,r~~ leakage) leakage) " P. 4 &.' P : :~ CARTRDGES CARTROGES & ACOS GP91/2SCorSSC«ier. A STYL SONOTONE 3SC ot.r. comp. AHC/G Dlam. 1'10 comp,,",. 'M '-00 9TAHCor9"AKC/GDam. MO GPB3/1 Ster. 1 to GP93/1 or or 65/1 95/1 gter Star, ceram. Dlam. 110 ter. _ ClYaL.. cryst..... t 1' *35 GOLDRNGG950 G8$O GP«4/ GP94/t or or 96/1 1M5/1 sler. ster. GKO GBOO.. 3-6S 3 ' 15 ceram GBOOE.. GPiO'eryit. "10 GP101 cryst.-comp... comp... O-td GS00E.... fl-m 0 80 &. GP04 P... ' 10 GP104 sler. ster. ceram P. A P. JO t 65 esr BSR X5M or or X5H cryst. como, comp O D. Diamond Sty Stylll t for above.,.. 11' ' X6M SX6M or SXflH SX6H cryal, G6W/G850 cryst. GBOO/G8$O.... M5 1' 15 comp, comp ' 90 GSOOE G800E SC5M SCSM aler. ster. ceram M 2 &0 P. A &. P..,.. *05 ' CALCULATORS. _ Cam Cambridge bridge.. SNCLAR ' Sclenllflc Scl.ntlfic ' 00 BATTERY ELMNATORS 6, 6. 7*6 7'5 or or 89 d.c. d.c. output at at 24)V 240v nput 6. 7' mA 2.5 JOOmA jgvd.c. hpuie. 12v d.e. nput 7-5 (speelfy or9 (specify output) 3CCmA 2>5 300mA t'io P. A &. P. ' S 15 TAPES Slnd. Stnd. LP DP PLASTC 5" 50p.5p l'oop For 5" Reek LBRARY CASES Reels.. tip 51" Up 88p l ' 40p BJ" Si" Heele Reels..,,,,.. 22p 7" Sp 1 '10p l ' Op Reel s.. 25p P. P. 4 7" & P. P. t-3. Reek 1-3, 9d 9p ea. 4 or or more, lot «p 30p lop LOW LOW NOSE NOSE CASSETTES Cassette Up C p p 33D 33p Mp CaBselie 30p Cassette Cleaner Up C»0 Cgo 45p 43 Up p 40p Casielta Cases Head Clesner 0p 35p COp P. -&. C20 P p.a Up 101. C120 SSp 55p 5Jp 52p Mp 50p P. A P. Poat 1-5, Free. 3p ea. 6-10, ibp lot. OfB BB ACCESSORES WHARFEDALE Tape Tap. Edlllno Editing Kit Kit Ref BARGANS SPEAKER ftecordlng Tape P&.P ''"solk'jr 3 TaP Spllc.r f... Ref. Ref.2O 20 -S l t5 Union C P4P lnton (pr).. il-m 11'00 i-oc 1 00 Glak3Kit 2 KU{pr) Glendale (pt).. 33 l-m '» Dovedale 3 Kit (pr) g 1-» Cassette Tape. editing R C... tt. Salvage Kit R.f. 29 ' Cassette Case Ref. a. 1 ' 50 Stylus Balance Ref. 32A l ' 20 1 Subject to m.nf.elure, increase availability. m Doved.,.3 Kit (pr).. 52' 00 1' 50 Denton 2 Speilker (pr) '00 Unton 2 Sp.aker(pr).. 31 ' Dovedale 3 Speaker leach) '00 2'00 Glendal e 3 Spo.k.r(pr) 57 '" 3' 00 Klngadale 3 Speaker (each) '" 3 00 fl.m, Splrlll.y.t S Spirit Lever. Rel.46 el,-?? A ' Ref. 46 -M" Dovcdale '50 teach) 3 SpeaKac «-M 2-CO H-F Slarao St.reo T.at Te.t Canailo.. ette '10 Glond«la3Swikar(qr) S Groove-Kleon Groove Kleen Record Cleaner! «"10 Klngedale 3 Speaher P. P. A &. P. P. -10 ' 10 (each) f Send 2Sp fo» COMPLETE CATALOGUE, refundatil* Upon flrtj order. ALL ~t~d OUR JU'RloM~~cM.r':-:~~S~~;A~~tL~E'G;;luR':~J'':'~:8~n MERCHANDSE S FULLY GUARANTEED. ftrot ord... Sublect to manfaccurer ncreate «viltab)ltiy. Riversilale Riversdale Electronics Mail Order Department EES G'm PO. p. Box 470, Manchester M60 M 4BU. 4. S.. PE Pi SCORPO Mk 2 ignition system kit new from ELECTRO SPARES *66 OR 12 VOLT *+VE* AND-VEGROUND Here's he new, mproved version of the orlslnal PE Here's the new, improved version of the original PE Scorpio Electronic gnition System with System-with a big plus Over over all the other kits the kits-the PE Scorpio Kit is designed for loriol/i both positive negative ground automotive electrical systems. Nollust+ve Not just+ve ground. Nor Just-ve just-ve ground. But both So f if you change cars, cars. you can be almost certain that you can change over your PE Scorpio Mk. 2 as well. Containing all the components you need, this Electro Spares PE Scorpio Mk. 2 Kit is simply built, using our easy- easy to-follow nstructions. instructions. Each component s is a bred unit by a reputable manufacturer carries the manu- '. faeturer's facturer's guarantee. Ready drilled for fast assembly. Quickly fitted filted to any car. Whan When your PE Scorpio Mk, Mk. 2 is nstalled, installed, you nstantly instantly benefit from all these PE Scorpio Mk. 2 advantages. benefit from all these PE Scorpio Mk. 2 advantages. ' * Easier starling starting from cold * Firing even wllh with wet or olled-up oiled-up plugs * Smoother running at high speed Fuel saving More power from your engine * Longer spark plug life * No mora more contact-breaker burn Electro Spares prices: Deluxe Kit onlyf only inc.vat p&p. p & p. Ready Mads Made Unit inc. VAT p&p. p & p. State 6V or12v system. Send SAE now for details free list. FM VARCAP STEREO TUNER As lealured featured in the May 1973 issue of "Praclicsl 'Practical Electronics*. Electronics'. Superb Hi-fi Hi-Fi tuner Kit now available from Electro Spares. ncluding cabinet all components - prc-sel pre-set Mullard modules for R.F..F. circuits. Motorola.C.. Phase Lock Loop Decoder lor for perfect stereo reception. No alignment needed. Guaranteed first time results resulls - or send it back, we'll we'l return it in perfect order (for a nominal hling charge).. Electro EleclrO Spares price only inc. VAT p Bt &. p. 'GEMN'STEREO AMPLFER A superb unit with a guaranteed output of 30 walls watts RMS per channel into 8 ohms. Full power TH D is a mere 0.02%, 0.02%. requency frequency response is 3-3 db from 20 H? Hz to 10OkHjinto 100 khz 8or 8 15 ohms. Electro Spates Spares have already sold 100s 1 OOs 100s 1 OOs of these Kits. Gel Get yours now Depending on your choice of certain components, components. the price can vary from to 60 nc. inc. VAT VATp&'p. p 8i p. ir * All components as specified by original authors, authors. end sold separately if you wish. * Full conslructionel construclional data book with specilicalion specification gtaphs, graphs. fault finding guides, etc- etc. 55p plus 4p postage. jc * Price List only. Please send S.A.E, S.A.E. (preferably 9x4 9 x 4 minimum) for full details. ELlCTRO spares o fhr Cn'ii/iiinrfiil Crnin ol f/ic /Vrwf/ 1 2B8 CClESAlLfiD-.SHEFFELD S11 8PE(C) 03 TeltSheffield

79 L.F. AND MARNE RECEVER-continued from page 942 UlllE No. 8 presented last month i*,-' it a «i m V' lw BEfflaDHOl HQBB Q Dl T, Q HBHaiBDEElBl iaibr>.. n 11 B 0_j m a n BQim m BBBBB) m ^HlEDBl 0 B ixnobu, H 7i BBl u iabllhlb 0 MSBMB B B B S B B HS jjllehel ibbhbohbb V Ti ihhb ammm T^J'l tv r.wji'.: -fi j.j 1 i... j i' iii- -. i it i * n this view of the Marine receiver the RF/F board is seen with Us its associated colls coils bswtlh. bswi nh. P. W. w. KEMPTON continued KEMPTON-continued from page 926 check everything everyrthing twice you may save yourself hours of stripping down trouble-shooting inter. later. Once you tear the unit unist apart to look for a fault, the finished item will never look quite as neat as when it was first completed. rompleted. NSTALLATON Mounrting Mounting,the unit in the car can be achieved in either of two ways. f a slot is available as part of the car's dashboard d:ashboard layout, the unit may be inserted from the front held by a bracket constructed to meet the earthing bolt at ail: the rear. The bracket is finally tightened to draw dpaw.the machine in securely- securely. Altematively, Alternatively, the unit may be mounted beneath the dash panel or parcel tray using two angle-brackels. angle-brackets. f.this,this method is to be used,-the used,'th,e bolts for the brackets should be fitted prior to assembly of the main unit, since it is impossible to fit them with the deck amplifier panel in position.. Finally, make sure, sure. that thail: the cases c,!ses of the four out- out put -transistors,transistors cannot come into contact with any raetalwork metalwork so short-circuit. short-drcuit. f necessary a strip of insulating material (srbp) may be fixed to the rear of the machine by the earthing bolt. AERAL SYSTEM For best possible results, some attention is neces- neces sary to the aerial-earth aerial earth system. What is used here can also depend on the more important frequencies purpose in view. Quite a number of the stronger transmissions can be received with a short aerial, no earth con- con nection, however,,for weaker more distant signals, an earth will increase signal strength con- con siderably. For maximum range on the 60m 160m b, indeed most other bs, a quite long, outdoor aerial will greatly improve reception. Such an aerial is likely to cause overloading with powerful BBC other broadcasts, results are then better if either a short wire is used, or a small pre-set capacitor is placed in the aerial lead, or the aerial lead is twisted round an insulated wire which in turn runs to the receiver. EM ll') The speakers should be fitted in the car, bearing in mind the required stereo effect. f they can be built into the door panels, good results are obtained but a lot of work is needed. There is also the hazard of a short-circuit developing in the wiring because of the opening closing of the doors. Probably the favourite fiavoul-ite place is the rear window ledge. A satis- s;atisfaotory stereo effect is usually obtained the wiring up presents little difficulty. gjj ll') factory 945

80 BSR H-F AUTOCHftNGFR STEREO mreo BSR H-F AND MONO AUTOCHM... G,. run... ~. R '.... " flan 12". 10" or 7" record. ' 'l'~ ~, ' Auto 1^. Aolo or KinaiS. 10^ of T lladw. A rwordi high (t //>VM ",.. T toilhy,.. Uy unit DD11 btckcd blcked by bj BSP BSR it :..., f\1 *iu*bilify "liabuiy wilb 12 monlb,' '. f«mbte««witb r1w1ld... AC /260*. tn<»dtb»' J \ V ', '... SaS\ J Mi. lluiat _13. x 1Wo. Abo** K lljln. f v* 3 \ Abo.,. motor board 3lin. B«k>v mo»oloi lor boud boird 2/io. 0 Jo. /T*OC ' :::::,w~~/:gi&i~a.atrldge 7 95 Poll 4Sp, Wlti BTEftEO/KOJFO CARTRDGE t/ 73 PO145 PORTABLE PLAYER CABNET *od*nj corar*!. ~:''lt.:::iros:errm;. L»r^«d«Wp. frocl Sho rfiu*. 15" X HcfBd 15" * fu!:;/l~~c'~:e Lid, i" Cbrorao rexin* /^ Cn ^ 4 50 fitunii. 8!tlnC. Motor twird boa.rd cat cut lor for SSR BSa deck. Port Pt'ri dsp, 45p. P»w only n rtd *nd black, cot lor Q irrtrd decv. i rt. onlj' id red black. CDt for Gamrd deck. SOLD MAHOGANY PLNTH Wlib With p.v.c. P.V.C. CoTer. Cover. Cat Cut oot out tor for eioai most 6-50 * J r f\ BXB. B.S.R. or (Hrrard Garrard decki.... T r\ 9 Kl ffiie SUe Si 121 * x 14f 141 x 7 d. 71D. BSR JUNOR A SNGLE PLAYER HB**y duty 4-rpeed, motor witb vb Mptrale pick-dp»rzn Sited LP/Td comptuble LamoTet certrldse. mono ^^.QC ' J Port 25p ^ ALL OUR PRCES NCLUDE V.A.T. Po,45p R.C.S. DSCO DECK SNGLE RECORD PLAYER with auto stop..tereo{modo cartridge. Baaeplate. Bbe lia putc.gli* Pitted»llh anlo lln x 8Hn. atop, BHn. TurnUble. (ereo/mono Turntable. Slie Size 7in carirldkf. 'in dlameier. Baiediameter. A/C Ale mxioi. main 22JJr2BQV 220/260V raoloe motor bat has & a Mpartle separate wiodlog winding 14 volt to power 3 power * speeds a i imall.man play* mplifler. play. all amplifier. sb* size L A. 5 _ 5 _ 0 l Post ~;. ' rocorda. ncords. L. mj \J 25b COMPACT PORTABLE STEREO H-F m Attractin Teak 8niJh Wejghl13lbl. argain Price 25 S5p cafria,,, SPECAL OFFER!, 3 SMTH'S CLOCKWORK 15 AMP TME SWTCH / MNUTES. \^P</ Blurt* lingl. POle two-wa,. Surface mountioa with pel* ttro-way Sarfice Doantlna tlxine Crew. Will replace eruting will,n awltcb flidnr Cfowi. twitch to yif* gin U«bt WUl light lor r*pl«c«for retorn ulitiojr return borne, home. war*, Pfagt. automatio anti-burglar light. VadaMe kllob Tun aotorontlo antl-bortlar lichli etc. Variable briob TufD. oft at lull intermediate letting Polly Fall,. ioiulaled. on or off a( idlnlated. Makers foil or Maken lait interntedlile Jast Jlat list price leluora.!t:50. Br new fodt 1a117 Koaranteed. roaranteed. ^ OUR prjce PRCE poik po.t ^ 25p. CASSETTE RECORDER MOTOR 6 You. Wlll Will replaee replace many RECOaDEE type's BOTOE ONLY. 8 Volttype'. 1'2S. 1,25. deal deallor lor model?. models, BLANK 5 v ila Sp; ALUMTKirB 8 x in 53p; CHASSS. 10 x 7i*i B e5p; i.w.r. 12 x 21 Sin n aidea 85p; BLAX ALJllmJl CHASSS. 18 '.w. 2lin,id" tin 45.: 8 x 6in 53.; 10 x 7D 65.; 12 Sin 85.; U it x 81q 81n Wp; SOp; X.< flln 6iD 90p: 9Op: 12 >: x 3ln 3in SOp; SO.: 16 x Cla loin il, U. ALtntiNnrM ALUJ'UJ BOXES ' Op. X X,,}( 4 X 44n.8Op.9 boxer BOp, 0 x 5 4 x 4}( x 3 4in. l.l2 x a in. mp. 4in.!1.12 >: 4 x 4 x x 4 4 :< 4in.: l 30. ln.il 4in. :0p. 80. ALOKDnDM ALUJ!UM PAELS S.W.'. x 4D 12.; 61n 1G.: 14 k Bin lid Jup; PANELS 2uJ: JO 10 Ho B 7in tool a.w.r. 24p; 12 6 x * 5ln 4in Stn Wp; 12p: 25p; J x Bin ein Sin Sip; flp; 34p; x Oin 61D Blp; 34p; 14 x Oln 8104Op: 40p; 12 x Hn 12in 47p:18 47.; 16 >: x S0tn 0p. loin 8Op. S.R.B.P. PAXOLlf PANEL 10 x Sin 30. SR.B J. PAXOLlN PANEL 10 X Bin 50p. Uiueh DAMETER WAVECHASOE SWTCHES 45?. EA- S p. 2-way, ot 2 p. 6-way. nr 3?. 4-way,. TOGGLE awrrcbes. ip. 20?; dp. 2Sp; dp, dl. 30?. 111DCh DAlETER WAVECHANGE SWTCHES 45 EA.! 2--..,. or 2 p. 6-wa,. or 3 p. 4-way 1 p.l 1 8-way, 2.. wa,. or 4?, p. 2-.way, 2-W.ll,. or 4 p. 8-way, 3-wa" TOGGLE SWTCHES, 2Op; d. 25.; d dl R.C.S. STABLSED POWER PACK KTS R.C,S. STABLSED POWER PACK KTS All parts partj nitrarhotit instructions with Zener Diode. Printed Circuit Briice Bridl!e Rectifiers a.nd Wound Mains Transformer. nput Recllflers Doable Woond Ms-.ds Tramtormer. a.c. Output voltagel 6 or 15 or 200/240V 18 Or or 20V t.c. Ootpal vdllanes available fl or 9 or 12 d.c. d.c. at WOmA 100mA or leis. lell. PLEASE STATE VOLTAGE BEQOiaED.?0,i ~~~~~U~:'~fzoW;WxR~~~ED. Dftails g.a.e. Sna 3j t x 11 n fca. P2"o'; ^C; R.C.S. GENERAL PURPOSE TRANSSTOR PRE AMPLFER PRC-AMPLFER BRTSH MADE deal lor for Mike, Mike. Tape P.U... Guitar, Guitar. etc. Can bo be used wjtb with Battery fi-12*. 9-l2v. or B.T.lQe H.T. line SflO-SOOV V. O.C, D.e. operallon. operation. Sire Si.2:e!"!".r/. R~sponle C.p.l. Kc/l. 26 dh gain. Por U" x li" x ErjpoBJf 25 c.p.r. to 25 KC'i. 25 dfc esiu. Full osewithtalvo ~:rl i:~t~!~~i~:;v:u~~:fea:,s~!~jlq~~rn~.nt iortmctloni tup orlranililoreqolpnibnt. piled. Detail* S.A.E.. fc* /J.TC 1-25 rosi Por:; iqp NEW TUBULAR ELECTHOLVTCS ELECTROLYTlCS CAR CAll TYPES 8/S5flV 21350V Up 14. ' 2W/25V V l4p 14. ; 1 18^X5-18/275*45? 16 'rls ~ 16/275V45' /350V 4/3S0V Up 14. M0;2SV 500j25V 20p M^M/SOOV 50.;. 50/300V 50? bop 8/2507 S350V S. 1000/25V 35, 32~32 '2 50V 20p 18/350V 22p 18? i 1000/ /2 5 V 47p S5p,2v[Jt ^ vrk 32/600V ~:!gs~~ JOp ro~ ' 8-8/4507 ~o.o~!~~~v 22B ~~ /450V 60p 26/25V 2S125V lop 10. 8rlfl/450V 8 ~ V 25p OO r.;.50 BO-r60/350V55B 40 50/350V85, 60/ V 10a !-16/ \' 40p !-32-32/350 :32.; tsp / V 1 D. Op. 52^32/ V 40b 40.,B0OMFB^50V iooomfd350v 76? 95. LOW VOLTAGE KLECTROLYTtCS. ELECTROLYTCS , 44,, , loo, 200n,F 200mF V lop mF 12V 15.: 20.; 50V 3Op. looomf 600 mp 1000mF 127 :2V 12V 20 lip 20.; p ; 25V p 20p ; 35.;! SOV 47p 30?. 47. : ; V 70?, ' mP 2000mF 6V ; p ; 25V 42p 42.; : 50V 67? 57. : 4700/63V 4'OO/63V B5p. 95._ 36O0xnF 2500mF SOV 62.; 3000mF 2SV 4'.; 50V 65. SOQOmF SOOOmF flv 607 6V 25p 82p 25. :; 127 : 30D0niF 12V 42b V 25V 7 76b t7p 'b. ; ; 3SV 30V 35V B5p flip. S5.; : V 95?. 95, V ; ; : 0 4,. CERAMC 001 pf to 0 1pF to 05 O O OlmF. OlmF. 4p p. 0p: Silver 0 25 Mica 12p: 2 to 0 47 SOOOsF, 25p. 5000pF. 4?. 4p _ PAPER 3S0V V-0 7p: 7.: flp; S.; mf 1mF or 2bP 2mF 150V 15p.. MCRO single pole cbangeover MCRO SWTCH SWTCH aub rtne'e sub mtn J»le min 25p. cbaoseoter 20p TWN "0-0" 208.F+l76.F, Slow motion GANG. drive "O-O" 385pF 2O0pF 365pF-i-365pF t365pf + 178pF. wllb with 25pF SSpF. ~ 2 5pF. 50p; 60&PF 500pF.tard ganl: pp twin gang 60p. SHORT ataid WAVE twin SNGLE. Kane lopf, 75p. 10.F. 30?: 120 3D,; 25»F, PF mria 25,F, 65p; can? 55.: 50pF, 60?. 50,F, 55p. 55._ ELAC 90 >: " Sin. 5in. H-F H-Fl SPEAKER. TYFE TYPE SSRH. 59RM. THS FAMOUS AND WDELY AT BARGAN USED UNT PRCE NOW AVALABLE /T.Qi: 10 WATT. B S OS«. OHM.AlE~i~~~lll:J~. CERAMC MAGNET NEON PANEL SDJCAT0RS. NDlCATORS V AC/DC Amber, Amber. 30? 30. RESSTORS, RESSTORS.! w..! w, ~o. 1.; 5. n 10M. HOH mob STABLTY. f W-. i W.. J t w. 1 w.. 2% 20%. 2 ~ 10 vr obraa 2 w. ohml lo 5p. to mes.. tl to CSmeg. 10p. lop. Ditto 5~~, Prelerr~d values ohm. to meg. WRE-WOUND 5%. Prelerred RESSTORSvaluea 10 RESSTORS. 6 obda 5 wait. lo wall, watt. tne*:,. wall, 15 4p. wait. D 10 ohms to look. lop O'S ohm to 8-2 obm. lop. TAPE obms OSCLLATOR in 00K, i0p COL. each; 2w Vilre 05 Val.e lyps. obm JPo, 35p. lo 82 obmr 10?.. FERBTE FERRTE ROD B" S" x f t- 20b; 20.; fl 6 x J" 20pi 20.: 3 * J" :" Cp 10. MANS WANS TRANSFORMERS A~~,P~~~ 250-O-25OV 250-G-250V 80MA. SOMA A SO ma. 86 3'.3 5 r. a. 6 3 *. 11a. or S *. a Q..0-3S0 SO Sa. 6 a.. h Q t. 120 ma. ma * S'3 *. a. T. 4 6 >. 3 r. a. C.T.; la. C.T.: 6 or *. *. 2 a. a CO BLNATURE lature 200 *. v. 20 ma., 86 a.. 3 v. 11. la. 2 x2tx2ia. 21 2! x 21n. 7^7 7S. HDOET ldget t. 45 ma.. 86'3 3 *. v. 2 i.. ZJ 21 vfij x 21 x 2lo. 21n... BOp 90p HEATER 6 3. am., ! am S5. GENERAL TRANS. PURPOSE 6 3 LOW *. 3 VOLTAGE. ampr TaBBrd sop, Ta.ped onlpata 85b onl.oll at 2 amp.., 3, ,18,24 S. 9, 12, 15, 18,24 30 * amp , ,16,lS, , 24, 30.26, 3D, 36, , , U OO M 2 m... 6, 10, 16.1S S. 60 S- OO 8 amp.. imp,. 8. amp., 8. 8,10.12,16.18, 6, 8. 20, 12,18. 12,16. S , , 24, D, 38, 40, , amp.. 8, S, 10, S , 30, , 86, , , '7S 76 a. 3.5,8,10, 130r5-0-5 v SOp. 5. a, 10, 13 or *- 6 amp. 1 $ v. 500 ma 90p. v. v. 300?5p. v. 500 ma 85p. 9 8Sp. 12*. *. 1 12v. 750mA amp 95?.?SOmA 95p *. t. 3M 48v. 2amp. ma lapped 76p. 12 tapped 12*. * v. or 86*. na 36v V 38 amp V 3 a. K'SO. 2' V OKU 022U 4 a. 3. AUTO 115. t w. TRANSFORMERS. 116*to 230* or 230* to 115* '00; 27-50; 215'00; 1000w. 18'00. CHARGER 4 DO; TRAKSPOBMEBS. 500w. 7-60: 750w. TRANSFORMERS. lopnt 16-06: n,ul 00.'?50*. OCOW /250 lor S 6 or 12*.. 12v., 1\ t amp. 1-60;.u 50; 2 amp. 1 1'80 80; : 4 amp. 3 Ready with lead. cups ll BATTERY amp. C2 CHARGERS. 2 ; 4 amp. 4:6 Reidy 6 amp. built 4>60. wllb leidi clip? l4 50. _ FULL WAVE BRDGE CHARGER RECTFERS; : 86 or Of 12*. 12v. outpnlt. outputs. 11 amp. 40b; top; 2 amp. 55p; 4 amp. 65?. 851'. MANS SOLATNG TRANSFORMER Primary Primar, * Becpadtry Secondary 0-240* amp*..m 720 watt*.. nsulated termmab. Vunilh impre(nated. Fully eoctoaed nauuled la iteel caie lermipal*. wluj flvinr VaraJih feel, itnpte^nated. f *} Catr. Folly Famon* ~~~~':: :a:~~~:::: ti~~ o~irci 12 C:5~' Suitable make. lornatilde (Value for ontslde tua. 19) OUR PRCE * 1^ 05 p nle. SET OF 3 MOTORS FOR COLLARO STUDO 115 volt TAPE DECK fl 1 50 Post 50p. SOp. VOLUME CONTROLS 180 «" Ohm Coax Sn 5 ri. d. S 5 K. obmi ohm. to 2 llee. Meg. LOG or BRTSH BRmSH AERTAUTR AERALlTE LN. L/S LS 20?.. D.P. 35p. AEHAX1AL-AR AERAXAL-AR SPACED SPAC;;:D STEREO LS Jd. 2; 60 Jd. 3. EdyefiK.S.P.TremLjlor L/S 55p. D.P. 76p. 25p FRNGE ** LOW rl. Edge5K. S.P. TranllBtor 2S. =:r5 ~~,r..'~:'o. LOSS i3. in. per deal 625 colour. ^ yd ~' Wbewoond Wirewoond controll 1Hn. dlam. wau ohm. look Britiib British made confrola with on?!in. long ipmdjee diam. spindlel Jin. 3 watlr,!in. dia dla BOp 10 80p et. obre* to 1O0K ea. DUAL 500k 500k LN D.P. swlteb. witch.lnner nner CONCENTRC ipladk pindle 3jia; POT 600k LOG + 800k LDT D.P, 3!in; outer iplndle spindle 2ila. 2!in. 75p. E.M.1. 13t X 8 in. SPEAKER SALE"! SALE! ^1,1 With :f~~ And efotsorst. twin hveekrs. ~:~:Bo~~~teiso 10 f a r n watt State 3 or Of S 8 or 15 obm. ohm. As A Ulostniled. illustrated. Pest With Ssrrd flared iwr«!«r tweeter coca cone a~d mapiaet. 10 watt. ^^."Tr B?»rei.45-6Q:??. ::Jg,n~~.14~~t!Ps. LZ/D 2-75 Flm: 10,000 gauss. State finz or 6 Baaii. 8 of or 15ob=. ohm. Pert Pod 25? 25p "" j Bookshelf Cabinet~ u.ig.ju,, 6-40 Fluted Fb!ed watrd wood franr front Tnk Veneer Poit 4Sy E.M.. 65rn. 6!in. H-F WOOFER ibb. 8 S ohm. ohm, 10 watt. Larya Large ceramic mifttt malplel Special ~~~~n~;b~:p::~e Frequency Rubber rcsponee cone iur70>aud ,003 3rn~OO~ * 4 a Cpl. cpr. deal P.A. Columus. Columns. Hi-Fi Ri-Fi Enclcsore Enclo.ure Syitemr, SJStemJ, etc. Suitable'cabinet Suitable cabinet 12 x 8 ; vw t Suitable Tweeter ELAC COKE CONE TWEETER The Tic maficc moving cnll coil diaphragm five* cins a good radiation radjatios palters pattern to the tbe bkher higher raqcesctes frequenciel a.mooth extension 01 relpon.. fom s from 1,003 smooth cpa exteciion cp. to ol 18,000 cpi. total Si*e respcun Size 81 8~ '., 3* 31 x 2iu. 2in. deep. Ralluj; Rating watt, watt. 3 obm. ohm. ~~~~;:r GOODMANS ~i~.~~~~~ 8 ohm 12 watt. Deep cone. Heavy ceramic magnet. BU resonance 35 cps. Frequency response cp. ltt~i b.~~e~lor ~~!:P'cC.~.~.:,.:y~'- '" LOUDSPEAKERS P.M. 3 OHMS. 7;.: 4in. 1,25; llin. 1-&0; S " 51n.!l-60: Sin. 1"5; 10 x 61n : loin SPECAL LOUDSPEAKERS! New. 3?bm, ohm. Ziic; OFFER 2Un; Zlin; SUn; Slln; LOUDSPEAKERS'. aun; 6:n. Sin. 8 ohm. ohm, Plin; All 2Un; ZHrt; Br 2!in; 6iu 5in x Kaw. Sin: Sin; 5in. Sin. 15 S obm. ohm. Siia; 3!in; 5!n; 5tD; 66x4in; 4in: Sia-rSia: Sio x 3in: Tx4in; 7x4in; Sxfilc. 8x5ln. 25 ohm, 2Un; 3in: 3in: 5 'x 3in; Sin. 35 ohm; 8tn: 5in obm, ohm, ohm, 2jla: 2«Ja: 211n; Z]iu. 3ln;!iD ia: chm. 5 :i ohm, Sin. 3in: 5?n. 35 chm: 3in. 81d: 6la. EACB EACH.. LOUDSPEAKER... tt with ln lin lout long threaded VOLUME fcuah hush tor CONTROL lor wood pane! 15 pan'!l mounting ohm 10 wati «?. 651'. RCHARD ALLAN TWN COSE CONE LOUDSPEAKERS. 8tn- ad diameter djameter 4W , 50. ffin. loin. dnmcler diameter 5W 12 2,95: 65: Poll Po.t 26-11, Sic. Uin. diameter. 6W. 3-50; 15 SPEAKER djamfltr. COVERNG 5W. 3 50: MATERALS, 3 or 8 or 16 MATERALS. Sample. ohm modeli. Sam,le. Urge La.. e 8.A. S.A.E. Horn Tweeten Tweetetl 2-16Kc.'r. 2-l6Kc!l. 10W OW B 8 chm ohm or ohm De Do Lnxe LDS. Horn Tweeten T... lon S Ec/i. Kel 15W. 8 ohm obm U-GO. TWO-WAY ,000 e.p.e.cross.cross OVERS'3, 3. 8 S or 26ohmll 15 ohmu ia. Z5. 3-WAY CRCSSOVXR CROSSOVER cpe CPl asd 3000 c?e cp. (25 wait)... 1t) DECCA DOME TWEETER cps. S3 «11U. 8 chm.?fim 3.JQ ls.000 e. 25 watt. S ohm. Price ELECTRO MAGNETC PENDULUM MECHANSM 1 6v 16* d.c. operallan operation over 250 bra. hrs. Coathxaoss continuoul on BP2 SP2 battery, batter,. lolly lully adju.table swing peed. dilp].,.. te.chinl eteciro adlmtable eleetro macuellrm awine magnetism cr or lor for mrtrosoze; ipeed. deal metronome: itroha dlaplaya strobe etc. 05;, taachlag 95p. Port Post 20? 20t R.C.S. VALVE AMPLFER 2 Stat(e Pentode valve. watts outpnt. Volume on/cl! Sla«e onlot! tad Triode (ono Peatode tone controli talve. controls AC 3 mains. watta 3 Complete ohm cutput. Voloma tertad. te.ted. With Witn Laadagetker. Loudtpeaker Part Po,l 25? ia,. WEYRAO WEYRAD COLS PSOPAC-fOp. P5011AC-60p. 85. Gang 1,10. P5C,'2CC-4Cc. 1 P5012CC-40.. opt: RA2W OPT1 e5p. SSp Twin Priated Osuf PrDlod Circuit M0. Clrcuil 95p. 85,. P50/5CC-4Cp. P5013CC-40.. LFOT4. LFDT4. 85?. ~ COAXAL PLUG 10?. lop. PANEL SOCKETS 10?. lop. LNE LNi 18p 18, CUTLET OUTLET MOUBTlfG BALANCED BOXES. SURFACE MOUNTDtO 25?. TWll' ohm>, 74. 1AGK lack SOCKET TWN Bed- RBBON Std. opcu-ctreclt FEEDER open...:ircnlt i4p, lb, cjaie-d 300 ohm*. closed clroclt 7p cirouit 2»p; ft. Zp; Chrome SOcket Pbono Plugs 5p. Phono Sooket 5» JACK lack PLUGS Lead Socket Std. Chrome 45p. Phono 2 p: Plnxe 20.; 33 S= 8a 6p. a Chrome Pboaa Socket 12?. 1Bp. DN Sr DB SOCKETS Ch i, 8-.ln lop; 5-.1n DB SOCKETS Lead Cbatci 3-p:a Cp; 6-pl= 10?. DN 6CCKB7B Lo.d 8-pln ls.; S-pD Dll 3-.D ls.: S-pin 25,. VALVS 3-pln VALVE HOLDERS 18f: 6-pla Sp; 15p. S.; CESAMJS DN PLUGS CERAlC Qp; 3-pin lop: CANS 28p; Sp. 6-plo 25?. 5,. FM/VHF AERAL FEEDER CABLE 300 ohm auitable suitable lot for atereo.tereo 7p per yard. BRTSH FM/VHF TUNNG HEART to Mc/» Kc/l Britlah BrUih made, made. 2 Trao- TunailtOrs ready aligned require! &lignn-requirel 10.7 Oor Our Priw Price irton Mc/a 14cll F. with tnning gang. ~3-95 CoDCK'.lon? TP. Complete wich toninc can?. O 7 nc ConnectioDs sapplied but some Q;, technical ezperleuce «Dp?lled e:rperience ttuuired. bn* ipme required. oww SUTABLE.F. STRP Port Po.t ZOp, 2Op. ALL PRCES NCLUDE VAT MNMUM POST AND PACKNG 20p. CALLERS WELCOME RADO COMPONENT llustrated Eft-ochure, Ra~io Books & Component Lists lop. 8 in.woofer A -JM'* ohm 12 wall. Deep cane. Sir Heavy ceramic magzet. Bin v *fy reloukuce 35 cpi. Prequescy ' refjooao dtsl fcasa unit lor cps. x H(-F iy?!emi / J ^ LOUDSPEAKERS 8 x Jin, 1 60; Sic. PJ! ; OHMS, 10 7x x ein. 4En. X 125: 90; KHn. 8}iQ, l 13 50; M- ALU PRCES NCLUDE VAT HNHUK POST AND PACKNG 20p. CALtERS WELCOME llustrated B'rccHure, Radio Books L Component Lilts lop. Written guarantee. Written "uarantee.

81 ALL OUR PRCES NCLUDE V.A.T. EJ\/1 WOOFER AND E.M... V., TWEETER KT THE THE PAR. PAR. Po.1 Pflit 45p. 4Sp. BAKER MAJOR 12" is-o BAKER H-F SPEAKERS HGH QUALTY - BRTSH MADE laviqablft KpArttrly- S.7 5*75 5 ~:~~ble!4'25:zep';:i::; " ss ,500 cone, wooler e/r 12intweeter double cone REGENT &1 90). OomprWng OosiprUlnff «fine line ezample euopta of ot a & Woofer Woolar locelber with a BAKES lot 10J )( x BUn. fllln. with wilb a massive aimifte Ceramic Certmlc ceramic 12in. &rdel. lucoet- 44.,.. 4iox, G... 13, ", lines. bitlnit a roojnet flnx deiullr afiemblp o! 15 watts Aluminium Alomloiata Cone Cone cenlre ceolre to to jmpron mprore 14,000 pi'ju a totel flux An inexpensive inezpenslse unit for to; the elddle topnipoase. DfdlD. top re.ponae. Alio (be Also the E.M.1. E.M.l. ol 145,000 Maxwelli. Bin bekinner beginner in n high hl;h fidelify fldeliiy ',,"ttr Tweeler 8Un. 311n. 'Q.uare jutr* b81 fasa a special epoclti irionasco 4C c?s Piled 20 for general purposes. May Msy b. bs! \1 Uchtw.ight Uahlwelrfal paper paper cone com magnet majroet flux flu* watts. NOTE: 3 or 8 or used to lo improve i=erase an, any Radio. Eadio. * 10,000 i 0,000 Une foes- CrollOVfll CfOMOTer condenler condenser nd 15 obins must be slated. AmpUfler. Hi Fi Television 'alllnltrnctlon. (ou nttmctloni 'Dpplied. aapjlfsd, receiver. receieer. AmpliSer, Hi-Fi or Telerislon c - "? T - i mpedance mpedance Stard Stard 8 B ohms oferaj tfodnle kit, c^a BalS Bass Resonance 45cp 45cpi y' ":dmnm Kadmnm power power watts watla with tweeter, eroisover. biffia Flux Flo* Den.ity gau re.ponse 45~13.DOOcp. Ullra! UtelolBesponie RespoD' to to 18,000 18,000 aps cp> nsuucliom. 10,95 Useful Density respeme D?:sp» Z.KOeaus. flau... RelOBanCe ReionancD cps cp* 3 or S 8 or 15 obm nbm modeb. model*. lltable ittttable ENCLOSURE ENCLOSURE y la 12 * Y. 9in. Bin " Please stft staia lo 35or 8 or 15 ohm!'>. obmv. MODERlf MODES?* DESlOlf. DESQ7, TEAK TEAK WOOD WOOD FNSH. FlRflH. Potl Poi! '5p 75b W' "BG SOUND" A ELAC Sin. or 10 x 6in. 6ln. BAKER SPEAKERS RobulU, Robually constructed to.t st up to c i DE-LUXE Mk 11 # H-F SPEAKER 10DK lone periods period! of ol electronic power. 12in A u.ed leadin:; group. disco. ~~ ~~~~oln. Dual cone Sp~.~!~~~ plasudced roll.urro, rooad. LarRe Larre ceramic eeramlo magnet. msgr.et. Uselul Ulol response 80' ~ cpx. cps. ^ Especially aor- Ax used by leadloc sroapr ditcoi V 2in 15 watts /mjob Especiall, designed to provide full range reproduction 50-16,000 cp.. cpa. Ball Beta leionancc re.onance Bats.. Resonance Eesooanco 55 cps. cos. 'l ful] rauxo deftkud reprcducdan io proeida at an ^4 i economical lor cp.. cpa. 8 ohm impedanco. impedance. use bhtb fidelit, Sin. 8in walu wait GROUP GROUP "25" "25" 7-75 fj.jr d cconomica! ose with any cost. high Suitable fldclily for v f \ 12in. 12ln, 25 watt wall Zw / / 3 M s,stem. syilea. Built-in Bolll-h concentric 3, 3. 8 or 15 obms. ohms. tweeter cone. Bus Ban Resonance Resonsnci adcps SOcpr ' w>w * r TEAK VENEER H-F SPEAKER CABNETS Flux Flu* Density Decshy 14,OOOgau H.COOcauu Uselul relponle c~1 Fluted Wood Fronts GROUP "35" Useful respcrie Bb-lS.OOOcps 'A, 12in. watt $ obms models MODEL MODEl. "A". HA" )( x x 9in. Bin. 3, lein. 8 or Will 15 obois. 8*50 8 or 15 ohms model*. y obml. J-or ~8[n~~'::: lolfl. l&n. speaker, dla. * S 0 50 P,o:; U A *3v rftpoit GROUP "50" MODEL "B". 16 x 10 x Bin. GROUP "50" n. Bin watt 8 or 15 ohms. wall \ SUPERB MODEL MODEL "C". "C". fl 18 > 8 :"C x Bin, y. 61n. :=O~~;h;~ GROUP 50/l2m. / 12in \1\ For ror 8 x :--: din. 61n. /d.ocpoil wait 15 obm..~ 12in. lpea.ker. p*ak«r, l 4.95P~~~ -^ 7J 50 watt 8 or S ohms 36? in. 20 watts blkh quality loudspeaker. Group t T PA Cabinets Cabmet! in n stock A high Quality n-jdspeiker. tock ils remarkable con. LODDBPEAKEE LOUDSPEAKER CABNET Send CABNET for Leaflet. its remarkible low cose» \ Len8.et. WADDTN0 WADDNG Bn. 1Sln. wide. wld 20p 20p U. t. reprodccibn resonance ensures reproduction o! 01 the deepen clear r deepest i.m -. * i.% baas. bals. Fitted with tl special BAKES BAltER RECOMHENDED RECOMMENDED nch nch Efldoiure Enclo.ur. 4 cubic cubic ft. t. MAJOR 100 WATT copper Filled drire Wilb drive eoncenlrie t s cecii: concentric F HT-FX tweeter resulting in m.f CABNET CABNET '50. Carr. Carr. 12 S each. weeter cone muhhc n full 1 fllze e.cb. ALL PURPOSE reproduclion Size x y 0 20 x 2ln. ) Teak Teak Pinlihed Finished Eluled Flated Pronl. range reprodoclion with J. Front. TRANSSTOR reanrkr.hle remarknble efficiencj reltbter. 1TL4KWOOD TEAKWOOD LOUDSPEAKER LOUDSPEAKER FRONT FRONT ORXiS upper register, afflcleccy in the fr: 'w g fi }^ ' GRLLS AMPLFER Bass Resonance 25cp. Modernize Modernile war JOur cnbineta cabinets with with fftl the Orcored Grooved look. look. Shi S Resonaaca 25epr tflkcyw 8 f'l 81z8'- All transis torised. Density 18,5001t8u.1 igr 121" ^ x icr-73p. 10~" -?5p, loi" 101" x 7r-4ap. AQ purpose rinsistoriied. Flux fly le.sofeauss 7:"- 45". deal (or Groups, Dilco Uselul response cp. DPuts speech music. J 8 ohms wodeh. BARGAN 4 CHANNEL 4 npals lor apecoh Groups. Dlico music, 4 P.A, way Useful respense Ccp» 1^^'' -w mixing. Output 8115 ohm..c. Mailll. TRANSSTOR MONO miring, Oalpul 8/15 ohm, a.c. Muni. /j Q 6 or 15 obmi models. VST- '** Separate btln controh. 49 Cart. MUTER. Add musical Separala treble bass ccnlrols. 7 Cscr. Guaranteed bjrbllrhta end eonnd eflecli. ^... Qoerbnteed. Details SAE. 9 S-; to recotdima. Will ml* i " n" lew -- MA10R 39'95. Cm. Mlcropbone, records, tape ^ S W MODEL-MAJOR 50 WATT 3B 65. Carr. 1. end loner with eeparate - -o-l. 4 lopols input! Z-way 2~way nixing. mixing. 2 oulputi outputs i?pafate separate trebjo treble bass coatrole nlc lin^lo autpnt. controls. deal dea! disco SSimt"""* or p.a. amp. n4^ AUDTORUM JShv operated. tolt lattery MOU BTEREO VERSON OP ABOVE 5 D5. DE LUXE 1000 WATT watt 12m. 12in. 25 watts gsmk VALVE AMPLFER CHASSS a A '-11 lull run range nmtonc reproducer far f ia 101 BARGAN PM TDSER. 4 input 10 wide lange tanlte eonlrola. control. Mikes. Discos. DiACOS. Orxsm OrKau hlr.h power, Electric Guitars, 68-1 OS Ma/J Six Trauristor. i^bgmnk^h Guitars, Gaitars, etc, etc. 4, 4. 8 & "M ohm Ohm cablrali. mrisputen locdspetkeca For SWcn loudspeakers matching malchlnc lmjcot. matcbinj: OrMn' hlch 69,00. public «K,r, tdirtrr. Einirle address, nulli-in-abn Ooiut,. multi speakl1' Bv, fe ' al V"" fv * W 9 ioil. Printed ctreoit, s s,stems. electrio Calibnted eltde dill luninr. *<*.' " x, 1 eyslems. electric organs. <91 ' K "NSTANT" BULK deal lor Hi-Fi Di.co~ Wtlnul Cabinet. X., THE "SaTANT" EDLB TAPS DEMAGNETSER. theques. fiiie 7 >: b x din.^bstf wgvzawm^i ERASER & HEAD ' BDLK DEBAONET1SER. TAPE dbt"",!l, ",,l>r Hi - r ' ' n< Oij»- i25 SiJ t- Sol Suitable cassettes, lizel 01 Ban Resonanct 35cp. mains 200/2!iOV. Flux Densily S.000gU HAHQA1N FM TDHEB. / A Use(ul rejponsfl cO As above less cebfnet, * * u tape table reels. for A.C. casiettes, meius :l««, D DEHAOKETSER. all sizes tum. --.:... f 2 : y 200/250V. LuB.t e.a.e. Dalai.od tube S.A.E. 800J250V..11 re, of ^ BAROA1W 5 WATT AMPLFTBR. 4 Trenriitor S Jg, r8;' ^ af F u» Wpiij R'ron.nc. S.OOOnui. 3S::i f j J K Jg fj Aj-/m> t TC Foil gflp - -jg# ' : * F Dsetnl 8 or 15 respocss ob r ohml modeii. Jb-lfl.OCQepi modell. -a, 3E y m - Pmh-Pnll bsu eootroli. Read? 18 volt built battery with Tolnme. operated. treble t Po. J' j Cf W QUALTY LOUDSPEAKER ENCLOSURE W Teak veneered thick wood cabinet. Size Bila teneerefl 18UD - y lailn Jin 1811n x Sfiu. lilck SUn. TVeiqhl wool cawnet- Weight 83bs. 231bl. This She flmh fh~~er HEATNG ELEMENTS cablnel cabinet features muh Silver Grill a tor mount~ OTERHO AUDTORUM Ol'FERlNG 1M USES USES for lor erery e.ery type ype ol 01 betting he. Un. covering febloreb a separate a compartment wide mesh Silser for mount- GrilJ ^?pb HUL/ A FiMT^tD J U l\ U 11 fn Ll AB. nd drylnc ink or Mid-Range The lun, 4tJiDR' apphceuout appllcauonl in in tbe the home, home, rarazc, «atage. ireenhouu, inc Tweeters or Mlfl.Renfo Horn. Tha lolly JjjWH jfljs. greab.hou'. faclory lealed compartment is cut out tor tactoff (atauaue (,nuabl, la n manulaclaritu: manufacturing qtunuhes]. Quantities). Appror. sealed bass eoaiparlnent it cut ont for C Approx. 15in. 3S watts»m 6Uoch Sp 50 ze x BJ St x x ft hin. in. Operating Operating roluge voltage 2M/250V. 200/250V a.c. flilacb Woofer Carr. 85p. UU. n WSCtS A \ c Carr. 85p. BatHe be to A hirh wattage loudspeaker 260 watil watt. appro*. approx. Printed Printed drcuh circuit element element encloaed enotond q Jq sabeitoz 01 exceptional quality with a belto' fllted fitted wilb with connectfnjr connecting wlrei. wires. Completely CompleteiJ flcrifcis take Rosewood larger Version speaker Carr, S5p, Baffle could be cut to cl a exceptlooal bieb wattaxe quahly loud'-raker with a Cv» flexible proiidlng relponse to above coplere pto'ftdlnc sale we BJack Black heat. heat. Brtlub-mtda Britiab-made Jor lot use use in in phoio- level respouir io ahov* L.'^L & pbotocopien print print drylnr dryink equipment, oq.ujpmont. ' SPECfAL SPECAL OFFER OFFER FFEP. B.MO 8,000 cps. cp.. deal for tor Pablic PubJic EHV deal Rheostat 2ilo.., Dilcotbeqael, Electronic instrument. th. d l for fot home home baudymea hymen erperfmentera. experimenteu. Suitable 100 Ohm 20 watt RbeoaUt lor Suitable Sorew Un. diam. 95p. Moil lot HeaUox Heatiog Pads, Pau, Food Pood Warraers, Warme", Conveetor Contactor Eeaters, Helllen. elo. Screw Terminals Jin-. diem, spladlo. Pcsl etc. AC 3 cham;e home H.F. lul be be clamped clamped between between two two sheets.bee" ol of metal metal or or aibeslcs, AC mains relay 3 Jin. Rbeo>Ut 2Hn dlam. Ceramic Former. Address, D:scoLbeqaes. Elec- K ) diara. spindle. 65p. Post 25p. ronic ibbtrumeuls (hs R etc., buto., 35cp tie., to to make make efficient emeteot clolbea clothes dryera. towel dt)'tfl. towel raos ideal rau.- idealfor for Bass pole change over 75p. borne Resonance H-Pi. 35spi BjJH * \ J ^2 m airier Flux Density gau alrinr cnpbotrdi- cdpboard deal deallo! for antl-froil anti lroat deeico dnjce for for the the «ar»*e Karalte preventlots Useful responle 20~14.000cP -prelentlnk froxen frozen radlatatt radiators or aclln* adinlt is a. oil oulump sump heater, JTTV REVERSBLE RSBLE 4 POLE MOTOR ^ beater. use Ule in tn the the ffteenhouw greenhouae tor lor seed seed raliior rawng plant plant protection, "i-rj'a protection. \1". ' 1, r.p.m. r.p.m. Re.ersibla 42 Walt. Wall or 15 lavaloable lantaable aid.d tor lor bird bird faoueet, hou.t. inoolators, incubators. etc., etc. etc. etc. Cau Can 5 spindle P.p.tt. 11' 11" y Reversible x -/j,". ': 132". slxe lize 31" 42 Waif. >: y. g--. /T TP 8 <«i5 ohms models. / 3". be be used DAd n in aeries aeriel for for lower lower beet. beat. Or Or la in parallel parauellor Jor higher As higher As illostraled. illustrated, 240*. 2409'. mains. main.. 35? heat beat applications. itrafed. ir * 24Qv. AC ahe maiot. ar k r, Post 35p T* r "T / qm r%f\ appltcalion E.M.L E.M.1. TAPE MOTOR loto ONLY 40p EACH (FOUR FOR FOR 1-50)1 4 pole. 840 v. 235 Size ^ 21 * 2'in. /1 1 50) M~;j,!~~pi~ll~5hinAcil:::t;;. ' 2:, or 2290 rpm. Spludlo ft 1 ma. in dismaier, ditmaier, She 3i " 2' >: Siio. J /l.oc t J "OD " ALL ALL POaT POST PAD Dlrcouals PAD- Dbeou.l. lor lor ouaoiity. Ri "?l ^''clojure * Manui! containing plans, feslpna. 1 crossquntil,. Fost Post aop, 30p. over daia ami cubic tables. 80p. Pcsl Sp, CUSTOMERS FREE CAR PARK OPEN 9.5. WEDNESDAY 9-1, SATURDAY 9.5. CloseU for funch M CUSTOMERS FREE CAR PARK SPECALSTS OPEN 9-6. WEDNESDAY 9-1. SATURDAY 9-5. Closed for lunch )0 337 WHTEHORSE ROAD CROYDON SPECALSTS 337 WHTEH0RSE ROAD. CR0YD0N (Exporti (E"port. Atmic Remit catb ca.h snj extrc extra poiiaib.} po.tap.) Bur,, BD,,> Bu.e. 50, so. «g. «!, 68. i9-roil (59. '59. Hwl Rai' S,/har,t S./hur. Se'hurst Telephone

82 <'. J " MADE T MYSELF" magine the thrill you'll feel! magine how impressed \ people will be when they're hearing (/ programme 011 a : modern radio you made yourself. Now! Learn the secreu secrets of radio electronics by building your. own modern modem transistor radio! Practical lessons teach you sooner than you would dream possible. What a wonderful way to learn learn- pave the way to a new, bctlcr-paid better-paid career! No dreary plougiiirg ploughip.g through page after page of dull facts figures. With this ftiscinaling,'ascinating Tcchnalron Tcchnatron Course, you learn by budding building! You build n modem Transistor You bu"itd a modern Transistor Radio... a Burfdar Burglar Alarm. You learn Radio 2-lccfronics Electronics by doing actual projects you you enjoy making enjoy-making things [~s with your own hs thai that you'll YOU'n be proud prouu to own! No wonder \\londer it's it"s so fast easy to learn this way. Because learninv lcarnin"g becomes a hobby! And whar what a profitable hobby. Because opponunities opportunities in the Held field of Radio am':' Electronics Elcctronil:s arc rrowfng ntowing faster than they can llnd find people lo to fill till the jobs! No sofdenng yet soldering-yet you learn faster than you ever dreamed possible. Vcs! Ycs! T-'aster Faslcr than you carl can imagine, you Pick pick up the technical know how you need. Specially prepared slcp- stepby~sh!p lessons show you how lo: 10: bv'slcp read circuits assemble circuits-assemble components componcnt~ ^build -build things experiment. things-experiment. You enjoy cnjoy every cvery minute of ii! it! You pet get evcryihinp c\,crythinl! you ~'O U need. necd. Tools. Components, Componcnts. Even E"'cn a versauc v('rsa tilc Multimeier Muitimclcr thai that wc we icach cad) you how lo to use. All included in the course. AT, NO EXTRA CtrAROl:,' CHARGE' And (his th ls~ is a course anyone can ~ajl nltord. aftord. (You can even pay for h)r it by hy easy C3 ::iy instalmenls). nstalments). So fast, so easy, So fast, so easy, this per»onalised personalised course will teach you even f if you don't know a thing today! No mailer maller how little littlc you know now. no mailer mattl!r what your background or cducaiion. education. we'll leach teach you. Step by step, step. in simple casy-uvundcrsi easy-l0~underst Jancuagc. language. you pick up the sccrcis secrets of radio anc, an(~ electronics. clectronics. You become a nan man who makes ihings, things, not jusi just another of the millions, millions. who don't underst. And you nave to ~rcat new could career, pave career. to 10 add the to way (0 the lo thrill a great pride you receive re~civc when you Jook look at whjt whitt you u have achieved. achicved. Within weeks wecks you ye- Lt could ~ollld hold n in your h your own O\\'U transistor radio. ruliio. And after the course cour~e you can ~ a n no ~o on lo to acquire highpowered highpowc:rcd tcchnicul tcl'lmicai qualitlcnlions, qualifications, because be~ausc our famous f.lmous courses ~ourse!i ro gc' rirht right up lo to City A & Guilds levels. c\ cls. Send now for FREE 76 page book see book-see how easy if it is read is-read what others say! Find oui out more mor\! now!! This is ihc the gateway 23leway to a thrillinp lhrilling new career, ~arccr. or a ci. wonderful womlcrful huhby hdbby you'll enioy cnioy for years, ~' cars..s*.nd Sl"nd the he coupon ~ounon now. There's 'licrc'* nu obligation. no oblir.llion, POST To: ALDERMA5T0N ALDERMASTON COLLEGE 1^PWQ2 DEPT. CPW 02, TODAY FOR READNG RG7 4PF Yes, 'd d* lo know more about your course. Please send FREE BOOK mp live let*ill plus your bi pts-ps'iu oorik mat tells about all rjur courses. ' HOME OF BRTSH NSTTUTE OF ENGNEERNG TECHN010GY... ""~'.>.;:..';..:o::... A. ~ ALL --..."-- PRACTCAL -..,;.. WKELESS wireuss ^ ~ SLCON! ELECTRONC GNTON SYSTEM This Capacitor-DischargB Capacitor-Discharge Electronic gnition System was described in Practical Wireless, has proved extremely popular. The kit is supplied with a ready-drilled roller-tinned printed- printed circuit board iuiiy fuliy machined die-cast case with AMP Electrical Spade Connector Block together with a custom wound transtormer, transformer. first grade components tull full con- con structional details. The original circuit employed Germanium Power Transistors lor for the negative earth version.. WE OFFER SLCON P.N.P. POWER DEVCES AT NO EXTRA COST! All components are available separatety. separately. Case size 4J' 4t x H 3-J" 3t" * x 2'. 2". Complete assembly construction manual tree free with kit, kit. available separately 25p. SUTABLE FOR 12V SYSTEMS WTH NEG. OR POS. EARTH. PRCE: U.K. ORDERS PLEASE ADD VAT Quantity Discounts: Trade Overseas 1-5 Nelt Nett less 10% Enquiries nvited less 15% less 20% Mail Order Only, Only less 25% 1000 up less 30% PLEASE STATE POS. OR NEG. EARTH WHEN ORDERNG DABAR ELECTRONC PRODUCTS ~ 98 LCHFELD LlCHFELD STREET p.qwalsall, ~WALSALL, Staffs WS U2; ETCHNG 7tb Contains PC Ub ETCH1NC 11b ferric chloride, KT TOO 100 sq. 71b BARGAN PARCELS SQ. HlJn of comp'oncnts-pots, ns ins CDPDor copper clnd clad board, DAtO LlALO atcb Hundreds ol new comtfonents pots, etch resistors, capacitors. switches, + reslal resist pen, Abrasive i\braslve cleaner, dish resislors, caprcliors, Bwllches, 4- with transistors lor for etehlnnjmdjosirlictiofis. etching nst(uctions. > diodes. PC boards Also loads wilh of iransislors odds ends, ends. RESSTORS t & CAPACTORS Contents always changing as new 500 goods come at assld, asstd. reslslors resistors 140, 1'40, 2500 S, ooods 5, aoocoly poly, ceramic, mica cbpacltors capacitors conic in. Amazing value a! 15 different trimmers, air-spaced compression T5 dlfleront tflmmers, ui> Ull to l250pf nir-spaced 1250pF 1. COMPUTER PANELS Always in stock, all sizes VEROfiOARD Shapes thouss shapes prices n prit:es from slock, Sp. nil sizes 5p. 3!bs 31bs VEROBOARD 100 assorted ' 40, 71bs 2' 65, 561bs sq sq ins assorted sizes pilches, nssnrtcd pitches. about Quality 8 b-ls bits high quality 7lbs panels with Mlbs power 1S. 10. tronslslors, transistors. trimpots Pack con ntainin~ raining C's, 1 ahoul rimpois nboul 500 etc compon components at transistors boards SO DL SPECAL OFFER Pack onls inc of hoards nt least with 50 ran 50 sisters 14 pin 95n. DlL QTL DTL C's tc's 1. OF 741C DL OL.C.'s.Co's TRANSFORMERS 6-0-6V <l100m A B5p: All mains a5p; g-o-ov primary V " 100mA 6-Q-6V 90p: 90p; V 100mA V 10 for 2' p; V with J o,'1 1;-A 100mA " } A 2: 95p: 2; v V '1 i»,./ SMmA wllh 9V 500mA 1 tap 1'85; 85; 25 for G. B, B. 9, 9. 10, , , lb V!" 1A la Z 2 ' 45; The lollowlno following are 100 for ei-pquio: ex -('quip: ;,-O - - ~ V "1' la 2;» SA t5a 3 22H>-22yV 50; 18V - lbv. SA 1A 3; 2: S5V 12V 55V -r.,. 5A 5_A 4. 4_.. FERRC CHLORDE CHLORtDE Anhydrous technical t~chnical qua quality lily n in 111) MULTMETERS lib TtMETERS doubl~ sealed fib BOp. 31b LT10l: ,O-1000V , double 1' b scaled 10lb 4-45, packs. 4'45. (OOfh 1Uj ',OOlb 15. aop. 3lb O-MOOmA LTlOt: tOCDV mA DC, 0-i50Kn 0-150Kf! Only AC A DC !l PO AMPLFER AMPLtFER UNT 2500V T12; DC. 20.0CC OC. O-1O-5O-1OO-S0O-1OOOV UV. O-5-M-W-2SO-50O- 0 to V AC, Contained in steel 5,/' x 5 x 3r 0-50J/A -2 '5-250mA, 0-60k-6MQ, -'20 flfe Combined are ZaGETS n tioel 2 x GET116 transisiors case Si transistors on *5 *32" heat 0-SO/'A-?-5-250n»A, tc 0-60k-EM(; a dB, protecled movement sinks, 3 do pot cores, 2 30V zeners, 6 -* Proleriod meter movomeal 4 transfornll'fs, 1 % With audio circuit transformers, 1 R's & C's GiOt. POWER G101. Contains SUPPLES mains transformer, SEMCONDUCTORS 2A cut out bridge AM All new lull full socc spec devices; AC127 Will thermal cut-oul brldqe reel. give V output '2 AC(2B ACt2B AC176 ACt76 AC177 ACt77 AC187 ACtS7 ACiafl AC188 extra pive capacitors V (provided) ouloul with all 20p: OC107. BC bp; lop; 2N P, 38p, G102. (;102. Theso The-se mo are stabllfzed stabilized cower power 723C 75p: 75p; 741C WC 35p: 35p; tn914 ln914 4p: tn4m ln4001 sjpdcs.supplies giving 7{ V '22SmA, idi 6p: N ap; 8p: 1N NtlOO112p; 12p; BOOV ~OOV 1{A HA Volioni' Voitagl: can flivlno be tw altered 7iV ~tncd by chanpirg 225n»A. changing lop; 10p; 400mW zanors zeners lop, 10p; 400V 6A xonnr. zener. Not working, but triac 1 laulls faults 1. Nol»orhino, bul only minor All include postage. enquiries. Computers, prices nclude equlpmenl VAT equipment cnmpononls postaoe. SAE components always list, onqulrios. wanted for cosh, ~ash, GREENWELD ELECTRONCS (PW2) Head olfico, office. mail-order mall-order dept. dept, Wholesale/Retail shop; shop: 51 SHRLEY PARK RD. SOUTHAMPTON, SOUTHAMPTON. SOt 501 *FX. 4FX. Tel Tet (07«) (0703) T7250t, Also callers welcome at 21 Depllord Deptford Broadway Bro;:dway SE0, sea. Tel. T P OS & 38 Lower Add Addiscombo is combo Rd,,., CroydO". Croydon. Tel ,

83 _.. P&f. GetmtfQTS. cmiooot/ mi ammil ncludes doz.ens of useful A & nteresting interesting circuitsyaucan you can build; dala; data; hundreds of of pictures, transistor equivalents list hundreds of new lines. Packed with nfor- nfor mation. Only 3Sp. 35p. rilm4i'l2wj1i*zr/llzattttw.jli4«flw&mkudttlwj SUP RSOmSAM -MY-S RV/C 'M(MOmiTymmm-FASr/ % RESSTORS # TRANSSTORS CARBON CARBO BLK FLK & DODES. 1W tw 1 0 Q ro 1M: M: 6%. U'2 1M2 to loms lom: 10% El2 iw!w 10 Q to loo; On: C%. 5%. r.m-2 1M2 lu to 0M: OM: 20% ]0% AC AC lsp Bp BY BYl p lsp AC128 18p llv12i l3p E12 E1211nto910k:5%El~&E241peach 11 0 to PlOki 6% Rl'i k Kt>4 1p cnch AC170 AC p HY12V Hp AC176 l7p BY164 49p METAL letal OXDE WRE WREWOUD WO ON D ADHl/1025ll> 17p ADHH/162)lP iie\bhscrlc»»yifl4 49? J~~):~H 8erlt's }W iw U> to 1M: lm: 2% 2 % EX'i E12 k '" EU4 E24 4p eacli each 03d 03p 13p l3p 3W *2 n, O O, O O '47 Q: 0: DA DAOO 100 Op 9p MPFlO',' )PF02 36p 17p DA14~ 10% 7p each BAHB 22p OA91 0p 8p in 1 n to 270fh Q: 0% 5% E2 E12 13p cadi each DC107 l Other ranges elockcd. stocked. See Sec our catalogue BA108 JOp DA08 lop OA G71 20p 7p for detail9. DC09 lap 8C46D 88p K12: details. E12: , 12, R, Hi, , ,39,47,06, , 47, 00, DOOOC DCOO DCl09C l&p isp l6p TL843 8C140D T843 g8p 80P UP CS, 68, 82 dewto. dccadelil. DC BCH2 142 E3p 23p WO woo. OG p BC143 26p W04 E24; E24:, 11, 13, ,30,36.43,51,62, , 30, SB, 43, p WO 4 33p )lc147 lop ln914 4, 75, 7:1, 91 anu decades. ECH? 10p 1NB14 4p BC148 lop N4001 &p POTENTOMETERS BC49 J1C148 )lci49 l p XOp JN p i J.N400' Bip Bp 6~p BC68C l2p N4003 Rotary idrdnture miniature carbon ncioec BC69C t!h 121> ln4004 7lp rack»" spindle. sploflle. /gi UClflOC i8p Bp 1N (4004 7ip 7p ~ BC178 ln400!s Values available! : Bk. Ok, 10k. Ok, ~~ BC8"L lop N400tl 8!p 25k. 215k. BOk. 60k, look. look, 250k. 'look. 500k. 500k, ^ 11C182L JC178 17P 1N400S 8p BC183L l2p N ' M, M,2M. 2M, DC183L 2 12d Dp ln"400rt 1N4007 B?P 8p DC184L 121> Log. Blngle-gsng Slngle gang i6p 16p nu?l2l DC1B4L i2p llc212l 14p Up 2 N '2N SOp 4p 20, Lin, Lln, Blngle-gang Single-gang (+ K) lk) lip 18p DC23L BC213L 16p l6p 2NJ303 2N1303 gop 20p Log. or LJn. Lln. 3lnglc-gnng Single gang with JCSHL llc24l l8p 2S1304 2N1304 aflp 30p 8witch sap lcy71 2NJ711 evucb 38p 31CT71 DD131 46p 2N p Log. or Lin. Lln. T>uftl-Ba"e BD13 22p 45p 2NJ7] 2N'i2lO 24p 25p DU'.g,"g~~ DDl32 Mp 2N p without awllch 8witeh. 49p D»132 Rt)13 /BD132 a4p lld131/bdl32 2N2B05 2N204O 2N290~ 33p 4Bp 3Sp Slder 60mm track. Metal N~~2fi Slider BOnrni racv. MP 120 2fC2f>26 Or, cued: cased: overall overalllengtn lenrtn 80-13nini 86' 15rnm BD108 DDl35 30? 36p Vc. Ye, or On 10p lop (knob ctlra extra 7pj 7p) BD30 DD139 Mp 40p 2N3053 2N:l053 18p l8p Log. Lln. Single-gang BD40 69p 2N:iO;lfi 481' k, lk, 5k. or 5k, 10k, Lin. lok, -JSk, BlnRlo-gang ~5k, COk. fiok. WJc look «P75«D140 Sflp 2N p 1\F25P. 85p 2N p 96p asp each npyap 35? DF21S9 ebp 2N3816 Slip 2NO4QB 88? 2NU4159 sip 511' DFX29 30p 7400 l6p Log. Log_ Of or Lin. itual-gang apx2d DUl\l gang ll'x30 3ap 39p lk. k, 5k, :Sk, 10k, Ok,?6k. 25k. COk. 50k. 100K look ^ BFX30 sop 74oo iep llfx p 41ip eftfh BFXR4 30p aap jfmo 89p each BFX8B llfx80 B8p 74n 64p Prcscla! "Presets: OJW, O W Vertical or Wvyj BFXK7 SBp BFX87 30p 74? Bp Mp 451' Horizontal. Horlmntal. DFX BFX p 25p p 93p 100 0,220 O. 2200,4700, K. K.2k2. 2k2. {} f\ DFYaO BFY50 20p p 4k7 10k. Ok. 22k. 22k, 47k. 47k, 100k. look. llftfil BFY51 «2p 20P 22p 74J Mp p 220k. 470k, 470k. 1M M 7p each eaoh BFYB2 DPY52 20p L.E.D. RF-D RED?0p CAPACTORS SmcU 210cd 1"!" Only only Bp Up Sub-minature 9ub-ni!&lalure Pond Panel tip Axial lead electfdyhe electrolytic (Other tothcr mtg. colour# clip coours_n( an<l 7'Rcg. Bp 7 scg. in Mid V Price Prce Mid Mfd V Price displays n our dmfmhe) / 1 83 flp 6p «p Bp..NTEGRA Lfi Bp BP $ 16 Op NTEGRATtD"' 1 8p p Bp 08 6~ 63 Hp ^ CRCUTS Op 8p Md CA~~046 (l4-pln DL} 69p ' p 100 J Bp Jd(d 8p 470 V 8-3 Price 6 3 6p CA3040 (14-pfii DD 09p ftp (T099) Op 6p J00 loo 'JD ~5 8p p LH0042CH 14p MC:nOp (14-pin DL) 2' ' Bp 100 loo 40 BP p MCSOP (14-piii (TO00) DTD lbp MC1496 (UA796) (l4-pin DL) Bp Bp lbp JWp M<.:)490 lua790> (H-pln DL 25p 96p 10 6" BP Bp p BP 680 6RO 6*3 6'3l4p Hp lffc4000n MFCJOOOn 38p Mp 36p BP Bp Bp 16 l6p MFC6040 S3p p Bp HiD GS0 8p 680 B 20 JBp 25p 1FC p NE555V NK553Y 83D (S-pln 66p 15 6~ BP Hp rap 28p SC1495 8C1403 (14-pln (fl-pln (14'pln DL) DD DlL) (1 65? 10 BP ~ l8p 16p Hp S (H-pln (l4-pln DL) tl n'89 fl9 22 :Z p Op 6p p 18p J,LA741C (S-pin DL~ 36p :.! BP Bp 6p 1000 ]0 16 B6P /4A741C 25p J,LA741C fia74lc (8-pJn tl4-pln DD (l4-pln DL) 3Bp 45p Up p 8p Bp 8p p J.'A (14-pln Dl.) n ' p 8p Hp n8p O 1 /ia747ci (H pin DL) 21 05!* Hp J ua748c A (S-piD 39p SO 0p 8p Bp Slip 26p ZN414 (TO8)! Bp 8p p R8p 2N414 (TO (H-pln 18) DL) p 28p Bp Bp p.1 6p REGULATORS flp 8p Bp 8p JJBp 26p 'A7805 ^ VOLTAGE A 7800 ov REODLATOES BV 'M 1-5A (TOlO (TO~) n 75 < Op 330 B 16 Hp» '328p 3 28? 'A7615 UV HA (T03) 1ll ? 63 Bp 8p ap 28p fisp uatblfi Up MVR 15 V DA (T0.1) V, 500mA (TOS) 5V. 12V, 15V. 600mA JJA7~M05 MANS ua7am05 r,v 500mA (Pl8.tic CONNECTORS (plaattc OV OOOniA power) 1*30 la78ml5 15V MOmA P360 3-pln 3-pin 16A l lsa Cheasls Chaasle "Plug wit.h *ilb u ATOM (Plastic 1'SO Line Une Socket. BOp (Plaallc power) V AQOinA fi so 80p J.'.\78L05 100rnA (T092) 80p 8A2190 SAS100 3-pln a-pin BA 6A Chassle Chaa-l Pluc Plug fi2p 22p 'A7RL515,'100mA MA7flL15 ua7«lod 15V DV looina 100mA (T092> (T092)60p {TOS2S 0Od OOP J.'A723C to SAl862LineSockettor 8 A RB2 Line Socket (nr UA723G Variable 2 l<» 37V ~. 4 pin DL) SA2190 RASM 25p ~ - Our (T099 or 14-pln DlL) 75p catalogue contains apulil"a P437 g-pin 8-pln 6A 5A Chan«ls CbaB8is Socket t.ion tlnn cataloffue ClrcUitH clrcuiln conlalns dala 'lala apouca- for all oil with wllh Line Plug 56p 85p t.he the above.c.'a LC.'» many more inore. ORGAN DSCO "! D,SC?V.S^uri;on«""f r!!~tart collcctlng CONSTRUCTON Details.n our tv~uochers NOW L!){!E!8~D~"~,c;oun;~;';' ---ii' A Full Scale Eleclronlc Organ that Full Scale Electronic Organ you can rou Build la Vour Own Bpceincntinn. SWTCHES ;~~LtoC~~S~~~~~~~;;~~' Rotary fljufltable alop.i pnje. FULL CONSTRUCTONAL DETALS 2 ~~~a?t~~:;~:l~~~~~'i to 12 way; pole, 2 to ~~li. ft -H H- N-OUR LEAFLETS _ way: way; 3 pole, 0J e, 2 to to 4 vay: war;,,', ';.JL Leanet!tES ~1: Prlcc UP. 4 pole, pule, 2 or 3 a way 36p r«ch each j T xnftcl Mi;S S: Filer Cp. Slide Sub-mln Sub-lOin J)PDT DPDT 9p lu'srrlhck dcllcrlhcl) a fully fully br>lvi>h<mte(j&^mialamga]3m^ Slide ain, Mill. DVDT DPDT i8p 13p hftslc hasic organ which can lulrr laler Puih Push lo to make JU&ke Kon-lockllig Non-locking t... Umm ns the hljls of n largr J used as t.he hasil:! of n. large 8PQT SPST Hp 14p tmphlftlcmed!-opbis!.icated nalruincnl. s trument. ill PUBh-on, ~~~;n~50~p Pu*h-nff!l~~Oft Locking Lock~8g wf.enoet MES 5 ~ : Prke 5p J DPDT 25OV 4A 48p la-nnet MRS 52: Trice 6p JU Rwrker Rocker While White DP8T DPST 200V 2GOV conlfnuep continues the t he deaeilptlon (leacjiption Of of '**" 10A loa 440p Op Die t.ht> ML'0 MES 50 series!cri el!- otganr organs ami jhowr ~how ~ you rou how Knurr Rotary Malna Mains DPQT DPST 2B0V 250V ~ lo to Mid add a wond second teybrwhl keyboard wllh wit.h ota lots more nlopa. 5top8. 2A Toggle i!.. with ON/OFF plate 80p P~~~ ZJAm /, ' THE AMAZNG DM02 DMOl DFDT DPDT 250V 2MV 1 5:\ SA 25p ^JP ' - A TCA<]y-ho1U. ready bullt. lerfetl t ested arid guaranteed dlgllai digital BeD BCD ODTPDT OUTPUT nimter master om: oscillator. Hint nr. Accurately Accurat.ely generale? gcllernte.!l the top SLDE Mark# ~r~~ SWTCH he ~~~~~ end of the old- ol(} nui«notes lor for }'«ur yuur organ organ *y*tem sy!!tem «ml reduces reducee the he faabloned fashioned thumb-wheel uwllch ijwilch ~ -; complete complete liming tulling of of your your organ organ to to ON'E ONE HMPLE 8UPLE With 7-wginent 7 ijcgment. type t.ype read - ad]u»lnieiit. adjustment. >'vw Xcw Uislgn li esign plves gins Kelectahle sclectablc C to C ou(. out.. Full detalla detalle n our output out.put mnge» ranges nl of npprnx.) (approx.) 4k lo to 8k (MgheFl) (hil;the!'lt) or calalogtle. catalogue ,38 Jk 2k to 4k or k 1'-: to t.o 2k. 2k, etc. rlgbi right down lo to leh* 16Hz to 32Hz! Ami compatible llesign is enn PLUGS & SOCKETS S'iKxl And this new eonipntlblc design s even nunllcr: only smnllt>r:-only 3-5n a'::iin x 3-7in 3 7in ncluding including gnld* gold DX DN 'LUO \'LUG CHASSS efige cojlncxioh. SOCKET plated edge connexion. i-pln DM02T im.:luc\ ('s huilt variable ~-pln 8p 81' 0? DMO-'T neludpk built in varlnble depth 6p a-phl 9p 7p frequency shift trcmulant.. 3-pln 9p 7p. 7P~,2^. rnte frniucncy ahln tremulnni. 4-pln lop 7p 1)1\102 1>M !l2'25 DM02T plii 5-pin A 1180 ) (180 ) lop 7p, 3AJ SAJ 110; 110: 7-htaye 7'Htnge frequency i ]v tlcr tlh-ider n in 14-pin DL 5-pin 0-pln (240 ) lop package. : or!!quate wave input. 'Square 6-j»!n B <240? fi-pln 10p TOP 7p lop Op 9p My (isckogc. Sine Or pquare wave nput. wnvb wrwe output may ma.y be bc converted con\'~rtetl to saw-iuoth. saw-toot.h. lack JACK PLUGS!1 S0 ot' 9 94 US 16. Jin. Jln. Std. PLOG3 Mono PJwtlo P lb.stic Barrel Darrel 13p 21 DO each or 6 for 9-04 or 12 for fl'16. lsp J Std. Metalllarrcl 24p KcyboardH hi~h qullit.y. ~prung. 1 n. Bid. Mono Metal Barrel Zip Keyboard)* hlph quality, fully jprunff. fin. iln. Sid. Std. Stereo Ster~o Plisllo Plastic Barrel 18p l8p }'at-front Flat-front 46-i.ote 48-llote F f' lo to e F.: 16 U6i J ln. n. 8ld. Std. St Stereo creo MeU Metal Bamd BarreJ 30p 3()p Sloping-front Rloping froll t -jq-mde 4!1'fl(lte lo Z-Omm 2':)rnm Plant Pllllitlc lc Bmrrrl 9p Sloping-front lit-note >i)ni Slr'al Barrel fip Sloplnp-fronl ftl-nnte C to C ;:g~:~ 3-5n)m Plaatle W~ts~~cll~~~~~ Barrel 1 1:: fip ~ Swell pedfll pedal wllh with 10k log. loa', pol pot '5n'lln 3-5nim Metal Barrel JBp Spring 15p Sprlng Line ( : (illit )ilt (Short) "Spring: Vnlt (Lon~) lack JACK CHASSS SOCKETS Line L'nlt (Long) '5nmi ~'51l111l Open-type Open-t)'pe metal mdal flp Reverberation 9p Reverberation Driver jtodnfe Module :i'allllh 3>5ii)iii Open-type Open type metal Dp 9p S.A.F. S.A.E. plchfe please for ',r full delalla: details.: leadet leallet. ME8 ~E8 24.!" 1" St«). Sttl. Mono Open-type Open-t.ype metal lop (7eld-clod Gold-clad pholl"hor bronze 30p!" J^ptd.MoQO 8lll. Mono Moulded wllll wlt.h 2 '.! Palladium phonnhor-bnmic rarlh earth bar 16p Hip per wire oelavc 3(3p octa\'e length. per yd. bruk breali conucls contacts 4p 14p tl Omtaol Contact Block Dlock.fl k Z-m&kc :Z-makt: (0B2) (GD2) 28p 22-p r'btd.8tcre j" gtd.atcreo o Open-type Opcn-type Stop TahM rncker (white, metal Dp 15p WlTT^ grey Slop '. ur Tab" black) mckcr wilh type with DFDT not engraved DPDT BwRcb (while, red.!!witch 4Bp 49p Y J" Sid, Std. Stereo Moulded with 3 break cenwclb <;ontaets J-8p l8p PHONO SPECAL OFFER PROO Plastic-topped rlasllc-topped Plug 5p Screened PiuR 38p SW Audio Amp 1C TBA 810S BOS ~~r:~111:(~!:1~~ Chawln Kocket Single 1:: 1p QwaP r:qf}- 1 with Data Circuits Price Ch<Wis Chaartl? Socket. Twin 6p , TRA.NSFORMERS TRANSFORMERS LT700 LT«O0 mill, mill. output. Prl. Pri. k2; lk2; See, Sec. n 0 n a 200iliW W 6 ~Op Op "ELECTRONCS TODAY Sub min Sub-tnln mains fi-o-ev 6-0-6V 100mA looma 96p: 95p; NTERNATONAL" V 50mA B5p 95p (Size both apprnx. approx. 30 x 27 f x 2Cmm) 2limm) 4600 SYNTHESSER Min. Mln. main* mains O 6V 0-6V 500mA, 500mA. 0-6V BOOmA 500mA Zl 3G 2 3C We Block stock all part* 118rt~ for thl* this hrllljantly brllliantl}- designed 0-12V 0-12Y 2S0mA. 250mA. 0-12V 0-]2V 250mA ZoomA synt.besiser. Hynihe.-k'er, Thin ThJ9 neludco ncludes all the P.C.B.", P.C.D.i. mctal- metal 0-20\' 0-20V 150mA. 150lllA, 0-20V O 20V 50n]A loom.-\. 21 U work dclllrd drilled printed front panel giving 0-24V 125mA. l':!fima. 0-24V 125nl.-\ ZSmA! S a. a truly profowlonal professional finish. finh.h. Autborlt.ath e AulhorJatlve opinions Mains MT3AT: Sec: : Synthesiser is 12 11j-~ agree the E.T.. nternational BynthrelMr la ~ V V 2A A P r y^ - _ technically su auik-rlor p t~ rior tu to most moat of today's lodny'a mofjels. njo<!clff. MailltlMT20fiAT: Melhs51T20ftAT: 8ec:0'15- Sec: Complcte Complete constructional eonbitucllonfd delniln detallr in iu our booklet, 20V 20 V la. 1 A V la A 3, '. :' a\ a.ilahle AVAltahle shortly. xhortty. S.A.Tv..E. plea-vp pleru;e 101' for price Hit ";t aiut sj>felfltailon. specification. We ajro Srnthe~!!er P.O. BOX 3. 3, RAYLEGH. RAYLEGH, ESSEX. Tel.: Tel.; Southend-on-Sea (0702)44101 V'c hlso stock all parts for the P.E. Synthrslser lllnisclnic. Mln loon Jc. VAT Please add 8% to the r;nal final total. Post packing FREE in U.K. (Sp hling charge on orders under 1). First-class post pre-paid envelope supplied free with every order. ncludes dozens of 949

84 THE NEW NELSON-JONES FM TUNER. PUSH-BUTTON PUSH BUTTON VARCAP DODE JT, TUNNG (6 Position) w... ( = ('WW' JUNE '73) '13) i 1 1' i Exclusive Designer Approved Kits Whul What are the important Failures features to look For for in an FM tuner Kit? kit? M&tumlly Naturally it must mult have an attractive appearance when bultl, built, but it mult mult atso also embody the (atift late.t end best be.t n circuit dealon d.,qn KUCh luch >1? &1:- HOSFET MOSFET front end for excellent cross modulation perlormance performance low noise. PHASE 3 OAHC lunino lor htflh Relectlvlty. LED fine LOCKED lunlna ndicblors. Stereo decoder with Stereo mute, see below VARCAP ~~~~tat~~~~,~~r tuning diodes ~~gdhe:~~e~~~~~o n bach to back conflqurnlon configuration ipf for low dlstarhon. distortion. ~~~~n~~u~!f'&."~~~~~~r(wlth disable) r (88-104) CERAMC flltero flit." for defined F tesponbe. r.sponse. C PUSH STABLSED BUTTON tuning 5/C (with SC protecled AFC disable] protected powor power supply, over the FM b (Bfl-M) supply. NTEGRATED circuit F empliriors amplifiers lor for rallbbillly reliability und 3nd exceiienl excellent llmuina/au limiting/am rejection. CABNET double veneered against agai"'lst warp. The Nelson-Jones Tuner has all of these fflaluren feature ~ Bnd many more, more mportantly the design s fully proven not lust just wllh with a few prototypes but with many thouss of worklnjj working tuners apread spread RcroM across the wctld. world. r Typ. Spacn: Specn: 20 db qulellng quieting 0-75uV. 0 75uV. mage relectlon rejection TCdB.f.F. -70dB..F. Raicctlon Rejection ds. j db. Baolc Basle module 12'31, complete starting 26 ' + P.P. tuner GSp. modulo 8Sp, of prices course start all components as low as fill-ll, are available with comptata e separately. kits starung at 2«'95 (mono) Our low coif cost alienmentmrvice allonment,.tvlce ib is available to customers without access to a signal generator. ^ Pleaae Please send large SAE for our latesf latest prlca price llfilfl lists which details all ol of the many opuons options alju-u' SDeclal special low prlcea prices for comolble complete Kits. kits, All our Other other products remain available. «i nj^ n 1 PORTUS (W.W. Sep!. Stili distortion AND P.L. decoder HAYWOOD available. PHASE THO LOCKED THD typically DECODER 0-05% 0' 05% (at (W,W. Nelson-Jones Sept. '70). Nelson Jones Tuner Still O/P. the lowest level)! i ~ ' ' - ', 1 Suoplied Supplied complete Prico Prlce '1' complele when bought with Red with LED. a complel* complete N-JlUM;rkH N J tuner kit or -2fl 1'2911 ( bought separately (P.P. 21 p).. PLEASE NOTE. ExaUng EXisting tuners are readily con/ertlble con'/ertlble Klta/parts kits/parts ate are available for this j purpose. 4 *] i TEXAN We designed the the amplifier AMPLFER. (see phoiograph), Wo have photograph). Complele deelgnad Complete designer Lhe tuner designer upprovad case approved Texan metalwork kits are to match lha Texan -> - ** avillable available at 30*78 30'7. plus P.P. 65p ncluding including Teak Sleeve. :J NEW LOW COST STEREO TUNER Available as basic or complete kits Basic alereo tuner f5 post free. No alignmentregulred. Mullard LPBBfrontend module usodwilh CeramiclF tcampllfler. Basic g:: :~ ~:~eg tt~~:: :~: ~g:: f~::: - ~~:~i~~~:~t::~~i~e&. ~:~:~~n~~i~~61~~~:set~~,~~dm~t~:~~st::~t~jr~~~cel~~n~,l(;i~~~"r{ci n 6 ooshlon mono position push tuner button t2 units post free. wllh with i * - ^je* tuning p ' Jal, hutton ndicator, tuning indicator, phase (6 position) locked )C with C decoder, nterstation complete Mute, restricted metalwork range metalwork AFC, veneered single cabinet. LEO ntegral pots 2*92. 2'92. bva'-i Complete le idl:'nti TYP. SPECFCATON 1^:.- ^ Complele with JC regulated PSU full assembly nstructions. (Mechanically donlical to N-J Tuner.) Access N J Tuner.) Complete ' ~Access 2^V 2/'V lorsodb for30db S/N W**'' PRCE Complele stereo kit 28*42 S N kit 24,19 mage F rolectlon dodb Complete mono Mt 24*19 :~~!\::r.~:~:::odb rejection esdb VAr. VAT at B% 8% is included n in aff all prices P. 4. &. P. 65p NTEGREX LMTED, P.O. Box 45, Derby. Derby, DE DE11TW ttw Phone Swadlincote (02B387) (028381) 5432 Telex Fully guaranteed ndividually packed TRANSSTORS, DODES etc. fflomflp ALL valves AC 113 ~ A~' 139 TJSV BSY27 27 OA OC 200 2N 3053 V 1 ^ guaranteed VALVES AC _o\c ian 126 AF 178 RSV BSY 38 0." OC~Ol 2N CiliT ".!tlp4 J U'186 BSY 90A OC22 SX i{j" 2N G7 50p ~i)l6gt 'Op liotj4 60p A1065 A065 11* CU0 ECLSO 65p 55p 07,34 GZ34 lot 70; Py0O AC 127 B9Y SfiA 30 OAZSfl OO 22 CSCTCT 40p jnm 1110 COCO 70p PY80 40P 40p 128 AFZ :.! BYZ S QC ZR 11 '2N SJi 55p 30C ,00 AB8 AR8 Mp 55p ECL82 85p r.z37 GZ PYfil PY81 40P AC 40. AG BTZ10 OC 25 6S«7 60p.MLSr.T 7Op 6064 Mp ABY26 CR81/10 00 eo ZR el 2N SJi(;T 35p ATP4 bflp 50p ECLdS ECLS3 70p KT66 * PYSO PY82 40i 40. ACT ACY 18 CRS mo OC 0 CSJ7 65p 30C *00 ASY 27 ~~ N 23.-\ 21\ SK7 55p 30C \l 3D B12H 8 1.' ECLa6 ECLS6 50p KT '1'0000 PY8^ PY83 401' 40l' 40p ACT AOY 1!) CR81/20 OC 8 03J7OT f) 19.~SY 28 ORS ~!9 11'\"25 2N ::7:Jl SSL.GT 3W \l 26 CT31 CY31 60p 50p EF36 6Sp 65p >TH4 MH4 76p 75p PY38 PY88 45? 45j> 45. ACT ACY 0 CRS 1/30 OC 29 63K7 Wp 66p 30C7 30C18 1 SOp «0B0 2*80 70p 20 BC lob N 32A 2~ SliWT 301'L B 1.'1 26 ]>AF96 DAF96 A5p 55p EF37A MLfl ML6 66p 85p PY50021'00 PY ACT ACY2B 28 CRS 1/40 OC 35 8SL7CT SOp 30F5 1* nc 118 CRS 3/10 OC 38 8SX70T 3~ N 38A ~S" SQ' 65p fo"l12 80~O U 'OO PP96 DF96 66p HO PY ACY nc119 CRB 3/20 OC4!! N 43 2N V6G 16p HO SK»B 65p DK96 7Dp 70p EF40 1*20?fip *2 OA p 45p 45. PY801 PV800 fl0. 45ji 50p ACT ACT ACY CRS 8/20 OC 42 6SQ7 S5p 50p 30FL1-J aofh 1*00 80* *26 00 BC 136 N 70!!N 40Gl 6V6GT H DL92 40p EF41 Mp 65. PABC80 40p 40. ^Q QQV03 10 v CRS 3/30 OC 44 0V0G BP * BC 137 ers 046 l :i 277 2N 47Rti OX4 40. r~15 S5p 0003 DL93 DL9S 60p 60. EF0O EF80 OOp 30p peg? PC97 fiop 03-0 SOp l' A> ADJGJ NO CRS 3/40 O 40 OV5GT 161 lch8a CRsvo/dj ens '25 /C25 OCTO 0X4 Wp 30FL14 00p 0002 SOp 70 N 415C 2N X5G DY88/87 DY86/87 1,26 P p QQ\ ' )fi2 nc 172 GET 11 6 N N 128 6X5GT 50p 30Pl~ ' p 40b EFflS 40p EF EF85 asp PCODO PCC84 COp 40b QQV06-40A l) A1> 8-00 AD?. 16,\DZ 11 OETllfl OC 73 0X3C 40b 40b 30MS 30L17 flip flop )003 35p 70p 0X3OT Jl DC 172A GET 116 OC 78 '!!i 456A 3~ 154 6Y6G 90p 30P9 1,00 DY802 U. EF8S 35p PCC85 40n 40. <lv0a-l2 QV03 12 ovflc 60f eop.lopl'i aopjo 1*00 i*oo Sp )2 nc212a OEX fit; 007"D 2N 708 3N 159 OZ4 65p 30PLt 95p EB8CC/01 EB8CC/Ol EBdCC/01 DYfl02 45p EF86 EF89 3Jp PCC8B PCCftfi PCC88 flop 4Qp 110 HO ADZ AFH p 30PL 85p, BOY 31,SKT 222 OC81 2~ 9R '2830a 6 30L PL3 C.R. Tube BF91 EFfli Em E~'91 45d 30p 45p 46. PCCBO PCC&R POC89 60p 80n 50p R19 M0 R9 6O3 60. AF AK L2 90p aopl3 C^.Tobei ncy 33 OA {) OC82 '2N ) D7 80. HO E180CC 7B7 80p 1*10 UU7«3 E80CC 70p E~'92 50p PCCS9 60p 8Cl/ BeY?2 OA 47 OC82D 2N 1 30~ p 30P14 HO Eia'JCC 7Op em 3Op 1* p 8C1/400 _ ap 118 7Y4 SOp 30 PS E182CC EF95 40p PC~' BF 115 OA 70 OC B2DM?N DS 40. 3:;L6GT DG EF05 1,26 EFWS E~' ls3 53B 4Op FCFSO 85. PCF82 40? 40p 40p Sd/OOO 28 SC/600, 0) AF 117 ADS 4Qs> UOLCCT 75p DG13.2 v AP116 A}' 118 m' 107 0'\ 71 OC 83 :.!N lle'! UW EA50 4Op 40. EF184 EFlS4 35? 85. FCFfll pm'84 00p 60p ^,00 U 'OO AF E W4 60p 18*00 )'14 DF 185 OA 73 OC 139 2N ~062 OS68 12A6 55. :i[iz4gt 'Op ){W3 35 EABCBO EADC0O 40p 40. EFWOOOSp EFL200 76p PCF86 PCF.S OOp ap SP6l 75. AF Al<~ A0 55P 33Z4CT 70p MWla nl'y 51 OA 79 OC 140 2N ~ (iocu 60p 1.'15-00 EAF42 12AT6 4Sp 00C6 80p ,50 TT A}o' 1~ 6 BFY 52 OA 91 OC 170 'N UOCD6G VCR139A EB91 7Bp 30p EL ELa4 2 EL34 70p 50 FCF20X PCF200 76p PCF201 75p T. H?5 1 " 21 U P AF AF 156 Al~ AT7 40p 50CD(JG VCB139A 12j Bl-'Y 90 OA 200 OC 172 2N AU7 85p HO 8,00 EBC AU- 35p POF801 U AV6 GOP 75 1,00 abp HO EB041 EBC41 75p 76p EDO? EL36 EL37 1*80 flop PCF80L PCFS02 PCF802 BOp 65p 8 50p li2i "fl 76? 12AV8 SOp »P p 85p 75C1 75p 88D!t 00 E8F30 EB>'80 40p 40. KL41 EL41 80b 80p PCF805 Mp VlQ^ 90p U191 75p UKM 12AX7 35B 7SCX?5p OSD 9 00 UF8G 45p R5 --V.A.T.-- BBGOG 90., SHS 85p 12BA6 46p 76 76p 88J 8-00 EBF63 ELBl 80. PCF806 U UF GBJG 85. 6J4' VA 12BEG i EUFflS EBF83 SOp 60p 40. Km ELfll ELS2 QOp 00 PCFa06 55p PCFaos rcffl 76p VM} ii "p UFfti 46p EBF89 4Qp BL82 33P PCKS PCF808 OOp 90p UABC80 U... yw. R3 RO 40p -V.A.T.- OBCOa obcac UAl T4 80. Please 8 % OBJd 63p 0J4WA gopiarta OOptOtZO 36p 120E AS 48p 60p 45p 70 73p 8SJ 8 OO 00 6BQ7A 80. H5 75. EC52 EC EL84 80p > inn 9 PCH20080p 40. ULS4 1X2A 80p to orders SBR J5 85p M2 75p ECC81 ECCai EC35 25p «0p ELM 40. ELS6 EL83 SOp OOp 60. 'CH*. CH200 80p ja "P EL84 i/wi "EfiO fiop 1T4 1S4 30? ^r do/ /O CBJfl 6EQ7A flop 65p 6J4WA 123 l^bee 12BH7 (iop 78 73p 70p 75P 88L 0 00 PCLS UY41 lx BW J6f}T 13'50 723a/b 8 00 Special ECCfll lop ELSfl p ELS6 40p LS 55p UAF42 flfip..y.. UL84 40p 70p m ECC82 36p ELSB 46p 46. PCLS'2 PCXf PCL82 40p fop ybc4l UBC41 flop X2A 1X7A 1X28 sop sop r tr» all orrfprc add a^. c 6BK7 0B 6BR? q 1*20 0J5.. OEWO 120 fl0ll fll'oo «JWT 635 S1 Sfip.2B 12C8 isbh? 12El fiip 60p 60 «5A p 72a«/b W 75y M fp«cj*l n,, ;H? 25^ 80. t'v4i UY85 45p 60p 3Y3GT 65. 6AQ5 6BW7!) oo 6J6 80p 12K6 HO 6-00 Valnl ECC83 ECCflS 96p 4SD X2S Hn Q all oroers 45p snwo 8BW1 ti 1100 oo UWT SJC 60p SOa ZEl 13 fimo do TSSa/b pedal 86p EL90 «p..-1 PCL83 CBp CBF60 'ill UBF80 40p 0 p UY83 VR103/30 40p VR05/30 2K25 2D21 9 BOp Y3UT 5Z3 80p Mp SAQaW fla<4fi 6AQ5W 70. 6C! 40. 6J7 SOp C\,239 ECC84 86p ELlS04 ELe04 80p PCL? ' 70p 46p 6C4 8BW p flj7 QJC 80a COp 12K3 12K7GT60p 1*10 50d CV239 vitm POLS4 45. UBF89 40p 45p p 6A8S 80. 6C6 50p 6J7G K80T 85p 45'00 ECC85 ECC93 4Op 85pEL604 40p EM31 BOp 0Op PCLS4 60p 4Bpn/'aFefl 4Cp 46p 3A4 BOp 5Z4 SOp 6AS0 SOp PCLS6 UBL D6 5Z.aOT 55. SATS 46p 6CB6 60p OK6GT 80p 12Q7GT )1503 2J42 ECC86 fiop 90. EM0O EM80 66p eop 55. 6Dp LULl «-og VR130/30 5Z40T 55p 6AT6 45p 8CS 8C8 30p flcds OJTG 0J7G 40p 12K8aT70p8D7 WKSQTTOp p 65p 65P PCL805 60p p 3S AB AUS 40. OOHS 1-45 OK7 55p 12SA7GT 866A '00 ECCSS ECC88 6Op 60p EM84 65p OOP PCL PFL5 OS 60p «0p UBL21 L'RLl 1-00 TOp VR150/30 3Dfl iio 3 S 4 40p p 5240T SAB7 Sip flop SAT6 BAUfl 45? 40b SCDS OCUO SOp 8K6GT SOp 'iqtot 70p 813 6* ?Op UC085 4S. X61}! V4 65p 60. 6A\' L6 6K7G A ECC189 ECXJ189 7Dp 70. RM87 EMS7 1*00 40p PFL PL36 7flp "TLyi 60. UOF80 76p X66 65p 58/2G4M 6AH6 70. GAX4GT 55. 6K8GT 60p 12SG KRN2A ECFflO ECFHO 440. Op EY6 EY51 46p PL61 PW6 flop UCC6S TCFSO C65 7ffp X8lil 4Sd ^4 40p BAD7 6ACT flop BAUfl 40p 46p OCUfl 8GL«1-43 6K7 B5p 128A7CT 8CCA 1*20 42 F80 75p 45p 7Cp X0fl X8lM l-40av4 fl5p C6p 68/254M B8/234M BBp 6AC7 OA 110 COp 70p 6AV6 8AX4GT OAX^GT 45p SCLfl SDO 6D6 75p fi5p fik7g OKflGT SOp 6Dp 12SO? 70p 65c 551A 054 6*00 50p K301 7*00 PLS 50p UCH42 7tip ZBOOU tl-\k EA K26 f!l ECF82 ECF87 4Op 40p ETSl 4Bp EY81 PLSl fiop UCQ4S 7fiB 7800X1 OAKS 6EA9 45p UOR81 \l 70 ;:ib255u 6AK AX5GT 6}~7 HO 6L P OY4 250 ECF801 ECF80 75? 75. KY«6 EYSS 4Op p PL63 PL82 46p CCH fip 4lip ^fioou SB2555! AK5 SAKS 40p ' 76p ODb 85p 8K J7 65p p BOp KRX2A PLS3 4Sp 45p UCLW3 HSl UCL82 4Jp 45p 45. ZaOlV B255J Z80l U \l AK3 SAL5 A 30p 40p GAX60T 76? fleas f!l 00 6F7 11*10 6Lfl Y4 40p»36 50p fl iop sop 600 6F8G 75. OL6G S7 f!l ECR3. ECH33 EYS8 ey8b 60? 60p PLS p Z900T HO 5R4GY 90. 6AL5W 70. 6F'J L7G AQ TY EZ40 Mp PLa4 70p PL50. 4ap UCL83 L6*3 fi3p 45p ZSOU 2-70 DR4CY 3 0Dp 60 6A Li SOp 65p 637 1*00 SFSO 8X23 75p 6LCG Op * iop OY lfl4» PLlS04 80p 70p la3 56p 5U Al6 45p 6BA6 85p 6}t'32 76p 6SA ECH42 0Qp 80p BZ41 EZ41 7Op 75. PL50 PL504 BOp UF41 LS3 «5p 7)p ZOOOT 1A3 1 66p 0 3^40 5R40Y 9Dp 60p 0AL5W 43p 55p p SF32 ay23 OOp OLTO 40p 10AQ5 05p p SOp PL UF80 36p ll4 Up 55. 6ANS Up 6BE6 6Fa SA7GT Ga A \l3'00 ECH81 EC Up EZS0 EZBO 73p 30p 30D PLOW PL50B110D PL3(l9 135 UFflO 7Op 2Sp 65p 5V B5p SOp 6AM6 4ip floes 68A0 40p 33p 8F32 75p 69 A7 60p 19G L629 70p TT * p 1L4 26q 3V40 65? BANS 46p floefl 40? af &3A7GT40p 10C T25A 23*00 PL50911'85 f!l4 '00 593: J/192 ECHSS ECH83 ibp 45p EZai EZ81 30p 3Op PL3W PL902 PLS p JmU P081'AL 11. PERSONAL WELCOB. 20P p ECB84 EGHS4 43plOY GY601 76plpY33 KMMUM POSl'AL ORDER L PEHflOHAL CALLERS WELCOME. [ 20PS 20P p fi p?Spl 00 2J/ M W PY /AM' Jll~N" OTHE/t3 OTlEB N lndlll. (,'",1&04. Rail Tub" Gnd SJHtial Vat"",. Postage pmtafib Up W lo STOCK to i2 8 2p, 12p, f2-3 induiit 2 8 2*2?. (Jolhod* 22p. Orer«pa»trre«.C.O-D,25pitlr». Hat T»b*» Spt'lal Fal P, U.K. C777777Z Over 3 POlt fru. C.O.D. utra. VALVES Telephone 1 k AND enouities TRANSSTORS 1 1 enquiries for valva. valves, ~alve8, 29/41FT. 2&/41FT. AERfALS AERALS each consisting of ten 3lt.. 3ft., Jin.,n. transistors, franslalora, etc., retail ; A lot of lhe# these valves nra are mported imported prlceu die. dla. tubulfl' tubular acrew-ln 'crew' n secllong. sections. lift. 11ft. {i-sectjon) (6 sectlon) whip trade export , vary for each delivery, delivery. jo so we reserve the right aerial adaptor 71n. rod, to change prices for new slock stock when unavoidable. slay plate with idapior slay stay assemblies, easemblles, to fit the 7Jn. pegs, rod. reamer, rasmar, nsulated hammer, base, elc. etc. Absolutely br now completa complete ready to erect. Colomor (Electronics) Ltd. n canvas bag new ,51 slightly sllohtly used. 170 GOLDHAWK GOLOHAWK ROAD. LONDON Wia. W12. Carriage 1*60. ' SO. Open Op.n , 9-12, p.m. Thuflday Tnui.Oav 9-1 D-1 p.m. o.m S0

85 GRO NO Access accepted, SPECAL RSSSTOR KTS (Pricei nclude potc A packing) W 0 P & P' l Op on o 5 Sicouiu C W.O %, only, P. A 10-15% P. 0p en (except orders net below items) 45 tems) Export Order r enquiries r ies welcome (VAT free) (ree) Official OffiCial Orders accepted from Educacioral Educational & Departments ALL PRCES A fnclude Government NCLUDE VAT Deparcmeors AT.~T 6% 8% Due to current world shortages, resistor bits may contain somo wattage value substitutions. 250V HULLARD P.C, Mounting: POLYESTER O-OJ^F, 0 CAPACfTOHS OlSwF, 0 022>jf, C280 O O^JtfF. SERES 0 047i/F. 34p. O-WBuf RESfSTORS G= Discount 0-' OO/c % SPECAL RESSTOR KTS (Prices include post & packing) QE21W OE2 tw or ohms- or 5%). ] 58 0E2 OE2 4W tw KT: KT: 10 >0 of of each each E2 E2 value. value ohmt M. ohm» M. ohms-m. > a a total total of of (CARBON (CARBON FLM FLM 5%), 5%), C3-5B 5'%), 1-77 ' net net 25Ef2 25El rw ohms- H, tocal 5 % ), E2 +W tw KT: KT: of of or each each E12 E2 value, value, ohms M. ohmj M, ohms- total total of of (425 or 1425 (CARBON (CARBON FLM FLM 5%). 5%J, 5%) net net 5612 SE2 W tw KT: 5 of each E2 value. 10 ohms ohms- M. M, a total of 305 (METAL FLM 5%). S-Yo), net Due to current world shortages, resistor k its may contain some wattage value substitutions. MULLARD POLYESTER CAPACTORS C280 SERES RESSTORS 250V P.C. Moun,;ng: O O/lF /lF /lF. O 033/lF /lF. 3tp. 0 '0681'F 0 O f#if, /lf. 4ip. 4tp O-JS^F. 0 15/lF. 4Vp. 4tp. 0'22^F, 0 22/lF. 5)p. S p. 0-33uF. O 13/lF. Bp. 8p. 0'47iiF, 0 47/lF. 9p. O-fiauF. CF-High Sub 5 1o MF-High S% ' 0-68/lF. lip 12p luf, CF High Scab Carbon Film, 5% MF High Stab Metal Film. 5%. /lf. isp. 15p. -S/iF,. 5/lF. 23 2]p. p. 2-2pF. 2 2/lF. 26p, w. 26p. W. Type Range O Size mm MULLARD t 22-M 0 75 ' 0 ' 2 4x7 5 POLYESTER CAPACTORS C296 SERES CF 22-1M t '4x V: t x0 5 O O OO'F. OOipF, /lF. OOlSitF, 0 O OOU"F. 0022uF 'F. 0033uF, 'F. O047uF. lip. 2ip B/lF. 006BuF, O O O/lF. OluF. i CF 22-2M2 f 0'7S 0 0-5S 3.9xJD M 75 0 '60 0 ' /lF. 01 SfiF, 0 022/F. 022;(F 'F. 033mF. ))p. ]tp. O 0 047'F. 047liF. O 0-06B/,F. O60/<F. O'JpP, O "F. 4lp. 4! O 0 ls/if, 15/F. 6)p 4 6t p * 10-2M mF. 0 22/lF. Bio- 8tp. 0-33JF. 0 33"F. 2p. 12p if. 0 47/lF. Hp. i CF MF 22-1M fo-2m7 0 J -7S S - 3x7 5'5x16 14p.,. 160V: 10-2M2 1-4] 1' x0 B O'OlpF, O O/lF. 0'15/jF, 0 15/lF. 0'O?2^F3o. 0'0221'F Jp /lF. 047^F pF. 06e^F, 3)p. ]tp. 0-luF, O 'F. dip, 4! p. O-SuF. 0 15iJ Sp 4- MF 0-2M f'2( * 10-9 Sp. 10-OM 1 9B B 1'65 6 ' 6x ^F. 0 22/lF. 5)p. Stp. O 13/lF. 6Jp. 6tp. 0-47pF, 0 47/lF. OJp. 8ip. O-CBpF, 0 6B'F. 2p. 12p. pf, /lf. J4p. 1 MF 0-0M *6x13 14p. 2 MF 0-0M 10-OM ' 3 ' 08 OB x17-5 Bx17'5 MNATURE CERAMC PLATE CAPACTORS For value mixing ing prices, please refer to our catalogue, catalogue. (price in pence each). SOV; 50V: (pf) , B. 82, SO. f8d ( 220, 270, , 470. V~LUES AVALABLE-E2 only , K. KS,2K2 K5. 2K2. 1 3K3.4K7.6K0.OiF) 6KB. (/F) ' ' ' '047. VALUES AVALABLE^EZ Series Only. (Net prices above 100.) 2ip. 2tp. each. e.ch V, 30V. 5p. Sp. PRESET SKELETON POTENTOMETERS POLYSTYRENE CAPACTORS 160V 5% 0 2SW 01" 2K2, (tif> (pf) 10. S , , SO , K7. MNATURE0-2SW 4K7, 10K, OK, etc. op up to Vertical M M 12 or horizontal6p each K, 2K2. Cl tp. SUB-MN 0 ' 05W Vertical, 100 Cl to 220K Cl 5p each. 4700, ,000, 4ip. 5UB-NN 0-05W Vertical, 100 f) to 220K f) 5p each., ^ (P.W.)61 CHEDD1NGTON CHEDDNGTON ROAD. PTSTONE NR. LEGHTON BUZZARD. BEDS. LU7 9AQ B. H. COMPOMEMT COMPONENT FACTORS LTD. N " Tel. : Chedd;ngton (S,d. Code 0296) CATALOGUE No. 3 20p 9A0 Miniature Mulfard Mullard Eiectrolytics Electrolytics VEROBOARD POTENTOMETERS 'O/iF 63V 6tp 69(iF 16V 2t x 5" 16p Cubon Track n lm n, log 01" lin). Single. 161p single 1-5uF 63V 6tp ft" xs' 36p J6p Carbon 2t x 3~ " ]Jp lsp 16p, Pots. OK. look. SOOK, semi 14p. 4Smm. 2-2^F 63V 6BttF 63V lip 2}x3f- 33p 25p switch Z6p.Slider Trick 5K O Pott, to 2M 0K, fl, leg 00K, orlin WOK. ( temi K lln). log Single, 30mm, 61p 34p- Dual Gang 46p. Log tingle with 6tp 3l x 5" 41p 46p Cans 3-3^F 63V loo^f 10V 6Jp 3} * 5 42p 46p 1 47p. 60mm, 55p. 6tp 00«F 2SV 6)p 4 it = ~r 1;~ ];~ N400161p P;n 12p (uf/v): 1/25.2/25.4/25. 4 ' 7/10.5/25. B/25. 10/10. 10/ pF -DwF 63V 40V loopf 63V i4p ^ X " 36p 36p DODES 1" 9p 9p rn400 6Jp PLUGS :t~ 50MF 16V.6ip 21x5" 2t 5" (Plain) (Pla;n) - 19p :~~ggi 7,~ P;n 6-e^F ~:J~ :~~ t~&~~o:-s.j.~h~~/51~ ';?~"1ci/~g~2~8!~~bgiig.0/frj,.6Vrio7~~~0 1::: 6tp 0 -OuF 63V 40V & 50MF 63V,- Sp K 2* x Plain) Hp N4002 7ip DN 2 Pin Hp fuf/v): ELECTROLYTC 1/25. 2(25, 4/15, CAPACTORS. 4-7/10, 5/25. 9/25. Tubular io/jo, & 10/50, Large 16/25. C«n«3 Pin Up 22/63.75/35.25/50.32/25.50/25, 100/ /35,6^.50/50. flp. itx'l~r(~r~i~» = ~;~ N400490p 500/50. 18p. 1000/10. 6tp 220aF 6-4V 6)p 5 X SJ/'tPlain^ 6p (OpF nser,;on 7]p 7]p N400512p j.ck 20p. 8ap. 2000/25. lop. 2000/100. 9]p. ]8p 6tp lopf 16V 25V 64p 220wF 10V 6ip niertion tool 29p N4004 N p 9p Std. 5 Pin Jack BO 20p Hp 100/50, 200/25. Up. 250/50, Bp. 500/10. Up. 50O/3S, Sp. 73p 7lp N400S lip 2.5mm Jack Up 30p. 500/50, 1000/ p. J000/(0. BBp. 3000/25, Sp. 1000/25. 30p. 3000/ p. 1000/50. 93p. 40p. 2500/ /10. 30p Cutter N400614p 2500/ /25. 65p. 5000/ tp lopf 6tp P;n 22p 22p N914 ~~C2K~TS 10 H-VOLT! 4/ p. 8/]50. 19p. loo/loo 16/]50. 22p. SpF 63V 64P 220uF 16V 6*P HOpF 63 )6V V 0o Track lip Pirn, Pkt. Cotter 25 56p 56p N40O6 2Zp 21p N94 Hp 7p Phono 6tp ~1%~ ~: pi~ 10~ 2]p ]Jp. 100/250. lop. 5PF 63V 6*p 6tp TRANSSTORS OA5 5 P;n p 6UF 40V 6iP 330AF 330uF 63 16V V Hp N96 7p SOCKETS 6p 2500/50, 61p., 6Jp. SOQ0/S0, El-00. 2Sp TRANS STORS BA100 lop Din 2 Pin iop H-VOLT: 6tP 16tp BC212L 12p Sp 0 05/lF. O "F. 0 ' "F. 7tp. /lf. 22pF 25V eyp 470MF 6tp AC28 22p BC213L 12p lip 2.5mmJ.ck ]p 0 ' ' p tp. 5. 0'01. 32uF 63V 61p 470aF 6-4 BC07 lip 17p 8p lip. O OU. ]p. 0 ' 047. ' 1. 15p. 0 ' 22. 2]p ]4p. 32MF 10V 6iP 680pF 40V (6V 2ap 9p AC27 33uF 16V 6jP :t~ 680xiF 40V 5» AC 128 J6ip BCL Hp OAS 42p 3 Pin lop 16/ p. 32/350, 4/350. Hp- 33p. 8/350, 50/250. Hp. 20p. 100/ /250, 20p. 30p. 16/ p. lip ec2i3l no OA47 9p S Pin 180 Hp Mp BC107 6tp :~:g~ :~: gg1 ;: ----,S:':T:":O:-P:,;...P:-R:-E:-S:-S:--:-/ 6J :-Sc-r-'ee-n-e-:d-:W=;r-e~. M::-et-r-e :-6:-:t-:P-:':--N-E-W-K--T pF 40V fifp OOOUF 16/ 20p BC109 Hp BC214L 7p OAB Hp Std.Jack 5p 250V: METALLSED 0-05/iF, O-f/iF. PAPER 6p CAPACTORS 6p. 0-SpF, 7+p. pf. 9p. 500V: Hp OC44 flp OA200 Bp 2.5 mm Jack 3p Phono 6p Hp. 0, ,, Up- 6p l.6p Sp. 7lp, Up. 9p. 0-47, 1000V: 34p tp OOO/JF 25V 15p BC09 Hp OC7 Hp 32iiF 63V 6tp :~::: :~: g~t~o ~~: Our Retail Shop r:~~;s~~~~~~dwj:j~ e~m~t~e :~: SE2 ~W Metal 47iiF 10V ifp l500uf6 4V Sp BCH8 Hp OC0 dp STOP PRESS 6tp BCfa2L p p be 2tp OQ-M 47pF 25V 6»p SOO/iF 16V 25p BC149 Hp OC70 Up Our Retail Shop Twin Screened Screened Wire, Wire, Metre Metre dip Hp NEW KT 6tp 47pF 63V 2200MF 10V 25p BC87L 2p TS43 33p should now be open Stereo Screened Wire. Metre Hp 5E2 iw Men! Film. i 8p 3300^F6 4V 26p BCi 03L Hp 2N2926 flp at 59 North St., Connecting Wire. All colours, Metre l^p g~::~t :~: i~i;~~ ::: Neon Bulb. 90V Wire Ended 5 for 24p 5 each value lod-m. 8C1B4L 3p 2N3702 Up Lcighton L:~,s:t:,.o~~~::;d Buicard Panel ~a~~1 Neon. ~~~b~.9f4~:~~d,eac:;~er. 240V Red, Amber, Clear 5 for 20p ~~: total of ' MULTMETER U431J U4]2] MULTMETER U434 U4]41 NEW CAPACTOR KTS 22 Ranges plus AF/F Oscilla- Oscilla Ranges s plus plus Transistor Transistor Tester, TestH. C280 Kit-PC Mountjn~ 0 01 tor /Volt n 16,7000/Volt Overload protected, C780 Kit PC Mountlns: polyester 2S0V. 5 of each value: 0-01 protected. ' 022. ' O U"F. 2 or JlF. 1 ']0 net. Vdc O-S.1000V Vdc-O S-OOOV in 7 ranges ~....., Vde_ V Vdc-O 3-900V in 8 ranges , 0 047, i;F.2 a f ;/F. l'30ncc. Vac 2-S 1000V Vac-2 S-OaOV in 6 ranges * Vac Vac- -5 7S0V ' S-750V in 6 ranges. nnges. C296 Kit Tubular Kit-Tubular polyaster, polye"ter. 0400V. 5 of each value: 0-01, 0 ' 01, Jdc mA dc-o ' OS-SOOmA in 5 ranges dc 0 dc-o ' mA mA in S 5 ranges, , , ' F. 22wF. 2 of or 0-47pF F. 1,]0 30 net. Resistance SO MQ Resistance-SO-MO in 4 '" 'iq. ". "" ~,, K lac mA lac-o ' 3-300mA in 4 ranges. Ceramic Kit-square planuette SOY. 22. ranges. Resistance-1KO-1Mn in" ranges. A pF pF. O OlF. ' ]0 Accuracy 5 /a ~:c~er~cy_s% of F-S.O. Resistance KO 2Mfl in 4 nnges. Coramlc Kit square planuettc 50V. 5 each value: 22, 33, 47. F.S.D... ~.- Accuracy dc 2j%.tc 4%o' Accuracy-dc-lf %. ac-"'4 %of F.S.O 100. F.S.D ~. OSCLLATOR OSCLLATOR- KH<.nd KHz (A, M.) at approx, KHz approx. Volt. 465 hfc in 2 ranges, net , 470. looopf, PF, O OlpF. 110 Size 115 gr:~?is3;~;~; x 2) 5 x 90mm. 90~~~ ' : 150V 2S0V Paper kit Tubular kit-tubular metal case. 3 of each e value: 0 -OS, 05, '1. Siac /lF. net. Size-160 x 97 * x 40m 40mm. i m. Complete with steal steel Carrying lt:f. 90p nat. carrying Supplied complete with w carrying cal"l"ying case, ten test leads, leads. battery. 500V SOOV Paper Kit Tubular Kit~Tubular metal case, case. 3 of each value: 0 ' , cam, case, test leads battery. PRCE 11 HO 30 net p & p 30p ' 0-25, D-SuF. 0 5"F. 9Dp 90p net. ne'. PRCE ,]0 nee net pfi p & p 15p. 25p. U4323 U434 U4H QOOV 1000V Paper Kit- - -Tubular metal case. 3 each value; value: , ] "F. 10 MULTMETER U4314 U4124 MULTMETER U , O OS, 0'l/#F net. U4]U Ranges. Ranees. High sensitivity. 33 ranges. Knife edge edce with mirror scale. S-DeC Oalo t8p 20,0000/Volt. 20,OOOO Overload Ovel"load protected Volt. mvdc-75mv_ Vdc-O V S OeC 2, Vdc V in 9 ranges. Vdc t 000fl/Vott. Vdc V;n 5 600V High in accuracy. ranges. mvdc JSmV, ~.1. S'DeC 114 METERS PANEL "expert" Dalo Pen solder gun fs'ss 98p 2'" x Smtrs. 17p Vac 3 900V Vac-3-900V in B 8 ranges. Vac Vac V S-600V in 9 ranges. J - T-DeC T OeC 3-92 scale Wire pack 5 * Smtrt. 27p ), 100JlA SO lsp dc 4) dc-o 06 3A 06--3A n in 6 ranges, dc dc--6o-120 microampt microamps in 2 «DeC JlDeC "A" 100;/A Diode pack (Ge) 50 for 25p J. ck.on 365pF 98p lac 0-3 3A lac-o ' l-3a n in 5 ranges. rances. dc 0-6 SOOmA dc-q mA in ranges, 4'30 4']0 J00;;A Jackson :;OO"A CB04. 5pF. 10pF. 15pF 8lp Resistance 25Q SMQ Resistanc::e-2S0-SMO in 5 ranges. lac 0-6 SOOmA lac-q ' 6-SOOmA in 6 ranges. 1 udec //DeC "R" "8" 20pF. 25pF. 50pF 89p Accuracy dc Accuracy-dc:: R 2^% R-2to/o of or F.S.D..» Resiscance-Kn-MO ranges_ ~ ' 5] SmA 60pF. 75pF. 100pF ac db 4% db--4 / o of F.S.D. Resistance KD MQ in 4 ra nges ma All C804. 5pF, "00" OpF. 36SDf SpF 90p Blp lopf. 25pp. 50pf a9p db scale 10 to + lldb. 220eC DeC mA at 60pF, 75pF, loopf 98p. 72 )'75 Dilecon 00,300, Size 167 Size-167 x x 63mm. Accuracy dc ~~:~~!~y_d~~t,ot01, i%, ac 2f /!~~it%) _ Size-liS 21S. 500pF 1 ' 15 Supplied complete with storage case, 0 10mA 3-75 DUecan CO, 300, 5 ror tose test leads, spare diode, battery. Size 115 x 215 x 90mm. ANTEX SOmA Complete with Jiecl steel Carrying carrying case, CCN240,4] Panell/holder 4 Up, PRCE net p»& p 2Sp. 25p. test leads, battery, CCN mA LED. SOOpF TL 209 S for <r'l5 1 battery P1W,lP6W. U4124 PRCE ] ' net p A & p 30p. lop. U433 CN mA Panel l/hotder4 colours 13p U4113 X ' A la 3P4W. R'ry Sw'chs, 4P3W PJ2W.2P6W. 6P2W 30PX lop COMPLETE NEW RANGE We have a new range of low cost frequency counters We have a new range of low cost frequency counters frequency stards, not to mention our instrument cases, metal boxes Eurithmic Loudspeaker systems, systems. We supply calculators from 11'00 00 up + Books, Digital Clocks, Hi-Fi Components, Quadraphonic Records Kits, Dolby units Uher Tape recorders. Our //sis lists are free but postage would be appreciated. free but postage would be appreciated. S1udiD Studta ' Etec1rDni Electronics CS P.O. BOX 18 HARLOW CM18 6SH ESSEX TEL: HARLOW (STD 0279) P.O. BOX 18 HARLOW CM18 6SH ESSEX TEL: HARLOW (STD 0279) VHF MODULATOR Which enables the use of a stard TV as a monitor for CCTV Video games (TV Tennis), Tennis). Operates from 8V-12 VDC. Tuneable over VHF Channels nput Stard nput--stard V 1V poss Video. Output 7 Output--7 5mV into 75ohm 750hm at 600 MHZ. Dimensions 2^" 2t" x 2" x i' 6' tll-6' Coax, Coax. Price Fully Price--Fully Assembled Tested 6-50 ' inc. VAT V postage. PQstage. Please send -cheque or P.O. with order to: STRONG ELECTRONCS LMTED Bourne Works, Whyteleafe, l Surrey CR30YD OYD

86 "SlO-SYN" "SLO-SYN" 3-lEAD 3-LEAD Ultra Ultra PRECSON PRECSON SLVANA CENTRFUGAL BLOWER MAGNETC SWTCH SYNCHRONOUS STEPPNG by by Air Control Ltd, Ltd. [B 30 segments ndlvidusuy Now Wow ccmpleif complele with eefaence reference magnttl magnel! i ndividually MOTOR R in magnetically switch. f.p.m. Type glass Silver cts. T SS1S These W case. balanced 2,300 n heavy r.p.m. cast 240 A.C. alloy A magrelically activated switch, vacuum silent 120v. l t fine motors ere B Very powerful slleri sealed runnlnq. Slit dia. inlet easlj/ 24Ov. Size: (approx.) 1"", x t " easily reversed, W running. Ei" dia, 3" nlet normally n closed. a g'ass Rated envelope. 3amp Sliver at l2ehr. contacts, t Jamp revers(> dla. x 2 ~". slarting alarms. starting stco- ' die. Outlet flange 3" * 21". at 24{>v. Sire: (appro*.) long r 3" dla. ping etc. switching n in less lhan than 5 ; LMTED NUMBER ONLY deal for burglar nlarma, security systems! 8 95, P &. P 4Dp. wilhou! alflctricaf PAP <00, s elc,, is required. wherever 10 for non-mechanical 2' ffl: 10; P. A &. P, P. Spswilchlng 15p. 50for ~~th~~chl:~tr~:: or mechanical l '80: l-80; 100 for 15' FREE P. A &. P, P. over 10. braking. braki ng. Slmr-te Simpl e MANS ^ ~ ^ be ha applied to o(ve give DC,,. to wlndlnp relay wlndl~~~~r for circuit a ~ir~~i!im~~~ maximum can SOLENOD SOLENOD holding torque Of of 300oj/ln 300oz/ln with 35w 35v at 00' 35 omps <mps This ftfte little unit gives AMPEX 7-5v. 7 5v. D.C. MOTOR through ZOr.. ~%~~gs'6tf~ 50Hz. winding..ng!:!~d~rr:~a~~~hc:.~~~~~~ Speed For 60 rpm AC. at (synchronous) WKz 72 rpm. operation. STEPPNG, at vertical ~ie~t~~~~~ ~!:~~: malsty (1 f~ 1" of aoproxi- " of ~~ through ~~~~ih i Jr^Sr ~ f " ^ An ultra precision tape motor designed for the per second-100 ezlin. toe bo fae Holding be wired torque to glva at give steps or 200 oer steps second 100 per revolution Ot/in. vnln Can hinged "e b o w". designed whn fixing arm, portable accuracy of 0*1^ 0.1 per 0 slep step non-cumufative. non-cumulative. Torque Bracket ncorporates 2 fining screws. Length of arm. per Sable lor recorder. use n tho Torque AG20 TorQue 2^" '. A coli is approximately lib. 450GM/ load 5OOma. 60ma characteristics can be modified by simple R R.e C.. FREE 240V P. A AC. &. P, P. Special Pull at quotes coll s for aporoklmalflly guanihfes. fib ma. 4S«GM/CM. Draws Stall 6Cma loan on run. at Quantlties. ClrcullS. Dimensions: dift. 4". body length 4>", soiniie 60Cfpm 600rpm adjustment. snglh ntu nal suppression. f~~~~~t~}ii:'~.~13{'.~ W x A" dla. : Weight.t:.. gt;' 6^ m6~ lbs,.. BRAND ~~t1~b'~~~di~ NEW in -S-O-L-E-N-O--D-S jJr nternal ± AF/RF speed SuppieEElon. adjuatmert, maker's die. x spindle. packing- packing. OPered Offered at less than { t maker's price. SOLENODS OUR dia. x ~ ". Orlginelcost OUR PRCE ONLY ONLY by WESTOOL dla.!" dla. * 1!\ * 1" Cig aolndlo, na'cost motor 16'50. 3",. OUR PRCE &. NORPLEX 240AC type MM6. Quantity PRCE available. 3 M. P. Mu-metal 4 P. 25p. Mc-metal flbro-glbsa copper-clad laminate. Finest gua'dy 31b. pull, 21" * 1" * enclosure erclosuie available 75a 75p each. epoxy :~~~g~::rn teafn baao. 1~~~r'~~a~ Heal resistant. r~~i!1t~~tt deal il~~le~~r for ~.a~i.~~ P.C-'s li". ~~~;. Travel t~~v~i;:, ". ~»p- ~'p~ FREE P. i &. P. Sixes: Size,: 12"* x 12"! 12": 24"* x 12": 24"*24": x 24": FULL SHEET each. P, A P, top. each.. P. &. P. lop. ~ 43" *37" x <11 (11 sq 'q ft.) Single-sided Cooper Copper with htch- thick- 240AC 240AC type type MM4. MM b. b. pull, Dull. ness of 1/32", 1(32", 3/M". 3/64". 3/32". Also double-sided 1/32". t l':2", li" H" x 11" x t" 1/16", 1/16". 3/32". 1 per sq SQ tt. ft. Cul Cut sixes sizes ( sq. SCl. \Q ft.) 55p. ~ 5p. each. * U" each. P. P. A * 1". &. P. P. top. Travel 10p. Quantity i" 70p Quantity P. i &. P.. Full Sheet 3 8 each. Carr. 1 for tsl 1st sheet discounts: %. plus 2Sd each additional aheet. ward* 23% %. 50 up- SMTHS RNGER-TMER RNGER.TMER.ALL Reliable 15 mlnule minute times, cprlnq spring woitnd wound OPEN FRAME PRCES (concurrent with lime time setting) 15 > x mln 1 nln divisions, aporoxlmately approximately t" between shaded pole betw!en divisions. Panel mounltng mounting with chrome GEARED MOTORS jfc NCLUDE V.A.T. chre me bezel beze3}" 3?" din. d la Sp 1513 P. P. A & P. P. (Dural gear case) KNOWLE.. 28rpm. (U.S.A.) MNATURE 240 (Oural AC,, ooar aarpm. cose) NEW TORQUE.aoprox. W from MCROPHONE CAPSULES HGH overall TORQUE,appro*. alxe: size: Si" 3t' *:t 3i" 3%" x Whilst we welcome official orders (rom established mpedance Departments, is appro*. approx. 200D 2000, ( output 60 or 80 D8 OB at 1 Xc. Kc. 2i" + splndle%" dia. 70. & As used n deaf aids, aids. bugging buq.glng devices,, elc. etc. Slxa S ize (60 23" -f spindle i" dla. as llustrated. 2 P. A P. 30p. companies Educational Departmenta, t s no above. 19rpm. ' 70. & invoice T DB) 08) 7/32" x 5/32" * x i"; t": (80 DB) i" " t, 5/32" 5132" * x i". r : Ex- Similar to above, 19tom. 2 7Q. P. A P. 30p. longer practical to nvoice goods under 5. Therefore, Ex tlorpm 110rpm with pressed steel gear case (similar to above please remit cash with orders below this amount. equipment, alt all tested ' each. P. P. & P. FREE. but slightly smalterj, smoller) Q.. P. & P. 30o. 30p. 31S/ /317, EDGWARE ROAD, LONDON, W2. ELECTRO-TECH COMPONENTS LTD. Tel: e plus 250 each additional sheet. wards 25 %. SMTHS YOUR CAREER in RADO & ELECTRONCS? P Big opporsunities big money await the qualified man Big opportunities big money await the qualified man in every field of Electronics today both today-both in the U.K. throughout the world. We offer the finest home study training for all subjects in radio, television, evision, etc., especially for the CTY & GULDS EXAMS (Technicians' Certifi- Certifi cates); the Grad. Brit..E.R. Exam.; the RADO AMATEUR'S LCENCE; P.M.G. Certificates; the R.T.E.B. Servicing Certificates; etc. Also courses in Tele- Tele vision; Transistors; Radar; Computers; Servo-mech- Servo mech anisms; Mathematics Practical Transistor Radio course with equipment. We have OVER 20 YEARS' experience in leaching teaching radio subjects an unbroken record of exam, exam. successes. We arc are the only privately run British home study College specialising in electronics subjects only. Fullest details will be gladly sent without any obligation. Fullest details will be gladly sent without any obligation. To; Briti.h National Radio & Electronic, School, Dept W.C.2S To: Brit ish Nation':l Radio & Electronic. School. Dept W.C.lS P.O.. Bo* Box 156, 156. ier.er, Jeroey. C.. C.1. P/coic Please jemf send FREE BROCHURE la to NAMt ADDRESS NAME Block ADDRESS Block.., Caps....._ Ple.. e BRTSH NATONAL RADO AND ELECTRONCS SCHOOL ULTRON' COMPONENTS 35 PARK AVENUE. POTTERS BAR, HERTS PARK AVENUE, POmRS BAR, HERTS MAL ORDER ONLY CASH WTH ORDER, OR PHONE US DSCOUNTS: 15% :-15% off oft for % off oft for % oft for % off for 100+ COMPARE THESE PRCES- j Add lop 10p p & p for fo~ j ALL NCLUSVE OF V.A.T. l^ersuvder orders under ,00 ALL TOP BRANDED MAKES. MAKES, AND GUARANTEED DCT43 BCYSS loc 1 12S ; 2K2S07A 18? 2N190S 23p 2X p AC126 13p BOY43 25p 2N p 2N2907A 16p 2N p A0l27 18p BOY58 16p 2N p 2N2925 Up 2N$903 Up AC128 18p BCYfiS Bon p 2N1304 2N p p 2X29Sd ~N2926 3p 9p 2N p ACl S7 12p flf154 Bl'l54 flp 16p 22NlS07 N ? 23p 2JO0M 2N p 2N p AClS8 12p BYG? BV127 11? lip 2N1308 2Nl 27p 2S30M 18? 2N ? 42p 2N406l 12p ADl49 46p M14S0 76p 2N p 2N30:56 44p 2N p RJ480 7Bp 2N130P ADl 61 86p ~lj48 l VH71 2N ? 27? 2X p 2N3302 Up omo t! oo AD}62 Up MJ490 85p 2N1871A 2N1671A 05p 2X p 95. 2?C3«2a 85? 2N352G 83? 80p OC'28 68p AF125 24p XJF:37l MJE371 80p 2 ~1671B 11 2N p OC'29 50p AFl WJE26011M6 2S107JO MJE N2217 2N221i 21? 1 2NWH 21p a.vaflifl eo? 2N3615 ea? 63p p BOl07 lop U MJE2955 JE2Sfi3 f el'oo M 2N2218 2N p p BCl07B 10. MJE3055 M.JE p 65p jnsaao 2fl p 2N ? S. 2X3702 2^ ? 2N ? OC83 20p BC08 lop 5^698 2N N p :.!N OCP71 76p BC 09 lop 2Nli99 30p 2N2257 2N23C3 27; 2N2303 7fis 2 76p 2N3704 BCl09B lip 2N706A lip 2N2360 2N ? 2X3704 S 5703 lop 13. 2N3705 lip 2N3706 R.C.A. BC1l3 l3p 2N708 8p l8p 2K23G9A 2N2369A 16? l6p 2^3707 2N ? lop lop p BC1l4 Up 2N914 18p 2X2411.N p p B01l8 lop 2N916 24p 2N2645 2N p 50p 2N3709 7B Up 2N l!p BOl 3S 18p 2N918 30p 2N ? 70p 2K3712 2S3710 2N3711 Hp lip lip p BC137 16p 2N920 45p 2^ ' ? 85p 2K5730 2N ? 90p l!p BCl53 17p 2N929 18p 21f»04A 2N2904A 45p 2>f37? 2N Ho p 2N961 BC54 17p 66p p 2N31 2NU31 80; 2N ? 22p 2K3773 2N p BC83L lop 1 2S1K 2N1l32 20p 2N2MS 2N2906 Hp 14p 2S379 2N370l p BCY N13CB 2N p 2:f290SA 2N2906A 16; 18p 2K3917 2N ? 26p l!p BZ llz 10, *3 12.C'«.C s TEAC5 TRACS B.C.B. S.C.R. Bridge 6 amp otud stud ? 35p 6C40D BC40D /400 80? 80p _UdeH llodca la 60V diodes 28p p 240!2 40 3C45D BC45D ,30 16/ C A 60DV 48p 15 lfi amp ilud Htud 0C45E BQ4l;E /05 1/06 80? 30p 4A ' OOV Up diodrs diodes 45p S«0D B~OD 150!HO 1/10 S5P 36p 6A 100V 66p AND MANY. MANY, MANY MORE 952

87 SNCLAR CALCULATORS SNCLAR CALCULATORS, ; "l" :, ~~~; 1,~ Sinclair Slncls Sdanllfic ( 2 ( 05) Camhrtdfl* Cambridge Aasemblad Assembled 1S-9S ( 1-55) ( 1 55) Cambridge Memory ( 1 95) FERRANT 2N414 C radio chip wllh dala 20(22p). Also available Xll kit of oxtia extra parts 10 to complata complete a radio l-50 2'50 H3p>. (43p). Send sae for free leaflet. SNCLAR PROJECT 80 AFU (73p> (73p) 740 Z (630) (63p) CBfJi'&SM ZOO Z60 38 (73p) Q16 7'21 (73o) 7 (8Dp) (80p) PZ (63p) P26 ts PZ U 78 {8<lpJ (63pJ -Ahj fllh (840) PZa PZ8 7' (80D) (800) ^ Oecoder 7 75 (840). Trans for 3 85 (5Op). Tonet Decoder Tuner S<84o). ( 1-37). Trana 37). Stereo far 80 PZ W(50p). 1' 62 ( 1 ( 1 37). -37). Project ( 2 80). Project 80S M-05 ( 2 M). 805SQ ( 3 '0). Project 803SQ BO 80 SO SQ Ooad ( 3-103, Quad Decoder Oecoder ( 1 ( ' '8) - B) ECONOMCAL QUADRAPHONCS ntroducing the Napolex QA10 self matrix quadraphonic eelf contained ayntheslzer. metrlx synthesizer. Jual Just feed the outpul output ol of ary any stereo system (ncluding Project 80 or M) 60) nto t hook on 4 speakers to obtain the latest experience n sound. sae lor for traa free leanel in eound. leaflet. Only Send sta ( 1 ( ' '0). -10). SUPERCZ 6watt le power. amp preamd- preamp. With <4 44 page bookiet booklet printed circuit 1 10 (40p). ; 1 \ Cambridge Memory ( t -95) FCRRANTl ZM414 C radio Chip wllh dais 1 «<2Sb). Also avolfabla S sae lor free leaftet. SNCLAfR PROJECT 10 A ECONOMCAL QUADRA PHONCS fntroduclnp tho Napolex OA10 ayelam (ncluding Project 60 or *; eoeakera to obtain the laleal *-* SNCLAR SUPER C12 flwett C powar, 1-80{40p). NEW SNCLAR C20 High power C audio ampllflbr ampllfler f ( 1-05). 05). DELUXE KT FOR THE Ct2 ncludoa all parts tor the printed circuit DELUXE KT FOR THE CZ ncludes all parts for the printed circuit volume, volume. bass treble needed complete base ihe the mono trabia version controls 1-75 ' (27p). naedsd Stereo to model wllh with balance control (44p). C12 C2 POWER KT Supplies 28V O 0 5 B Amos 2-W 2 99 (57p). (570). LOUDSPEAKERS FOR THE C12 S" 8 ohm 1-35 (3Sp), 5" x B" 6 ohm 1-75 (47p}. PRCAMP KTS FOR THE da Type 1 (or magnetic pickups, mice lunar* LOUDSPEAKERS FOR THE C2 5" 8 ohm 1 35 (350). 5" x 8" 8 ohm 1 75 (47p). PREAMP KTS FOR THE C2 Type 1 for magnetic pickups, mics tuners 1 45 (26p). 2'10 (35p). Mono (3Sp). Type model for ceramic {20p). Stereo or crystal model pickup* plckupa. Mono 75p (20p). (200). Stereo (?5p). (25p). SEND SENO SAH 5 AE FOR FREE LEAFLET ON KTS BATTERY BARGANS ELMNATOR i MM y BATTERY ELMNATOR BARGANS The versatile batlery most battery eliminator vereatllo ever of offered. ered, Switched output of3, 41. 4" 6. 6, 7}, t, 09 12V at BOO SOO m ma A (57p>. (570). Other eliminators stocked; stocked:- 250mA; 3 2S0mA:-3 giving way switched $, 6, 7t t model SV 9V 2-50 Z 50 (58p)- (580). 50mA:- 5OmA:- 4iV 4tV (AOp). (40p). 6V 2-40 Z 40 (40p). (400). 9V (4Cp). (40p). HV 7tV cassette typa type (50p). 6V ~SSo~ + 6V Double ~vui'4~8;t(~0~ iV (Mp), + AW. 4?~ 9V + 2!2gBJ 9V 95 2 (50pl, 1:5~.~5 95 (50p). (SOp). 5MmA:- SOOmA:- Heavy duty deluxe model* models 6V 2-7a 2'78 (55p3, (550). 7iV 7tV (55p). (550). 9V 2* (5Sp). (550). S.DECS AND T-DECS S.DECS AND T'DECS~ V M S-DeC S OeC (2tp) (310) * T)lv T,OeC 3 83 (470) (i-dgc T-DeC,, OoC A 3* (Sfp) (47p> J3. Mji/ (Sp) : H-OaC tcoc~7rl~rs:~. 99 Ccarrlera: B 6-99 reip) (81p)... : 16 dll: : plain Sfp p (Sp) L (150) with 8ocket f socket 1-77 (25p) (250) 10 T05: plain olaln 78p (5p). (15p). With Wl1h aocket socket >U (24p>. (24p). Exparlmenl C ~X~~~~~1.9gl:; ~O~5~t5~»P (?ap), guide*; A o 2-40 (45p)i 1-50 E 4-Sl {36P). B l-77(abd>. 1:~6~o' (63pJ. (~3~t77 (39p), SWANLEY ELECTRONCS PO BOX 68, SWANLEY, KENT BPS BR8 BTQ. 8TQ. PlMia Pleaae add tha the *um sum shown n n bracket* bracket. after he the price 1o to coyer cover the coet cost of poat post new VAT. V A T omclal Official credit order* orders from school* schools elc. etc. welcome. welcome: No VAT cnarped on oversea* order*. No V AT charged on overseas orders. CENTURON CENTURON ^ NSTRUMENT ''MT- CASES Model Nos ! wo part Model Nos two part aluminium construction base front back unit finished in while white gloss, hooded cover finished in blue hammer stove enamel. Mode! Model D W H mm127mm 127mm 89mm 1Mea mm203mm 203mm 76mm 2 00 ea Model Nos. 221F F 222F flat packs. Front & Rear panels aluminium case mild steel front panel finished n in white gloss other parls parts finished in blue hammer stove enamel. hammer stove enamel. 221F 152mm 203m m 152mm 2 SO ea 222F 197mm254mm 153mm 3-40 ea Prices include P 4 P U.K. 152mm203mm152mm 2 80 ea 197mm254mm159mm 3 40 ea Prices include P & P U.K. Add B% 8% V.A.T. U.K. only. Send S.A.E. for full range brochure. Manufactured by Manufactured by Arbour ~thont (fclcctronirs (~lcdtonir5 Cimitrii limitcb Unit 13 East Hanningfietd Hanningfield nd. Est. Nr. Chetmsford, Chelmsford, Essex CM3 5BG Tel. Chelmstord Chelmsford (0245) Sheet metal work wiring assembly service available H«SHORT-WAVE H A C SHORT WAVE A.C. kit KTS s WORLD-WDE WORLD WDE RECEPTON / mcul Far toiluf (tirnwr quality. ;t.» "l-a-c." yvar* f<>r r<1mit-watc were ih«- Oriyiol!-'aTllOu.,,; iur (,n'r ;1.-1 yl'al'~ for 8h()rt-'Van~ ~qujl' mcut of quality. "H.A.C." were tht' Origiulll auppllerti SUPlllierH Bhort-'\'ayc Recch'cr Klt.s tilt' anui'.eut of amateur coiistrucl«r. flhorl-wovc eojl!;lructur. 0%cr Jlowfvrr O\"er Kit* 10,000.-ali<rir. for iln- "ati:;n.!(l cu>rtonier» luctikliiic cuhtomers-iuchlllill~ Technical Colleges. Hospitals, Public School", gttala, Tcchnicsl Schools, R.A.V'...R._-\.}. Army, ColtcRv-, Army. llamx, Jlim. H.U1w;. etc RECEVER Complcic Complete kit Wee 1974 "DX" kit-price $4-60 RECEVEE 4 80 tlnd. Onel. p. A ~ i>. p. k.v. V.A.T.h ".A.T.). CuxtciiK-r CU!it.oll~r writes: ",,\u!;tralia. udi:~ anti America *t at loud vcluntc."' " wfjteu: "Anjlratla. \ olumc."-" [ have han' imuimlln OW liranl ami heard ovrr Anicrxa o\'('r ;!00 :JOO xraclonn 8t.ntlOl~ inclu(lllg mmy AllateurH. h" \'c KCeiVcil reccjn!t ;pj lri<dui!lnyr :~~ Q.S.L. many Vfrlikd AboUw*. nrifll'd repf^^ frrnit have tclulrt~-trtjl atl all coniriiciit". eoutlncnts. Au An amazing ajllllzing mic-valwr." OlLe-\ :i1n!r." Thl" Thl~ kit contains genuiue :-;hnrt-wl.lh' cornlloncnt~, drlllccl l»niirni(i, kll contahh tlrllled tlia»«!h. all genidne l'hl.s~lll. vrtjve, "aln~, llccemrlr* rfmo-wwc v-mmact c ll!o!orh~...,lflll fntl full nhtruction!:'. Ready assemhle. unci of l:our:<e. an nstruct lotk)*. tendy to asm.-riilik>. ati«t»{ emrre. as all our products- fully guarantt;ed. Full rnn~c Of *11 of other uur HTV. protlucf" cily S.'V. kit?. kits. linjluillttfr ifuarantvetl. including the thl' laiiniu" l-'rtll fajlllu:< innsl.-l trncv* mn.h'l "K plum" (illustrated above). -\11 order!; despa.t.cher! by ptii-"(»lu8tralctl ftbow). All t»rik rr.ilejp«iehh Send ntlw {or free descriptive catalogue f uf kltn return. kith Bend anti componeial". nw lor fnicilekrliitlvecalxlokue components. Teal TClOt Report Rl'port aralfethje. nnt.llnblt!. EXCTKO EXCTNG COMPETTOH COMPETTON for 8bori-Wavc Short Wan lh;tenert'. Send rit~j,etl cu\,clollc fur dctall ~. llalenenr. Scnil»laiiij.ei{ enm'solic ("f.ftail*. "HeA.C" "H.A.C." SHORT-WAVE SHORT WAVE PRODUCTS PRODUaS P.O.BOX No. 16, EAST CRNSTEAD, GRNSTEAD, SUSSEX RH19 RH9 3SN lsn ambit NTERNATONAL ~ Price Logic Price CT LM S LW LM TEA TBA 810s M Ll T8A TBA 120A/ SS SN 7666OK 76660N CA 3089P/ 3089p/ TDA T CA ua TBA CA 3J23E 3123E MC CA 3090Q CA 3090AQ 3.75 ua 7805UC Transistors ua 7805KC NB NE ~ 0.80 ua BFY ua BC ua BC L 0.14 ua 741CV 7HCV 0.40 BC NE 5608 BF 560B LB NE 561B 3.19 U M NE 5628 MEM 562B NE 56SA 2H 565A N NE 2~ 566V 2H NE 567V TP NE 555V TP CL CL 8038 N CC CO 3.10 ln N LH LM TOKO Coils is f filters tors 4KX 4KHz 455KK2 455KHz Mechanic.il filter ~5 7KHz 455KKz 455KHz Mechanical filter KHz 455KH2 455KHz Coraraic filter KHz 455ERZ 455KHz Ceramic filter KHz 470KHz Ceramic filter KHz 5KHz 470KHz Ceramic filter KK& 200KHz 10.7MHz. Ceramic filter f i uH Choice choke for CA a9E 0.15 quadrature Quadrature coil for CA 3089E 0.30 o. 3G Double quartraiurc quadrature coil 0.55 CA 3090Q *112 38KHz notch filter f i KHz 435KH7. 1st F transformer KHa 455KHz 2pd 2nd F transformer S5KH2 455KHz 3rd F transformer 0.27 LN oscillator coil LW antenna loading coil UW lw osc coll (TBA 651) M=r MW osc coil {CA (CA 3123E) MHz F Transformer mH Choke 0.2? mll 5. lirj Choke *265pF pF plastic variable cap capo Larsen La'sen NE* NEW MOSFET tunerhead. tunerhe.ad. The much awaited new varlcap varicap tunerhead. 7, FM Fit 1185 Ambit?H FM F amplifier deirod.wlth demod.with AFC. cunior tuninp.- meter field strenath stren~th meter outputs. Uses CA 3089E ceramic filter plus TOKO colls.4.35 coils.4.:?!) CA3090AQ decoder kit + MPX filter 5.40 Built & tested 6.60 Catalogue 25p All Prices EXCLUDE VAT. ALL PRCES EXCLUDE VAT. PLEASE Please Ado ADO 81 8% ro TO all ALL u* UK orders. ORDERS, POST Post AND packins PACKNG 15p J7, HGH STREET ESSEX CM14 4RH T...,.,.",.: Tatoehan.: ( J029 TW..: T...: l1li&,.. '.ft. HGH STREET BRENlWOOO BRENTWOOO ESSEX CM4 4RH 953

88 B-PRE-PAK NTRODUCE Sterling Sound Audio Modules ~ ~ 5 ' 62 5' Stereo Decoder, ready for connecting to the F stages of existing FM Radio or Tuner. The very ver' latest 2nd Generation coil-less integrated circuit design, operating on this phase locked loop system, ofiering offering even better stereo separation. LED stereo indicator lights available. SS W r.m.s. R.M.S..G..C. AMP on P.C. Board wllh All com* X? :~::"~~~:rttda:j\~:t'!~om ! 7R po n«nts bui t toilod 3* n M SS.t03-3 ~~;!?~~3 Two l,c,.c, slorao stereo 3.25 f* 7 f C version 3*0*40 These on connnc'lno amps, efe op, supplied sped icnllons with a frea booklet easy lo build projecls. projects. These amps. are supplied with a free booklet t:=======~:d on connecting up, specifications easy to - 5W & 10W low POWER AMPS W SS.15 5W SS.10 low low 2.40 These matchbox size amplifiers have an exceptionally good tone quality for the price. They are only 2i'* 2t" x 1K. t". The 5W amp will run rpm from a 12V car battery making t it very suitable lor for portable voice relnlorcement reinforcement such as public functions. tunctions. Two amplifiers are deal ideal far for stereo. Complete connection details treble, bass, volume balance control circuit diagrams are supplied with each unit. Discounts available for quantity orders. Other Sterling Sound Modules Pre-assembled printed circuit boards 2" x 3" available n stereo only, will fit edge connector. connect,) Stereo Pre-Amp SS is for use with crystal or ceramic cartridges "BO Stereo Pre-Amp SS for use with low output magnetic cartridges. \" ,25 Stereo Tone Control SS.10C acllve tive tone lone control board will give bass treble boost cut. Pots. Pols, extra nstruction leaflet supplied with all units. V VAT at 8% must be added to total value of order. Postage packing-add packing add 15p (U.K, (U.K. orders), To B-PRE PA Bi-PRE-PAK K LTD., 224 S24 W West Road Werlcllflc-on-se" W es tc liffe-on-sea Essex SSO ~DF 8PF.., Please PlcMa send Send SS Modules Name SS,203 SS.203 Slereo Stereo Decoder 5 SS.202.F. Stage (Pre-tuned) 5 1 SS.201 Front end (Variable tuned) 6-1 Stereo Decoder, ready for connecting to the F stages of LED stereo indicator lights available. These matchbox size amplifiers have an exceptionally Discounts available Jor quantity orders. Pre-assembled printed circuit boards 2" x 3' available n enc05e... nc. V.A.T. 1, Address '- _ ':;;' ";;,.":;;,.";;;;,." ~ ' 954 ;;;;;";;;;;' ":;"";J * ELECTRONC piano PANO kit KT * SYNTHESSER wipligsw KT * ELECTRONC / \ ORGAN KTS J \ There are pee five superb Elec* Electronic Organ kits specially f / ',1 ronic designed for the D-l-Y 0-1- Y en- thusiast. With the extreme flexibility fiexibility allowed n in design. ' thuslasl. you can build an organ lo to your requlrernenls, requirements. a which will compare with an organ commercially built costing double the price, price. yrportable *Portable organ with 4 octave keyboard, *r * Console organ with 5 octave keyboard. keyboard, ' 90. * Console organ with 2x42 x 4 octave keyboards 13 note pedal board ' * Console organ with 2x52 x 5 octave keyboards 32 note pedal board * Console organ with 3x53 x 5 octave keyboards 32 note pedal board * W/W Sound Synthesiser Kit. Kt * W/W Touch Sensitive Electronic ElectroniC Piano All components can be purchased separately, i.e., semi- semi conductor devices. M.O.S. master oscillators, colls, coils, keyboards, pedal boards, stop tabs, draw bars, key-contacts, etc. Send 50p for catalogue which includes 5 x lop vouchers or send your own parts list, enclosing S.A.E.for quotation. ELVNS ELVMS ELECTRONC MUSCAL NSTRUMENTS ELECTRONC MUSCAL NSTRUMENTS Designers component suppliers to the musical ndustry industry 12 Brett Road, Hackney, London, Ea 1JP. Tel Brett Road, Hackney, London, E8 UP. Tel Tele-Tennis TeSe-Tennis As described in Practical Wireless Play the game that's sweeping the nation. You've seen it in pubs, clubs arcades arcades now you can play it in the comfort of your own home. Plugs into the aerial of your U.H.F. 625 Black & White or Colour television. No internal connections to your T.V. set. Does not interfere with other T.V. programmes. Built from 6 neat sub-sections, purchase a complete kit or sub-section at a time. All parts available separately including P. C C.. boards, case ready punched slotted facia panel. S.A.E. for full details. DABAR ELECTRONC PRODUCTS ~ 98 LlCHFELD UCHFEUD STREET ~ ^ WALSALL, WAUSALL, Staffs WS UZ 1~' ~

89 rnrnrnrn[u]ffi~rn[(mrn electronics Oepl S. ffane Ori S Grew Green Road. final Uwtat. London. N103HS NO 3HN. lelephone fi»«f,.. kr>op-yi W'lClp-)f plpi'tt ploulc rfolopr,,101..., 0.125" /1 1,. Y/* 0.2/11'. R \VL209 Tll" "6 1 t/ie\ MllSl_1 MUDtSt tin OBBffl Znifen litronix Our Speciel Sp«:l»j Our Spece Specie! fill.h U_ Unaal Peck PKk \JU81 Uual Peck Pee* price prece Prce Price price Price Pries (J to RED 7.99 is f. $ P 3 (J to GREEN &J.H LJ." Anodt CeiKodr C&'"'"w CXvH tlu lo" Dl l Dl n.7 (J,,, 0.3" o. 3~ Klgl. D1 hog!. <Sfl,g 707 DL 74? C "' g OC ~ 1 0.6" high,6"" S." c h o'ct'~, M WAN MAN 72 WAN MAN 7* 74 WAN MA N p:^ pi" Da C 0.4* l-lpl* to YELLOW 7.99 %_ 5.99 Oil l.n- l.h. Dte* D~t P,. to (J WHTE s J fjr~~" dfttn WAN MAN 52 MAN a 54 MAN MANS) 53 Dl lo Dl746 (J to ORANGE L 3.10 J. f(j S' " ~ 1 (!. 1) '.llow yellow WAN0? MAN 82 MAN U.. MH MANe] B3 Commo" Anodt' Common Anodt' l/h L/H H'H Ccev** Anoit ~' H R"dO.. ly R"d Only 0«e. Dec. ft. Pt, Dtt. Dec. ft. Krd Olr Co '-of Apedr 4 Crly Pt. f(j RED (JU' ""CE S 10175'.v:~'l- P:f 1,1'» OUK WCl 'fle-f 1092 tut\ P*$ M ima* f.c.s,,, 7* semes SERES in TTl W (Sp^d.p) iw 709 ao-wi (l0-99 ) a?>fl SL414 '(lcl slocl (l,"'! ",. GRADE BANDED PlODUCTS M)9 709 fupcniilpt (1 4 pin d ip ) M^p Back in stock again! CCADC B*ND 0 «C»UCTS Sl" l~?o^aplndlp> SLUO p in d ip) Wip 7400 ~ SN 7~9 1 ' 4<2 90p 7to 710 ao-w (loo 99) 39jp HC244R 7* 74'"... SN15492 ~ 710 (14 pin dip) Tht' S,abililed Po...'r "0' 74< ' 7!CMU pfarflpt 30^ '401 1% 744? 74««wpply 711 (lo-w) TAA263 80, '402 ~ '4<' 7492 BOp JJ no-«j «Jp! «Sio6l"red 7B»»J mpply 74C? 7445 >.» 7*9) pin dip) [.as; TAA300 [1.76 (01... ich d,,,,on... cry,.. c... ch vpply ' 403 ~ 7"7;" 1.76 "93 70p 7*1 lit plr H>p} 38 Jp fof ck Ofof* ol'tyi uzflr 74C3»» 7a ? _ 1.47 nl (TO- ) 54p TA A3 10 [ ) 9H. ~ T-tisK»4 "" itchtd }. 3. A J A & 9 vpt'i "'0111 vp vp i; 10 4CO 400 ma B 7447A 1.7* 7*93 """ p 114 pill d ) 2,'5 TAAJ20... 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VC.1JS TaA560C [2.92 AY ,4,5 MC1J~ [1.65 TBA 62SA 1.03 AV MC 1)75 [ 1.38 TaA6 2S MC 1456(0 [ U A625C 1.03 MCl'58(P 0.37 T6A6S 1.62 ' Chaui,. 9 *ol... oh. T'-'r AY S.«~i -, i~f,-, >. c,- o " o,.,otion.. \ Al0055 \.a~.,.-.y... c 'J " C u '-' r».=; 1 ' 8,004 ~.."", lhaooo:t 3.87 MC 468G [ 2.47 TBABOO MC U.54 TBA810S CUO U..JUD C»V$TAl C YS TAL OSPLAY DS'LAY c_plet, -FrX... th 0."". 93_ /ok G [1. 6 T8AB lqas ictfcfl ~clce ' olld r.l?o... obl,,.f' Cli"" bqcu"'o; ''''3065 ( 1.53 MC3J02.30 TBAB20 N.- N... MM Mi"f F.M., r^». Tun" «>AN4F]?fl cs4 r» o.ob1a le' AN"371t LJ- 13",..., rkcaric. cholocl" >)*3pKi. iocl"-v. h,;ght. Co* CO" (AlOn 1.62 MCl »T voll tvpelf vpply tr bt' dirt'tll, 4ri«io dri",." b/ by Nqi NotlOf'lol torsi Sa^lcondvc'o S,,,,lcondvcto,, CAJOB [1.61 [ Alo"" C'ofV Clot" t^p chip WMS3A. MMS316. ( [1.62 Molch irog St.,.o o.cod.r»o i-ajc** A COS M 'B'tO Ovsodef UM ".86 OUR (JU RRfCC ""CE ~J." LOOSTl 1.45 L036Tl 1.45 LOJn l tl.39 L1JO W301 (TO 99) 59p im»t rflp.vadrpi 52p LMJOl no-99) 5" LMJO (8 pin dipl 52_ UMJ07 LMJ07 rro-99) 5" JA307 lmlo7 <0 rro-99! 18 pi pi,., A clip) 59p di p) $?D 52_ LAOMHflO-Wl lmj08h(to- 99) t1,26j [ 1.26~ LM309 lmjob B /8 pin pi" dtpl dipl 97p 97_ A009A lm309k 2.36 lmj39 ( MJ LMJ39 13.MJ lmj AO ljou LAO ljou MfC"""," WC4C60A MFCOOJOA MFCb040 MNS314 MM5116 MVs-t WNll'N MVllW NU40 NES55 NE5S6 NES60B NE561B NE5628 NE565 NE568 NE ~ i~:i~ 40p TOA40S 76 p ~g::::~ B ~p ULN 2111A 1.00 ln402 ZN"" k HOUR DESPATCH (1. 17 r--==:---'--=;"":=---='::"":::""::""; DESP,,\T 11 NOW frj " " ' 15 2<19 [f lit lllst Depi 1. ' tekptm i/c/ir emmc omes N OPERATON AT WEMMMMESL 3Y2 DUDE DGT V(JLTMETER NTEGRTED C"UT LAST ri-l rr" 7>!» Th i"'gt,"of 'i-r-ont^e-cn,h'"ort MOS LS ls tup chi p coip'rt con'oinj oil olllh, logic ",c.uory for 0 3l d,code, dvol %!opa <>* lopl' ilayofinp, lopte AOtraarr i""9ro1i"9. ev's^s'ie w a 3j ovtomot /c Bp1«<r*r dioedr. polo,lt." io'tt'ltq d^al dlllct ing W«W, ran con AO "0... iupo'r lupply 111 he ewrpl«l»»o( complete,.t ol of.cu 'J fo' DVM for, Svppli.d... th f,,, dolo onl ci,cvit hp the. Fwll Full dfltc logic vo^fan ve"lon of o( *1 the C9S CBS SQ sa Daeo*'. booo.t, 5.PC- Decad.,. booklet AY-3 r.i S - -A 3507 «r,, <f«'e >-<r C i«^» n* rh, Mrsih MC1312 : Menu MC13 1" amchis. & MC3S. uih- Unde, ess C8S llcenclnp liuncl"" PTpAQBUflui 0"0"13""11'"" iheir th... CoA con oil/ only ba b. wld!old pi 01 0 ktl kil refvi'v* ndull... e Of of OlMCfaUd ol!ocioted COXpOASdli. OUR CO""POllllnll. (JU RRCe ""CE OHiy (JNl'l 7.94 ~1."1 9l»w Plegle oik ask lot for rtr rree p<lt«price ll»t. li,t. PHOTO-DARUHCON!bookl,t, 010(l02Op1 SPECA. Cl=l=l Ul' KoA«Ofctmol Fo!r«' A" C<FTy*pn A nod Ch«'B(l>< Halglil 0 3' RCD ( l«d Led 77) 1 'E' MfH/TROH EEN 18) 9 for 5.99 CRiCH { Led B 5 for 795 yeuow,eu(jw i Led 211 _/ ) 6 for 8.93 NEW ""Cl ~1.l4 1'.'1' ~Tf"l (J)~) 1'.'1' ()Ol OVERSEAS CUSTOMERS OEDUCT 2-'27 VAT.. M.1".J Ll.. lhil).. AT «0 / OVERSEAS CUSTOMERS DEDUCT.. (J/o 4 vat VAT invoices NVOCES on ON request REQUEST?iP pap Or On UK o^er^. O,del... m<r nlln 5p 1Sp " Diod. - lu,..d Fronl 'End F M.. F. Amplifie, Stereo Multipl D"od,r Thi, '''0 mak. 0l1li of h.!oolt lobvlo..., F. M v... " oll,i_. Typicol (h.-..., MpgrQ :orr 50 db. CALLERS WELCOME 955

90 1 Marshalls A. M."sil"11 & Son (London) Limited Ocpt. PW /Vlarshall's A. Macshall 4 Son (London) Limited Dept. PW «Cfiekle\voocl 42CClchil'wood Broadway London NW?3HD NW:' 3HO Tel: tBt 4,~85 85 Wosl WC'st Regent Slrcol Strp"t Glasgow Gliisoow G22 0D 00 Tel;CMl-332 Tel: Everything you need lsinournew1975 is new catalogue. Available now price 2Sp 25p Trade export enquiries welcome wet PW TELE TENNS Aa A featured in PRACTCAL WRELESS )uly July - November Alio Allo on BBC Nationwide in the Dally Daily Mail October 2nd 1» Thi«This exciti"c is available (orm. to popular dem we ire exeltlne are now able newaame ta to ahtr * now offer a-fancisiic availablo a~ fantutic uvinz n kit saving oil nrrn.' on "jise Due :list prices. (o pooular pr-iccs, deal iimo derr lame for (or whole just pluls Parts Paru list family. is as follows: No need to modify your TV set, jusc plugs in to aerial socket. A Resistor Pack -00 1,00 p.p. lop B Potentiomeiei* Potentiometer Pack i 1 'S 15 p.p. 20p C Capacitor Pack 3. D Semiconductor Pack L4'5tl i 10 p.p. 20p,,4 ' 50 E C Sockets p.p. p.p. 20p 20p F Transformer p.p. 25p lsp G PCB's PCB', 7-5& p.p. 70p H Switches SO p.p. 20p UHF Hodulator Modulator Kit T> p.p. 20p Special Prices complete Prices-complete kit (excludinf (excludinl case) p.p. 50p SOp Sections A-F A F ncl- incl di m'50 50 plus 30p. Assembly tnscroetion* instructions with complete cclmplete kit ol of 75p on repueic- request SN7400 sn7400 6p 16p 5N7420 sn7410 6p 16p SN7453 sn74s3 fip 16p SN7491 sn '10 10 SN7401 sn p sn p sn7492 SN740AN sn740lan 3Bp 4p SN p SN7425 sn p 37p SN7460 SN7454 sn7460 6p fip 16p 5N7493 SN7492 sn p 75p SN7402 sn s 16p SN7427 sn p 4$p SN7470 sn p 5N7494 sn p SN p sn p sn74:r2 38p sn749s SN7404 sn p 6p 14p SN7432 SN7430 sn p J6p SN7472 SN74'3 sn p 30p SN7496 SN7495 sn p SN740S sn740s 14p sn7437 SN74'14 48p sn , SN p 4Sp SN7437 SN p sn p SN7474 SN7475 sn747s 50p 4ap 5Vp 5N7407 SN74fQ sn p SN740? sn p 4Sp SN7440 sn7440 6p 16p SN74;6 SN p SN748 SN74118"' SN7408 sn p lsp SN744 sn d SN7430 sn p SN749 sn74119 ljm 1 ' 91 SN7409 sn p SN7442 sn p SN748r sn SN7421; SN p SN740 sn p sn7445 1'59 sn7482 sn p SN741 sn7411 5p 6p SN p SN7446 '59 sn ,00 00 SN7483 SN7482 sn7463 Cl-10 87p SN7422 1'20 SN7423 sn74123 np 0Op SN742 sn p 18p SN7447 sn " 30 5N74e4 sn p SN7441 sn SN743 sn7413 Mo SOp SN7446 sn 'SO 5N74e5 SN7465 l-m 1'58 SN74S0 SN '44 SN746 SN p SN7450 sn7450 6p 16p SN7486 sn p SN7490 sn '95 SN74i7 sn7417 aop 30p SN745 sn745t 6p 16p SN7490 sn p TRY OUR NEW GLASGOW SHOP o( Post Prices correct Package at October 20p 1974, but all exclusive of V.A.T. lop postage package charges charles Popular Semi-conductor* Popular Semi-conductor. 2N696 22pi2N3707 2N3707 3p p AD42 AOl42 59p 3C309 SC309 lop.lm709 48p 2N$97 2N697 16p 2N3706 2N p AD AOl p 8C327 ac lip p T099 38p 2N p 2N3715 'SO AOl61 4Sp BC32B 19p BOL Up 2N699 P 2N37(S 1-50 AD6 ac320 4Sp 45p 2N376 2N3716 Cl 1 80 '80 AD AOl p BCY70 Vp 8DEL 33p 17p 140lL 2N302 l9p2n377r 19p2N '10AO61\pr AD 161 \ t BCY7 BCY71 22p 7p 22pLM723C LM723C NOL 40p 90p 2N3f)3 2N303 19p 19p2N3772 C 1'80AO61J '05BCY72-80ADl62/< ecr72 Hp 13pLM741 UM74 2N304 2N p 24plN3773 2N ' 65AF09R AF109R 40pBOl23 BD23 32p 31p T099 40p 2N13DS 2N305 24p 14plN381937pAFs 2K389 37pAFfS 14pOB F 40p SOL 80lL 40p 2N} 2N Jlp 31p2N3820 2N3B20 38p 38pAF24 AF24 30pBO p SOp MOL 140lL JBp 38p 2N307 22p2N '41AF15 42 AF pBOl35 0D35 41pLM747 42p LM N308 2Sp 25p 2N p 17p AF26 18P 3D BO' p LM780S LM7B05 2,00 2N309 ln309 36p 36p2N390S 24pAFl37 14p AF17 18p fldl37 BOl37 55p MC310 2'91 2N N pAF39 39p,BOl38 63p KC pMJ460 M p 2N(67i N pAF39 60)30 2Nlfi7A -54 2N pAF70 BD39 7lpH40l 2N67B ~~:m~ -722N426 ~::~~~m~ 2N426 20p g~~m~ AF 179 ~~~ ~8m 67p ~~~~l~!: 49C ~: 98p 2Nlfi7lC 1671 C 4 ' 312N N42B9 34pAF S8p,BFS BF5 25p MJ N202 50p2N492t 2N pAF239 BF6 23p 2N247 ~~m9 JBp ra~~~~lli ~~~m~ ~~ ; ~~::~ ~~~~l~i~5 14~~ 2N2l4e 94p 2N4923 2N4922 e3p 04p AJ AF240 2N260 : BFM7 43p 340 E295S p 279 BF S4 16p E30SS 68p ~~~::g 60 :~~ p 2?45190 ~~m~ 91p ~~~ AF280 ~m~ ~:~ BF163 ~m1 32p ~~~ ~~E~gggOB ~~ 2N2218A 2N221BA 22p2N5l9l 2N pSCl07 BC07 16p BFt80 BFBO 35p MFC40 M C4000B MFC4010A OA 49p 40 P 2N229 2N p 14p 2N5(92 2N BC09 BC08 15p BF BFB MFC p 2N229A 2N2219A 26a2NS195 16p 2N SCr09 BC09 19p BF 181 BFB p 34p MFC4O60 Mp MFC p 2N222( 8p 18p 2N 2N Jp 43p 8C(47 BC47 p BF BF94 (94 2p p NES55V KFC NE555V 70p p 2N222A 2N211A 2lp lip 2N pSC 49 BC4B p BF BF lip p NES6CD NES N2222 2N p 10p2NS4sB 2N pBC 49 BC49 p BF BF l3pnes3l Up NES31 4'48 '2N2222A 25p 15p 2N p 13p 5p NE565A '48 2N2646 P BC67B BF97 5p NES65A SP 55p flp 4Bp BC69B BC68B 13p BF BF9B p OC2B 2N2904 Up p pBCl6eC SOp 16BC 11 p BF200 40p Bp OC28 OC42 Mp 76p SOp 2N2904A 24p 14p B8p 131' OC71 17p 2N290S P BC69B BF237 22p OC7 7p 2N2905 4p 14p p 6C69C BC69C Jp BF236 BF23B 22p OC72 15p 2N290SA 2N2905A 26p 16p p p DC BC p 0FX29 BFX29 30p SL414A sl414a '80 2N p B 50p8Cie2L SOp BC82L ll' BFX30 17p N2906A lip BCB3 ll' BFXs.! 14p TBABOO 'SO 2N p p BC83 BFX64 27p TAA N p 51p BCB3L ll' BFXB5. 30p TBABO ' 2N2907A 24pM04 { P p S2p BC63L 8FX05.3OpTeA0O 24 P TBA0OO M 2 15 BCB4 Up BFX87 BFXB7 18p 49p 2N p p BC84L B4L Up BFX68 20p BFX8B 25p TP29A 15p TfP30A TP30A 58p 49 p $8p 2N3053 2N30s3 56p BC211K 161' TP31A 61p 2N30S4 25p S6pBC2l2K BFXB9 ln p ' 00 BC22L BC212L 16p BFY9 45pTlP3lA 62p 61p TlP32a TP32B 74p 62p 2N3035 2NJOs5 AC17 lop BC214L 11,. BFY51 13p TP3JA ' 2N344 75pAC(t7 20p 3C214L BFY5 N344 97p AC AC lop p SC237 BC ' BFY52 23pTiP33A 21 lip p TP34A '51 2N '69 AC(27 AC27 20p lop ac238 BC23B p 6FY90 BFY90 75p TP35A 2 2' N345 2N341S Dp lop U P AC AC2B 128 O 20p ivp lop SC239 BC239 Up TP36A 3'70 2N346 2N3416 SpAClSlV 15p AC51V 25c 15p BC ' Cl BRY39 C pTiP36A 65p Tl TP41A p 2N347 2NJ lip ACS2V AC52V 7p 17p 6C258 BC25B ll' CA3020A -0OT(P42A 1'80 TP4lA 2N p AC53K 153K 2Sp 15p BC ' CA p TP p 'V3p 93 D 2N3703 2p p AC p 18p BC ' CA3043 CA3046 2'J 2, 11 TP305S TP3055 «p 60p 2N3704 4p 14p AC76K 25pBC30( 15p BC301 34" CA3069E CA3089E 'V6 ZTX300 13p 2N3705 2N370S 12 p p AC AC87K 187 K 23p BC307 ll' CA ZTX 77X300 ZTX Up lop p 2N3706 9p AC88K AC8BK 34 34p P ac309 BC30B lplm30la LM301A 46p 2TX500 ZTX500 5p TRANSFORMERS SAFETY MANS SOLATNG TRANSFORMERS Prr. 120/240 V S*c. 120/240 V Cantra Tappad Screanad SAFETY MANS SOLATNG TRANSFORMERS Prr V Sec. 110/140 V Centre Tapped Scr ned Ref. VA Wei.ht Size cm. P & p No. (Wom) b 0% p B x 6 0 Ox 6-0 6' P x 7 7 " B * 9 9 x x ' * x 93x x ' J x110 x 11 8 x10-2 x S x 14 0 x 10-8x 10 8 x ' J E 14 14'Ox Ox 3-4X 13'4x ' C l7-2x 17 2x x x *65 B' O B x16-6x x 16 6 x '0 26' J5O x13-4 '6 x 13'4 x10-1 x 18'1 30' ' ( CC x15-3x '6 x 15'3 x 18' AUTO TRANSFORMERS Ref. Wei,hl AufO TcUu P&P No. (VVcctx) VA Weifht (Watu) lb b ot Size cm. Autc r a p. 0% PiP P x 5 1 4' '~ S 8 7'4x x » 1' SO * S O x 9 66 x l * 12 lxll 2x x10 2 ^ C B x13-4x x 13 4 x l x15-9x14-3 x 15 9 x a O 17-2x166x140 17'1 x 16 6 x 14 0 ^ x x13-4x18 l'4x B CASED AUTO TRANSFORMERS ~~~Am ~~s5~e:~ i88:tloog~as ~5~9ri~i:B~R~t 20VA 2'85 pp lbp 15V mains load input U.S.A. 2-pin outlets. 2CVA 2-65 pp 38p 50OVA 9-50 pp BOp O0OVA via B.R.S. TRANSFORMERS PRMARY VOLTS AND OR J< VOLT RANGE ~RMARY VOLTS 11 AND OR 14 VOLT RANGE Aef. Ref. Amps. Amp.. Weifht Wei.hl Size cm. Secordory Secondary Windmfa Wind;n.. P i & r p No. 12V 24V lt>oj b o. 9 P '25 "'8x 2 9x J'5 0 12VatO 25Ax l 211/'00' ' 1 * x x s e* x a V 012V 0 12VatO 5Ax2 ato at 0 5A 25Ax2 x '$ lc 'Ox 0 6 4x 6 4* V 0'12Vat at A Axl x a'3" x V 0'12V at 2A la *2,,2 1' J 3 a 8 9x 0-9 8'Ox 0* 7'70' Vat3Ax2 at 3Ax e x 8 9x 6 9 * Vat4Ax V at 4A *2 4-lS x x 6 8 a 60 Vat5Ax2 0-12V at SA x 2 4' l x J 10'2x 0-2 x a 60 lvat5axl Vat 5Ax * 9 9x V 0 12VataAx2 at 8A x ' 'Ox x O Vat 12V at 10A OAx2 9' J S 'Ox ' V O lvat at 15A 15Axl x '19 8S lo x5 3x Vat30Ax x 15 3 x V at 30A * * VOLT RANGE Rtf. A.,. Arnp». Amps. Wialffit Wei.ht Size cm. Secondary Seccndcry Top* T Gp, P Si & P p No. b lb ox oz P 112 OS X 5-flx V 1' 'Ox 70 x x e9x x 77 7'7 '" x ] 18 ] * * ' x 9-6 9'6 98 ' l 51 5' x , B * BB D 0 12 lxll ax x ' x 10-2x x , J VOLT RANGE Ref, A.'. Amp«. Amps. Wei.hl Weight Size cm. Secondary Secondory Tap* Tap., p P Si " P p No. if> b e* 0' c t> S '4 x g.l v U V ) 10l x * * x x 08'6,, 4' S x10-2* x 10 2" l ' * 10 5* ' 'Ox 14 0 x 10 10'2x 2 x 'Ox 14 Ox x 7* ' x 12-7* 12 7 x VOLT RANGE Rtf. A.,. Amps. Amp*. Weight Wei.ht S/ze Size cm- cm. Secondary Stcondory Tcpt Top. P S.P & p No. b lb oz 0. P x 70 x 67* 6 7x C-4C S ' x 9* 777 7x ' x M,, l'o )( s.! '00 l * x ll-b a x 'Ox 14 Ox O-2x 10'2x a 0 ' B 14'Oxll'lxll'8 14 Ox 12-1 x CO C!) * x 14-7x 14 7 x * x » x it " x 17 2x 14 14'Ox 0x * MNATURE TRANSFORMERS WTH SCREENSPiP P '" P ftcf. A.,. MA. Wciffbc We;.ht VOLTS x2-6x2-0 Size cm 2 8,a 6x VO LT5 3-0-l p 212 A la A la 6-1x5-6x4-8 6 lx5 8x x2 6,a 9 3 9x2-6x U x2 9x , x2-9*3 6-1x5-4* lx5 4x4 8 C lo 208 A. la. A la 12 7 Ox6 4,,6 1 0x6-4x , l'oo *2-9* x2 9x , loo. 300 loo 4 6-1x5-8x4 6. 8x'" , (OX.) (O.C.) C*6 1x6 7 Ox6 lx A. la. A la x7-7x7-0 8'3,,7' 7x7' , l 'lx7'Ox7' , J A. la. A x7 0x J la 3 4 B 8 9x7 7x7 7 9*7-7x Ccrr/ece Corr;a,e via 685 8RS PLEASE ADD 8% FOR V.A.T. NCLUDNG P. P. G P. ~ BAKKE BARRE elecronics electronics 3,THE MNORES, LONDON EC3N 1BJ TELEPHONE. TELEPHONE: /8 NEAREST TUBE STATONS ALDGATE ALOGATE S & LVERPOOL ST 956

91 Practical Wireless Classified Advertisements The pre-paid rate for classified advertisements is 12p ]2p per word (minimum 12 words), box number 30p extra. Semi-displayed setting per single column inch. All cheques, postal ordcrs, orders, ctc., etc.. to be made payable to PRACTCAL WRELESS crossed "Lloyds Bank Ltd." Treasury notes should always be sent regisicrecl registered post. Advertisements, together with remittance, should be sent to the Classified Classificd Ad- Advertiscment vertisement Manager, PRACTCAL WRELESS, PC PG Magazines Ltd. Fleetway House, Farringdon Street, London, EC4A 4AD for insertion in the next available issue. issuc. Receivers Components CRATA F.M. TUNER CRATA F.M. TUNER Pack 1. Resistors 36p 3Sp 2. Capacitors Somi Semi Conductors 5, nductors 4 & fiiters filters S. 5. Chassis 4 & hardware /7.. A.M. Parts 3-65 ' TEXAN W AMP. TEXAN W AMP. Pack 1. Resistors SOp eop 2/3.. Capacitors 3-65,65 5. Switches Potentiometers Semi Conductors '25 8. T Transformer ranslormer '95 9. Printed Circuit ' Chassis 3-00 ' 11.. Cables rap 4Gp V.A.T. EXTRA add 20p 201' p/p 'l l' etc. except transformer <35p) (35p) S.A.H. S.A.E. for lists TELERADO TELERA.DO ELECTRONCS, 32S Fore Street, Edmonton, Edmont'ln, London N!) N9 OPE Closed Thursdays 'W TKN-NS CSTS. 'osl fiw inclusive. 'W TENNS lots. Pos t fre" inclusive. Scmitomiu.aoi-s. S<'nliconducto'"S, tlll-ts. f 2 7S. SorUots So<.'l,ets t'o-so Ortior Onler' hotli, hoth, CJtl- Hi. sl lslillh Devices, P<> PO Uox Box. J 1, Mai-jj.-ite. lvlarg <lte. Kent. ALLARD ELECTRONCS Draoded Bred Component* Full C o mponents-full Spoctflcation Specific3tion TRANSSTORS sew, Price oa, SCJCs DODES ca. A'T-'.-.H:;*.'\ : '.!;"Jjl i/7/k o O'la 'd 'rlcc l' ricc ea,; ell. Prico en. t..:hh l ju;i o ao 1~ f1j /X 1l4 '.~ :\ /.:! tins C ll:-l / r» lfj O 0-50 o-ao ln0t4/lx4ns?rtcc ra AHl'ti/i'fj \lllil/l":! oari 0':.15 t'lisi/'jn ens!!'.!/ a O lio GO : S l~ flot/s flo/h 0-00 U-Q / F P/li/7 0 ]1 \ :t :-i l / lo 0 45 AM ft '''' ~ 0'35 85 citsimu ''RSX/Jn : 1::-:':(/ PW TV TENNS (A SEMCON PACK l" 47/K/ll "?W. : ~~; : ~ ; H~~; : g : ~~ SPKCiAL SEmcon pack SP~:CA L iu'isv/:/.i ~-i -lh;. :!.-Bt'LOH. "" ' ""/~/ " oio 1/C 0.10 C OFio'ER JU^fLW t- i\"40{l-l. J-i!{05 H c"': :.! ;~l- l o n m OFFER u-in 2-741L'. COMPLETE 11 J :;~~~a:'\ l ~ -:-C R(:yjft;7i/7L0iU JJn.lin 'Mir»-J 2-l5i-lrw 1 U-NESSn. \4fHl4. l-7f<05 EJJ:;. n C '~i fj/ il/i:! iiin;n/i;tj Ui-i loo.'.! H ~! U n 0 3a :H/l:l:! 35 ':,~ ":~6o SPEUlAL 'H tj l ~ ni'mfsw H'!.'jJ/fi oio THAftOO RN-U, d.74(111,24-1 N!H pair ;1.; k nry.'.n^i/rijo BFniOj;"j llt):! 0'16 )6 E2 15 M r ai'kclal FHEE.PA1';\ MVl-JT UY!:! KK - HATA per mi;k J'ltllli; :;ith: h' FULL UJKHTO.''-1 E;rill 0 sliikly PCLL RANGE 02 7.N. 1:10 O\': r 1.;'00 '1:li Md ~t.1 K37 E:Ji l ';3 Tit zs 'J' B:\ A Ei T-8S -ia 1,35 "Mlidirutur Over 1.5 Fi-rni- ("o)lo1l1l:tur t~ l l"s. :!:-.;":.!:.! -; 0-19 ~==_-,! SN S~i !O jmrl.-rf lyinn, $C ril. H nt at 'JN2!Kir. '".!S1!t()li 0J ZENERS ZENERS low J>ri ec~. Ve roit\wdnll :!i\":.!!l:.!/i all Oil 0-11 lizvss j;7.y,~'" nit l"» }>rk'ej. Vrnhall h"ard. pot!". 1:111'... 'jnnfm;; :!;\":~flr.:; \ o l!:a ~~.-,.'l 0 10 H.,.. (' k. U'NSon.l :!.;o.;:!!;"i-l Vill vtdr.v'fo 10 i-'.r., wkim. rtu. pot-, irmw, 1:7..\ ; 1 -i-riuf.: eri ('....')c'! f llr F){ EE 8\:irir>;. :!\';W:'i;"j i:<w ':!w d*»'l Ld.fi.A.L r.ir Fit list. S.A.}:. 11lea-v. EK " P:)/lc. '.!.~;lio:.!/:; 1 o-id 0'10 2Srt70.V'l :!N:liO;i/lj O-JO BRDGE 0,10 RECTFERS 2X;ij07/f/:i pril:t! e;u.:h '..!:\:lioi/i:ij:1 oos O' OB A 2A 4 A! A p.i.,'. 1,\ '2:\. ~A '".!N:,~ J~ 0 28 :jll\' () ~n O :lo 0 45 '1'1J.'.! (:!' r','d tjlh' ) '.!O o ;~~ 0,.1$ (' ] '2~") 0 20 '200,' 11':!5 {1 lh 0 ;'.4 L' ACK (W tolh " '.i:~ n lio 'J'E!S 1 75 r,nj,' n,'.!;j 1) -l5 n io LONDON 799,^01 BALLAHDS Nil BNP LANE l)-lib 0 7;) U R7 299/301 BALLARDS LANE LONDON N2 8NP MAll Order* MAL Orders under ORDER undc.r 3 3 plus ONLY. plus 5p 15p P& Cash with order P & P. P. Add Add VAT VAT to to total total Precision Polycarbonate Capacitors An All High Stability SUbillly Eilretntlj - E:ltremel, Low Lo" Loiksb Leakare 440V mhv ai: AC (±l" i Jn ~;. ) 63" tatlge O n-diir SSV llanoe /LF (r' Y ~ " 1 50p + "~ :L ~ ~tl ~ : f''' ~ 11.~ t Willill">- -i :~/lc 11, 1~" "yl". :.«ii a 1% :-' " ) Wr 5f1J1 (1 4";/11-' njyj - Mf.flp j-v; n 4«li e n ;tnl' n "t-.-r.jii' " '~:' LJ-' ni" ( r. ~ r'i r am ") ~2Jl 1'''/lF Mt' Mln "Op O'4 ipf 11: '~ Hi'yJ". «f.r i l,ll Wn -inn! ".1,V zip ~> ;:l:(rl,,: ltl" ROtl BOD Slip Mo O'O/ oo<v 1f-' ill i lj <j") ":-1 1") 7.')p 7SB.' 7/,F i. 1:10 no 1 t O!'! l>"i r.r>p R5r R. O ORJl ii-(i«(iy l' cr \~".,-. i"i t ") 80p 30B /j,(/l-' i.-'nf r >n 1 21,0< ,29. t on -O'F 12" x 1"1 Sl "" HO ~'O~d" '10/.!-- l-oaf (2"x("l ('J" (~.. ' x "1 eip C-Oyl' Z-QQ )!l lir.-iwi-- li OJ.llo' ' 'ANTALUM 'ANTAl.im TANTAl.Vn CAPACTORS"-\"llhlcH l"aillllole; 09 BEAD OAl'ACOnS-Vnlitf, CA'ACTOHB Vntura nv hmkm.w: O '.!:!. U-4i....!. ~. '7. li'hli".t l a\'/'.!!)\' or ;:.V; }O'O"F lt/il" 0'2:(. M-J7. at. ijv/'jov J-«l. 'J-V, li \'/:!(\' ui 01' 25V; 4 ''?,'"\'; C'iOjiK HX/iK iki 2'J'0-LF nt SVpJtiV lt (jv/hls' ur tiv/ lv ur 35V; or luv; ltiv; 3a'Ol]" 3.7-0/il-'.~lli\' O\' ; 4i'0/ll-' 1t.:W (j\, ; 100'O~tF A,:W. ALL at i«t nl lop H V or rni'l.. 10 V: efu h. ll 47-0;xF J) fi-r for OS tit 95p. p. :iv fio nr no for d V 4. J QO-OtiF nl..v. TRANSSTORS: TRAHSBTORS: TRAWSBTORS: BC H: / H:J... p BFYfiO 20p JlC iif:io7/h/v lu:ina;i8:il ULH.'i; Hp i lifvon p.op Oi/AjtJ Oil HC1H4/1 8,'t. 11,'Ynl 20p BCH nciia lup OP 12[1 ncdi'.'/ci-jl BL"'.!l~f~l'.!L Hp n'yi"i~ 20p HC H{Hn lu:u7w0 l 0p 2p 0 i ULTN4/1B4L 12p H' Vbl lop Op iil'jr.'/tiivfj lu7r47;ss?«a lu-r^t/o.'ifa j;p Hl'!",4iPt,8A cp p A-T78 HFyr.-i,\lo'li8 30p Ul:16:J/7/H l2p lh' l:14 12p 0(;71 Up nc18~f1h~l OtA'.71«2L lip 12p Up FUH t " F104 BF!7 lop l2p 13p 2X3UC3 (CT :.!~3Uii5 60~ POPULAR - K!J ' ~ 8p. fur 46", H 901.1; JN"6Hi NH6 Bp. Bp, '» DODES N94,; for ". 14 ~ fur for OOp: Bp. H OOp; 1^44 lur 4Ep. HH fip, tip, H 18 for 11 fur OOp: tllr fioo. 1S0p. 24!?4 00. K4 1.aR 6p, li for 21p, '.! (ur 48p; 11' p 6^0; for ; Alia 1 oo~ Bp: 81' ; 003 1X414H ooa Slo: Bp, alp ; <U K UtH 7p: fur 7p; 0U5 27?. OO ~ 7lp: ; ioti fur 48p: 0011 Bp; 8p; H't? 1 N411J B4p. SiP. LOW -.J(lllmW. Tul. :l:6 ~;, "to 6tnA. 6mA. Viloes PRCE Values ArHllaMc; ZENER DODES nntlll.l.hlc: OV. :V, ;t>:tt'. --JOphiVV, ;.1.;1\'. f-kv, :1-1;\', 4.1'7\', 7V, Ti,. ft-l ±6., [,",,' V,. r.-cv, Ci n\" d-sv. 6'2V, a-flv, 6-fW. 7-flv. 7 fiv, a-jv. 82V. o! J i v. \', ikv, 10V, uv. 11 \'. jyv. )'J\'. lav, l:l\,. la-av, 13':1\', HiV, ll\'. lli\'. ~u\'. :!:.!\'. '24". :!.7\',!O\', :1:\,. nt 7j 16V. 7p paeh, 10X'. freil. K 18V. 6 r for 89p, 20V, 89p V. Ho for «4p. 24V. Sb. N'EClAL 27V, VU\. H EClAt. OFFKU; 9:1 V. All OFFElt: tiq nl loll Zmer* Zt'nt-rt for RESSTORS -..:h Ht:thlllty. loll" ullbc ca rbo!! li~~, t'" W at 4D*i:, "OoC. $\\ Kl.uli :\- W nt ~t 711*1'. xlnldlltv,,0 0 <..:. 1:12 nv- El~ fc.-iirn uum: lerit-:-l unlv t'ltrum llr-- - from ft rmn in 6*1, ~.~ n to to 2-2M ~ ' ~M n.. nt. 1p c;lch, 8p of llll~' l1e,"ulne. 70p lur lor 100 n. nt ALL n l any Ht ally cue lp pne vnltn*. Bp \ fllm:. Nl'KlllA. fur lit nf uny HPE( :..\. Vtrti; ime 1,..,t : \" ; lu vnliip. U uf " r cftcli 70o each v»j«e value 2-2!,!. 'J fl n in to 2 'J 2.? M ~ (/ 7Xll :11) rcshiort.) rcsi-llmt) 5. KLCON SLCON PLASTC R - 1,'". U, hl"lul n\:w Hire wire i;ni r,l PLASTfC clld l',1 DU:!; : im> RECTFERS 100 f.r.v. 1'.1. \". 7p i4 14 lur l-.t f. l r 2«]p>: nlul.. 2!lp); JuU hr*iail 100 MA mw 1'.1. \'.. an 8, 14 (ol for aop); Hil) }.l.v. p 4211), SHUOE ft>r aflpj: Nun r./.v. lip (4 for 42pi. BRDGE RECrH'ERS- '!! amp: :!uov top; :HiOV 46p ; KOnv (lolv Mp. RECTFERS-21 40n; 3.1UV 4Bp: Mp. SUBMNATDRE 8UBMNATURE PRESETS- D W nnlv: ALL A"~. hi ut. 6p rficli; VERTCAL each; firffj, (ion, [noij. loo!), 220. ~:wn, 47011, 0-3W no n. W»1. nnw: li /1/)!l, k. inokli, lit n. 2 ~'~k 2k n, n. 4.j, ik 7ka n. KXkO. li'~k n. ink JOlt. n. 16k l fi k (7.22kJ. n.~~k U. 4TkiJ 4;!{ 'J, 1 n{ll( n. ~50kn, ihokq. j ~f n. ~ ldtn.:;1\ n. 1*1,KAHi: VfiOKO, l'.e:\u: ADD OHitkQ. ADO (ftp Hp FONT Mil, "UiiT AND , A(oiJ) 'ACKNU oil ]'ACK X(; ON" ALE ALl. OUUHtn (lheh:i BKEOW UE.()W 5. ~. A.J, \LL FX gxl'o)t'l' PORT OR Ot.Ulo.atS HERB ADD AJJ COriT C OST OF HRA/ARMAL. REA/Alt.~AL. J'1.t';..\Hg A OD H~~ \ <. OHU : UH. Srtirl Heucl S.A.llr 1*LEASE KA.E. fur Ann fll r MP 11.le of of xxmldulinl V.A.T. TO ndtlit/tlllnl CM-rtoek VHllF.llS. ex "tnck leniiii. lcs. W c» r»ul<; \\' hole/mle [irice l ril:c,( lhts a uvullkbld avallablf! to tu lioiia b Olla flite lhle rniiilutlik*. t llrullaljl~.'i. Wl). t# MARCO 1'he Old School. TRADNG L'difailon, Edttalton. Ft, (Dept. Br. Worn, Wem, Shtopifllrj. W2). Shrop.bit TB: Tol: WdixaJ Whixan 464/ /465 (STD STD 0B Mlnlcort 'm-hhk i-lil.j 872J (l'rul lrh. : :\lll1lcort ''rwlhllc J.ld.) Hit AND NEW COMPONENTS by rc- BRAND NEW COM'ONENTS by re turn. Electro Electrolytics, ly tics, 15V, 25V, 2SV, SUV SOV 0-17, 0 47,1,2'2,4'7,, 2-2, 1-7. JO 10 Mfds. n. Mf<ls.-4p ,47- d? t'zt) 4, ' (;'OV-Sp). loo-51, P l50v-7p) ;1' ' <50V 5 )). Oil S'v n (50V 7p). 220 lip (50V Hp). (SOV-!Jp). SuOminioture Suhminiature bead- beadt.y tantalums U-J/35V, 0-1/35V, 0-22/35V, 0'22/35V, 1-Vpe 0-47/35V. 0'47/35V, l/ssv. 1/ 35V, 2-2/35V, 2'2/35V, 4-7/ZSV. 4'7/ 3SV, 10/ JOV, GV, 22/1CV, 1GV, 47/(JV. GV. U0/3V Op. 100/ 3V-9p. Mylar 1-'ilm Flm 00V 100V O-OOl, 0-001, 0-002, '005, 0-01, 0'01, (1-02 Z'ip. O' O-O-l, 0-04, p '. Milliard Mullard Tubular Tuhular Polyester -(OOV 400V EG scries. series, '. ()(l.()-022 3p. a-033-o-t 4u. 0' '. Mullard miniature miniutul-e C333 ceramics E.12 series XM, 2% Ttipf.-'tTpf. ''zp- 8pf.-47pf.-2'2 p. 56p{,-33Upf. 3n. 56pf.-330pf.-3r.' 'olvslyiene Polystyrene 03V. 63V. E2 serins series 10pl.- 10p. 1.OOOpf.-2',.OOOpf. 2' 2 p pf.-10.(l00pf. 3'; l,200pf.-lo,ooopf.-3z p. Miniature lijilistali Hig'hstah Carbon Film Re- Resistor's 'j 13 W E12 series 5% 5 '7;' Rl-lOMll 1!l-OM!2 sistors (10% over 1 Megolim) p. Megohm)-lp. Postage Op. 81'. Prices VAT inclusive.. The C.R. Supply Co., 127 Cliesterficld Chesterfield Road, Shcflicm Shcffield S8. NEW COMPONENTS iiost free. 8% NEW COM'ONENTS post rrcc, 8% VAT included. 2N37n2, 2N3702, 2N N3704, tip. 9p. ' j z W Carbon Film Resistors (Guest UVM UPM 050) p each. Siemens BS25<TO B V :lsov Polvcarhonate Polycarbonate 0-0), 0 ' 01, '015, 0-022, 0'022, 0-033, 11,033,0 0'0-17 ' 047 jif,f dp; 41.'; O-OGit, O-OGS, 0* p. Triac TAG V/8A, 400V/BA, 75p 751' D iliac rliac 25p. Greenbank G-eenhank Electronics, i)4!j4 New Ches- Ches tcr Road, Wimil, Wirral, Mcrsoysido M e rseyside LG2 SAG. TAPE Stamfj for /fsts' R.D.L Ltd) CMton Works Garden Rri... For vaive \ Richmond, j transistorized re- ^ Surrey, / >. TW9 4NS / corders from 2 ea. ZSOirA. Ciulrlrfoe Pu.o, 11" SOU pel TOO. Unus«d Carbon RotlBfaiit. 100 dinvrtial 45p. 250mA, Cilrtriduc Fusoa 1~" 90p ner 100. Unused Carhon Resistors. 100 different 4Sp. Unusod W/W W Rusistor&. 100 nssonoj assorted Q 100 Cai'dcHor Ca,)acitor Mlnlura, Mixture, 85p- asp. ;ib, ~ llj. 8 to 2BA, 2BA. Nyl Nut &. Bolt inixluie mixture Zip, 28p. Brass 32p. 20 Aasortttd Aasorted Polcnllorfiulers Putefltionwters Unused 1-15.,15. Ell( Governmont Stard Jad: Plugs for SOp 6 Ex volt Governmonl M 36 or 18 wait Sfnrd watt Bulb*. J.icl; Bulbs, SUC. Phiu5 SUC, 70p por 4 lor per doz. 50p Eaiplionoa Earphones Ex Gout. Govt. 7ftp 7(1,) per pair. pair, Now Meltr Meter or Casselh- Casselll! Cases, slit? stiff imltalluii imitatiun r«iithcr leather 61" 6:1-" x al" Jl" x 4". Only 55p. \ Ex T.V. T Speakors. Speakers. Porlect. Perf 3C2 30 cliollcaf e!ipt!caf 5Sp. 55p. O'300mA Meters N ew. 7Sp. T 0-300mA 7" Tape Meier* Spool* Now, Spools 16p 161) oacfu 1 75p. cach. All poslaga postage ncludoki ncluded n prico price SOUND SYSTEMS OF SUFFOLK 17& Foxhall Rd. pswich, Suffolk P3 NQ 176 FoxJiftll Rd., pswicli, Suffolk P9 BNQ COMHONKNTS GALOUK. Pack of 500 COM'ONENTS GALORE. Pack of 500 mixud mixed components colllponents mamifacturcrs Jnanufacturcrs sur- 5ur~ plus plus once usr.f!. used. Pack includes resistors, carbon ami W.W., capacitors various, variolls, transi.slors, transistors, diodes, trimmers, trinmcrs, l>otcntiomctnrs potentiometers elr, etc. Send S.,nd C+lOp Cl + p&p. C.W.O. c..w.o. To: Caledonian Components, St.."lhol-c Hoa(\, '1'hol'l1tol1, Fire. Stralhorc Uoad, Thonilon, Fife. Our ofbhe NEW fciu MODEL mprnvod V.H.F. riosign KT und norlormance MKl NEW MODEL V.H.F. KT MKZ Our latest kit. mnrovcd design end norformanco plus exlra HnlpllOor stn!1c. receives (lrcroil. nmaluura, amateurs, mahmc, nmplinof nlohilc, ludia sliifio. rado , rocouas 4. olc.. etc. l>>9 aircrofi. h i, novel little sct ~liv6 yolj endless fl of pleasuro nnd 'll'o apt will oivn you endfess hours ol pleaaure "nd ern be built in ono (l vtllling. vou battery, enn compteto bo bull iti complelo wiih uno ovunlnp. with cfl*v eu sy lo to follow Powered nstruction by 9 volt instruction nod end built with earphones flmplinpr. bulll n lack socket for use wilh earohoneb or amplifier. Only 4 '00 +pafi +p&'n 20p U.K.. only. llostrdted llustrated cntnioqno cnlaloqll o ol of tnlccled.elected kits aacl com- com~ ponents. 20p nc. VAT. P&'P tree. poiioiiea, 20p nc. VAT. PAP free.. ' ALL PRCES PLUS 8% VAT. r ALL PRCES PLUS 8% VAT Galloon Galleon Trading , Burin Trariino Burrp:; Way. Co, Way, Corrinahani, Corringham. Slunlorcf-Lf-Hooe, Stanford.Le Hope, En.x. ssn 9DE Enspx. SST BD TTL AT LOW PRCES! (All cx-stock. ex~stock. Price* Prices nclude include VAT post) l/w /:! ' :!!i/!lo 1/2-1 1/:!'1 2.7/on :!:i/!hl KN'74»f» R~7 Hl " D 0 15 S OLS 0 15 ~ ~ HS74'J 8.V Ni4(1:! ~,'1(4i,) RS74tH 017 SN i HN SNT-TO H:"<1 7 ljij «N741f» 8N74JU ft,:.l.~7480 N OSQ ' SO SN741:l a5 fini48:j 0 ' 9~ 0 95 fls74 SM741S, SN74:!O -, i f5n'74* KN74fl«osa 095 K~,4 Rfi «N"74n(l SNi4:l HNT-iftlt t:;1'>/i4 t1! S744<l SN7 HO Ni4! N744U 017 o la KN74HO HN744'l 1)'; SNThl'J }5Nioi!l:.! 0'5'} 0 53 BNW.Li HNi f.;-) O OG 96 x\74n;i OS? 053 ~\"i4!}!j HN7447 SNi-l SN74 yl R.:"J'i-i:!l '35 HN74r»r S~7 4 rd KN'j n:!:~ sy74?j 017 H1'>/ i-li:! tin»»n74lr» K:\""i ~;-.i ,81 B.V St\", li:1 747: UX74175!-:; :\,i l;;j AH All spec. famous nlilnufaclurers. Devici's devices D evices may full be spec, mixed by lor famaus for 25/ prices. rruinufacturcrs. Send S for tor full list. All prices include VAT Pasfaoe. Postage. J. C. flfi J. 46 BURSTELLAHS, C. JONES (Dept. BURSTELLARS. ST, PWA) ST. VtS, VES, MUHTrNGOON HUNTlNGDON PE174XX (Mail (Mall Order PE17 4XX ofily> only) 957

92 BETA DEVCES fob FOR BETTER BETER PRCES TBAKSlSTOESi TRANSSTORS DODES BEeT BRiDGE RECT. AC187/S AC187/8 fii PR 0-40 DODEB 0 40 NliM & EECT N914 OM flr>oe 0 04 JA la flov EECT. OOv BC107/6/9 BC07/8/ N la 20D\" 0 22 BCODC BC09C O li N-JHO DY1'27 BYl O M 0 14 A 1A la fioov 200t 600v B N4001/2 O O~ 2~ A 200", 12'00 BCV70;7l/720T3 BC147/8 010 S4001/2 BCY70/71/ (S4003/-/.S N4003/4/" A ZETrEfia 200v 2 00 ZENEBS BFXfla B~'X N400"/ llzy88c 3 3 BFY S4006/7 008 BZV8Bo3' BFY31/62 BFY51/52 " 0 18 N r" 33v 5% watt ^ S 0 2Nl32 0'25 SEG 5% N N17l S016F SEQ DSPLAYS 3015F L.fi.D. 200v 3% 0*15 L.E.D. 2S264G 2N DL707-LED l'?o 'log-red N2905A N2905.A D,707-LF.D -?0 1)L747-LED 3 DLi47-LED RED LED CLP 0*17 D OP. AMP. C'. S.S'SOOS 2N3053 Oil 2N30ol'i D.UL, D..L. SOCKETS *QF. 700CTO99 A HP, C'i 70ge T TP20A TP29A D..L TP30A '57 57 SPio 14 Pin S 709CD-.L. 74CTOB9 0 74lC T099 O 30 0'88 SB TP31A O 0 81 fll Fin Pin C 74lC D.l.L. 0*30 0'88 TP32A CD..L TP41A 074.L. 0'85 T1P42A T1P-A 0 TP42A 0*90 74 V/AT 0 90 V.A.T. lur 1'*^' NC. 747CD.1X. 748C D..L. 0.L. 0* OK 7400N O ie, 74 SEREST.T.L. 7474K J 401,\ ON 038 ~ : i: T-WOK ~~:~~RES T'~:~ "^nk ~!~~~ «02X 7402N (Hgji-iaiS 0'18 74:!7:S J5;-; «1 ~1~i~ 0' N OT C 7430N 016 0'18 7< 74121N, 2 ; N o N 740BN 023 J K 7440N 018 0, N 741'22N s0 741, 4ON OK 01S 0 18 "JTK,-'.fiX 100 1, K 7U23N l*2fl J»N T 741:~N S j ri:!n 0-32, 7414JK 74141~ 1-13 C.W.O. BETA PLUS DEVCES, P.P. lop TO ] THE RDGEWAY, ENFELD, M1DDX. MDDX. MULtARD 10W RMS AMPLFJER MULLARD OW RMS AMPLFER MODULES. Absolutely complete indusive. inclusive. LTE. L TE, 46 Minehead Road, South Harrow, Middx. South Harrow. Middx. For Sale COPPER CLAD LAMNATE FOR PRNTED CRCUTS Single 1/16" base-l Op/sq. Single aided sided Sided 1/16'olasa-dpoxy l-5p/eql/is" paper base 1 -Op/sq. nch. glass-epoxy-1'sp/sq, nch. Any reclangulat rectangular sires sizes cut d to your requirements. Please send cash «ith with order. Price includes postage packing. From; ncludes From: SJMTECH ooslage SMTECH ENGNEERNG pacftlng. LTD L VOLUNTARY VOLUNTARV PLACE WAN5TEAD WANSTEAD LONDON E.t MCROPHONES: AKG D09, 12'65; A AKG D202E1, D202El, 43-45; 43'45; AKG DiSOC, Dl90C, 18-70; 70; AKG D190E, 20; AKG D224 55; Sennheiser MD211N, 49-50; 49'50; Senn- Senn heiser MDdiSN, MD'413N, 29-70, ' 70. All br new boxed. Send CWO to J- J. J. Francis, (Wood Green) Ltd... Manwood House, Matching Green, Marlow, Harlow, Essex. Tel: Matching 476. V AL VES, V AL VES & MORE V AL VES. Large slocks stocks , , many obsolcte- obsolete. Also available many types of tran- tran sistors styli. Price lists available, 15p. 5p. Cox Radio, The Parade, East Wittering, Sussex. West Wittering SOUND TO LGHT CONVERTORS 3 channel, kw 18, J 3 kw 25, single channel 9; Sequencer 93; Strobes from 19; Projectors from 24; etc. Call or mail Aarvak Electronics, 0SA 98A West Green Road (Side Door). Door), London N 15 5NS PYE WRELESS wooden case still in working order no new parts original receipt. Offers Box 121. MCROPHONES: Two Pioneer DM 3A. Br new. Unobtainable in Europe. 25 each, 45 the pair. CWO to Hcigh- Heigh way Associates, Avnho, Aynho, Banbury. Banbury, Oxon. Tel. Croughton COPPER CtAD FOR LAMNATE LONDON E Z«. MCROPHONES: AKG D109, 12-65; Matching 476. VALVES, VALVES & MORE VALVES. Wittering, Sussex. West Wittering SOUND TO LGHT CONVERTORS 3- N15 SNS PYE WRELESS wooden case original receipt. Offers Box 121. HRO nine coils, power pack. H- H book, 50. Tel: MCROPHONES; Two Pioneer DM-3A, Oxon. Tel. Croughton 750. Situations. Vacant ELECTRONC CRAFTSMEN s your present job routine uninteresting?? We are a research establishment our craftsmen are engaged on a wide variety of work n in the fields of prototype small batch wiring assembly, test inspection, maintenance fault finding repair, Why not join us enjoy working in first class conditions in the country. country, You can expect gross earnings including overtime of 45 'per week, we can offer good housing at low rental (for applicants who reside outside the radius of our Assisted Travel Area) together with 3 weeks paid holiday with holiday bonus, free pension excellent sick benefit scheme. scheme, Applicants who should have served a recognised apprenticeship or have had equivalent training together with experience in one ofthe fields detailed should 'phone Tadley 4111 ($TD (STD ) 073, ) Ext. 5230, or write to: Jobs galor~? Tens of thouss of new computer personnel needed over ihe the next few years afonc. alone. With our revolutionary, revolutionary. dircct-from- direct-from America, America. course, course. you train as a Computer Operator in only 4 weeks! Pay prospects? p.a. London Computer Operators Train- Training Centre subscribes to the British Government Gm'erament backed National Com- Com ne puting Centre code of practice for Computer Training Schools so you know your training will be second to none. After iraidlng. training. our executive ap- ap pointments bureau- one bureau-one of the world's leaders of its kind intro- kind-intro duces you FREE to world-wide opportunities. Write or 'phone TODAY, without obligaiton. obligation. London Computer Operators Training Centre YJO. Y20, Oxford Use.'. Hse:, 9 15 Oxford S~. W. Tel: RADO AND AUDO ENGNEER re quired for service company- company. City Guilds experience. Will be re- re warded with a good salary, salary. Tel: D. Williams. Wiliams $ B C Elec- Elec tronic Services Ltd. RADO AND AUDO SUPERVSOR re quired for young exping service company. This is a senior position for a man with City Guilds servicing experience. The successful appli- appli' cant shall be responsible for the smooth nmnlng running of an audio repair section. Good salary incentives- incentives. Tel: D. Williams B C Electronic Services Ltd. ndustrial Recruitment Officer (PA/56/PW) Procurement Executive Ministry of Defence AW A WRE Aldermaston Reading, Berks RG74PR MEN! 70p.w. can be yours 1 Jobs galorfl Tens or thouss of Computer Oocraior in only 4 weeks! Pay prospects? f p.a Oxford Sr. W. Tel; RADO AND AUDO ENGNEER re- tronic Services Ltd. RADO AND AUDO SUPERVSOR re- Electronic Services Ltd. r Educational TELEVSON TRANNG 16 MONTHS' tull-lime practical 16 MONTHS' full-time practical theoretical training course in Radio TV Servicing (Mono Colour) for beginners. for beginners. 13 WEEKS' full-time Colour TV 13 WEEKS' full-time Colour TV Servicing course (including Mono revision) for wen men with wlfh a good elec- elec ronies background. tronics backdround. Next session commences on April 16th. Prospectus from; London Elec- Prospectus from: London Elec tronics College, College. Department A4, A4. 20 Penywern Road, Road. London SWS 9SU, Tel, SWS 9SU. Tel CO TO SEA as a Radio Officer. Write: water, Fleetwood FVV 8JZ. GO TO SEA as a Radio Officer. Write: Principal, Nautical College, Broad- Broadwater, Fleetwood FY7 8JZ. Ladders LADDERS, timber aluminium. Tel; Tel: Telford for brochure.

93 Aerials GENUNE FUll 18 element TV aerial GENUNE FUUSZE^T 18 element TV aenalj^^' as used by leading» coio-^ TV companies.. L7 senuuie u.h.f. l»r gnlytzjo, Ma iiued cvllidt or insifle. WTm-,^" Ovllitii nids UcEmicallv f /f /f grid id'inch ulie ccpx dbijjb, limmafi PretiifflB s gn«ti«g.»=» tfl-plfle fth with tlarug. ([amll,instructions lajttvciiftxn M-p id«k6. Uorar Back BackR.lund. Riliffl. W Wall/CiiMia Bncbil Bracket 5j, 25p. BeH Best a 12P prr yard. Plug lop free rfja Cakl' witfi i (kd»r 12 fudermaps&channtlrele f*jpl 9" 1*'4. 6 cb fus iniej VJP refereacf & TRE rence h^j 01 R.dio Transmtters. Sim cl FUdis SENU Dimci & TV DlftlCT ro finvnituii. TO a*^r. Dll'r.»wi9 PW Winsllild Manni.,d Hd-Noltinaftam. Rd. Nottingham. MPERALTRADNG TRADlNGAUVSLTD. ua-isjlm \ lha the quah(y qualltv Aerial Aenal Speciatots SpeCalists Joy MBM beam MulUbaami MBM «100. MBM , Jaybeam MulUbeama MBM 28 5'00. MBM 48 8'00. MBM 70 12'00. Logperlodle 7'00 St«r«obQainK UOpefJodlc LBM Stereobeama SBM 5'00. 5'50. SBM 8'00, '(». SBM SHM , FM9S 11'00. UHF Maslhead M.sthead AmpUrers Amplifiers '00 Low Loss co ax. 12p/m Wo Low CO-BC 12D/in We stock good range KTS BB Block H-F a ACCESSORES. oood ranee of AMTRON KfTS The la s open shop Tnes.-Sal. has a good Tues.-Sat range of components SUPPLlEB L 78 ELECTRONC 71 Chulawortb SUPPLES Chat.worth Rend, LTD Road. Chaatarfleld Chesterfield S«540 ZAP 2AP Service Sheets LARGE SUPPLER OF SERVCE SHEETS (T.V-. (T.V., RADO, TAPE RECORDERS, RECORD PLAYERS. PLAYERS, TRANSSTORS. TRANSSTORS, STEREOGRAMS, RADOGRAMS, CAR RADOS) ALL AT 50j. SOp EACH.. "PLEASE ENCLOSE LARGE S.A.E WTH ALL ~LL ENQURES & ORDERS" " Otherwise cannot be attended ahended to (Uncroued please, raturntd (UncroaMd returned f t aorvlc* P.O.'a..,vice aheela pleoae. sheets not original ava labr«.) available.) We W. oparate op.rat. a "by PLEASE return NOTE of of poat" pott" eflrvlce- lervlce. Any daima clalml lor for nen-dallvery non-dlllvery should thould be b. made mad. within 7-daya ol poetlnfl your Older. 7-daY of potting your order. C. CARANNA 71 BEAUFORT PARK LONDON, N.W.11 6BX We have (he the largest supplies of Service Sheets (alrictly (strictly by return of post). Please etate state make model number alternative. Free TV fault tracino tracing chart or TV list on request with order. Mall order or phone Mall order or phone SERVCE SHEETS for over 6,000 SERVCE SHEETS for over 6,000 models of Televisions, Radios. Transis- Transis tors, Stereo. Stereo, Tape Recorders. Recorders, Record Players, etc., at only 30p plus SAE with free Fault-Finding Guide. Over 50,000 sheets in stock for 10,000 models. SAE enquiries. Catalogue 20p plus SAE. Hamilton Radio, 47 Bohemia Road, St. Leonards, Sussex. Telephone Hastings Hastings 4200B6. SERVCE SHEETS. Radio, TV etc.. SERVCE SHEETS, Radio, TV etc., 8,000 models- models. Catalogue 20p. S.A.E. enquiries. Telray. Telray, 11 Maudl Bank, Preltoll. Preston. BELL'S TELEVSON SERVCES for BELL'S TELEVSON SERVCES for Service Sheets, Manuals, Books on Radios, Badios, TVs, etc. Service Sheets 40p plus s.a.e. Free booklists on request. Back issues of PW. PW, FE, PE, EE, TV avail- avail able 2Sp 25p plus 7p post. S.a.e. with en- enquiries.-b.t.s. quiries. B.T.S. (Mail Order Dept.), 190 SO Kings Road, Harrogate, Yorks. Telephone (0423) Telephone (0423) Wanted TO" PRCES PAD far NEW VALVES TOP PRCES PAD for NEW VALVES TRANSSTORS popular T.V. Radio types. populm T.V, End Radio lypss. KENSNGTON SUPPLES (C>. Yorkshire. KENSNGTON SUPPLES (C), 367 KcnsinBion Kensington Street, Slreet. Bradford 8. Yorkshire. WE BUY New Valves. Transistors WE BUY New Valves, Transistors clean new components, large or small quanlltfes. quantities, a!! all details, quotation by return. WALTON'S. 55 Worcester Street, Wolverhampton. Street. Wolverhamnton. EARLY WRELESS receivers, com- EARLY WRELESS receivers, com ponents magazines, details to Johnson Raffles. Raffles, Haverbreaks, Lancas- Lancaster. ter. AVO. 7 & 8 any condition. Any quan- Croydon. A VO. 7 & 8 any condition. Any quan tity. Huggett's, 2 Pawsons Road. Road, W. W. Croydon. Books Publications Technical Books - i rs%?n,~htwlti Radios Electronics ft l World's Radio & TV Scaitom {iricmationgi Sdnl 0,60 Audio Amplillcrs 0-53 World's Radio & TV Stations (nternational Editl 0.60 Audio Amplifiers Boyx Boys Sook Book of Crystal Crvstal Sets & Simole Simple Circuits Television Timcbam T imebase Ciicuitv Circuits Radio io TV indusiriel ndustrial TuOe Tube fi & Valve Eouiv EQuiv,, Kow How to 10 get the best ool out ol of your Tape Recorder., Modern Elei-crohicTcoubfeihooting Electronic Troubleshooting Jack Darc's Oarr's Service Clinic Clinic Transrstor Transistor Circuits (or for Modern Test Equipment.. EQuipment Pad Rad 8r & Electr Colour Codes Data Cbart Chart HbVof Hbk Equiv. Substitutes.... Hi Hi Fi, Fi. PA 8t Transistor & Disco Amplifier Eouiv. Oetign Subuitutes Design Kndbk 0-40 Hndbk Radio Servldcg Servicing Problems EO 60 Electronic Circuits for the Amat Photographer Hbook of Simple Transistor Circuits How lo to bolld build Solid Staia State Audio Circuits Sound So.und Loudspeaker Manual f EO TV Technicians Bench Manual E2-50 Radio Hbook. EO.70 Television Amateur Servicing Operator's Vol. No TelBvision Servicing Vol. No Television Servicing Vol. No EO 60 Television Servicing Vol. VoL No CO-SS 0-85 Radio Technicians Bench Manual ^ Servlcirvg Servicing Receivers... 1st Book Transistor of Hi F Loudspeaker Radio Receivan Enclosures EO.60 2nd Book of Hi Fi Loudpeaker Enclosures EO-60 Manual of Electronic Circuits lor for the Home 0-50 Modern Crystal Set Circuits lor for Beginners Electronic Novelties for the Motorist nd Book of Transistor Eoulv Equiv.& & Substlrures, Substitutes Hbook of Electronic Musical Novelties Tremistonscd Transistorised Novelties for Hi Fi Fmhuaast Enthusiast Fault FaUlt Locaiian Eaercues in Rai& Rad.& TV Vol.1 VoU ().80 Fault Location Exercises in in Red.S Rad.& TV Vol.2 VoL E1 35 Colour TV Picture Faults Piacticaf Practical Transistor Novelty Circuits Boys Book of Practicat Practical Radio & Electronic* Electronics ^060 O~O Radio Receiver Construction using Cs& & Transis... CO-60 CO-GO Cs & Transhlor Transistor Gadgets Construction Hb'k k (0 60 nteg rated Circuits Equiv.& Substitutes Hbk (0 75 fnceflreied Circuits Equiv& Substitute* Hbk 0-75 ~~J:J:r*** **************** *** J : 'Resis1orColourCode DiscCalculator" : * A 'ResistorColourCodeDiscCalculator' [nvaluable (nvaluable to to the keen radio constructor!) J JJ : OF OFFERED Ft PEO FREE FREE OM ON REQUEST REaUEST fohohoehs FOR ORDERS C3 3 AND AND OVER OVER *: - PLEASE ADD W FOR POSTAGE & PACKNG if. PLEASE ADD 10% FOR POSTAGE & PACKNG * 1;5 ~3i:M~iill"iS'.11 Electronics -an an elementary introduction for beginners by L. W. Owers This new book contains an easy-to- easy-to underst niroduclion introduction fo to the She basic concepts of etectronlcs electronics ncludlnq ncluding radio, t.v., transistors, transistors, integrated circuits, etc., etc- etc. 120 pages, softback (inc. p. 4 &. p.) from Publication Mailing Services P.O. Box 6, Crawley, Sussex RH106LH ELECTRONCS MEN. You arc worth ELECTRONCS MEN. You are worth more than a- a ' measly 40 or 50 a week. Last year earned 3,600 for six months' work, the other six had off. o ff. You could do similar, my booklet,. explains how. t's 65p from Alben, 3 Church Street, Diss P22 SDD. Church Street, Diss 1P22 5DD. UFO CHARTS: Wave Prediction 54p; UFO CHARTS: Wave Prediction 54p; Daily Flight Pattern, 50p; SOp; Map, 50p: SOp;.TV UFO Detection. Detection, 2 Optical Ci: Cilcuits, «3p: 63p; Propulsion Theory. ory, SSp; 55p; "Anti-" Anti Gravity", 55p- 55p. Circuits: Transistor Optical Detector, CGp; 66p; Radiation/Opti- Radiation/Optical, cal. 44p: 44p; Microdctectors, Microdetectors, memory, auto-record, 80p. Sighting Recorder. Recorder, 55p. SSp. R, R. 4 & E. E. Highls, Needham, Suffolk. Suffolk. Miscellaneous r---- MN ACCUMULATORS a 2 MULT US Sailtd volt Laid Acid USi S ~~~rale a~~. ~~n. R»* R" Sin chara«4bl«sie. U5«1-4" C«Ua. uso-t 4" x 1-1* t t... * -44" nc. 3 P.* for & P. t-b5 )~ Sl«S.e x 5". 5,~A23-1 CA7-1-r 3 'Tor lor * x 235 J i-r :~,. inc. nc. P. A & P. SARFELDS, GARFELDS, 241 at Ry«bo Lane, Lsr.o, London. S.E.tl P TREASURE TRACER MK Welal locator i «Vflflcap Varlcap lu.-.lng tuning ' # S.'lla r;~~~~nrttklt r.'i best aelllng rrela! jocata." H best telling. matal Sfe'D ^ * * Weighs Speaker end only earphone 22oi. operellon operation 17ln. \iv n l m Knocks Preboht down Prebullt search to coll only coli assembly 17Jn. VT i S Z Mlnftlry epp roved design ~~n!~~~ :~PBBCt a~~ ~~C2 w K \ \]\ i, 9 Aj Tou icen You orty on only need asci aolderlng.no BBC2 lolderlng iron, TV ron, Ml\ screwdriver, pliers tnlpa Pk. _ acrewdisver. Five transistor pflera tranlistor clrculf «nlp» circuit S Send a.a.o... for leaflet teaflet Comp'cto ~~mpletp. 9'80 g. Burii.iestod :~~~~ guarariecd :~~~~e(' d ~ ri*-7x; P P&P45p A P.+ + Tflp 78pVAT P P&P45p.,. - l VAT MN KTS ELECTRONCS. ELECTRONCS, 335. ia LANGLEY DRVE. (Mall Order Only) LONDON E3LN Ell 2LN AUDOSCAN, the "do-it-yourseir" AUDOSCAN, the "do - it - yourself" speaker mail-order mall-order specialists. High fidelity speaker kits, chassis units, units: sound absorbent, grille fabric ana much more. Send Vp 7p in stamps for bargain list to: Audioscan, Dept. PW-9, 4 Princes Square. Harrogate, Yorks. 4 Princes Square. Harrogate, Yorks. VALVES. V VES. Huge stocks of rare obsolete types. SAE for list. White- White side's, 35 Central Road, Manchester

94 1 ==i~iil FANTASTC NEW MCROTEST 80 MEASURES /, ONLY 90x70x18 x 70x18mm.t:.':~~~1 Fantost/c Fantastic va/ue value at fields of measurement 40 ranges VolU Voll D.C. D.e. $ rartqet:,ang : OOtV OOmV -2V,- 2V. -OV. QV. - 50V, SOV V, 2ooV V. looov. {20i;R/V> (20k fl/v) Voll» Volts A.C. 5 rangei: ranges: -5V. SV. -OV. 10V. - 50V. SOY V. 2S0V. -. looov. (^kn/v) (4kO V) Amp. D.C. 6 & rangci: ranges: 50yA SO-'A - 500yA 5OO~A - 5rnA - 50mA Amp. 50m A A.C, - 500mA A.C. 5 ranges: - 5A : 250tfA 250lA - 2'5ntA 2'5mA - 25mA - 250mA 2'5A Ohms Ohmi 25amA 4." rangec; - 2-5A ranges: LowO Lawn -f] -0 j; le 1 -G -0 * x 10 -D -0 x 100 ",0 dl 0 find MegaO) V (da Oulput 1/10 di Output 5 ranges: n flno a 1-5V, 5 Mega 1 5V. ~ -10V. n) - 50V. SOV V. - looov. Ooclbvl* 1OQ0V. Decibels 5 rangai: ranges: + fedb, 6dS, -f +22dB. +3SdB. +36dB. +S0dB, +SOdB, +62dB Capacity 4 ranges: 2S/lF 250J..LF 2500-LF 25.00Q^f < fanges: 25^F - 250^F *jF - 25.oo0"F 5UPERTESTEH SUPERTESTER 680ft 680R CE 20,000 Ohm per Voll/sensl- Volt/sensitivity against tivlty exlernal Fully screened external magnatic magnetic fields Scale width i small x 95 x case 32mm) dimensions Accuracy (128 stabluly stability 11% ( % n D.C., D.e., 2% A.C.) of reading n A.C.> Simplicity ol indicated ease of readibility accessaries ol use accessories 1000 readlblllty times overload Full ranges Printed of circuit de solderlng More board ranges is lhan removable any olher without fr* dc-soldomng ;e~~~ea~kgf:/~r~ne a;:t~:~~~e a C O meter. A*k (or (fee catalogue X O 3 w ~cce.~ories (e.:tra:l,a,yv.ailable convert Mlcrotest 80 Acceasorfes & Supertestcr (extra) 680R available nto into following; to converl Mlcrolest following: SGNAL NJECTOR, GAUSS METER, ELECTRONC VOLTMETER., TESTER, TEMPERATURE AMPERCLAMP, PROBE, TRANSSTOR PHASE SEOUENCe NDCATOR Send for dalalls. MORE RANGES FOR LESS MONEY! AC/DC ACDC Multimeter Mu1timeter type Ui3?«U4324 A-DC A O 06 3A - 6 Ranges, A-AC 0'3-3A 0 3 3A - 5 Ranges. V-DC 0, Ranges. V-AC V-8 V - V - 8 Ranges, 9 Range. Ranges. Fmrj,: FreQ.: of to 20kHl. Resiatance: n the ReSistance: 500 range Ohm o' 45 lo 5 ta MOhm- 20iHt. 5 Ranges. Decibel:-lOto dB. *31 Accuracy: 2 4% Dimensions: ± 2-5% 167 x SB DC. ± AC 98» x 63 mm. Only 8*85 SoS5 small case dimensions (128 ALPHANUMERC NXE TU The Alpha - ~ ~_ numeric NXE ~ - " (. ~ t~~1~\:1~ l l_ : -... ~h.~~~'er:p~~ia~ ~ : 1 lngle lube.. '.,l1li="". From the st-.. "t~, ~~ J - J point rsidabujy ~:~~~bi~:y ol boih b:~~.~ -riil.'ty* " 1f,.,Ti'". electrical characteristics, the Alphanumeric NXE lobe charadetlsrica, tube provides unique beneflt. * providea many hc unloua AJpnenumerle benaflli 17v 21mA -tc operation ncluding * Uniform, + Uniform. continuous l7v-21ma line * All chnraclers d.c. operallon characters ot of aqual equal height * simple state Memory with almple solid slalc drive in. 200 circuits ioollamberts * Readability footlamberts brightness n high ambient * Long (He light... life with no loss losl ol of brightness ir * Character height 2iln. 211n. Prlca only 99p 9 each plus Bp P/P. Bases for above Mo each. J JUST ARRVED!! NUMERC NDCATOR TUBES Ullra-long Ultra-long life, high aualuy. Quality, nnd2lndcoen- 2 ndepen denl dent decimal points- points. Supply vollao voltaoe 2WV 200V D.C. Current 14mA, 100.u.s. r height0-s1, uma. 0-51, overall Pulse site duration size <»s. Character 1-4. Br new, guaranteed. to manufacturers reaulrements. new. guaraoteod. requirements. Type BSflSSst Surplus 10 manulactvre ri 85853st W 25+ lop WO+ 25-f price 90p an on apptlcation 100+fiOp application Md Add a% 8% VAT t» to.11 all items + 35p P S. & P. ELECTRONC BROKERS LTD- LTD Pancres Pancras Road. Road, London NW1 20B 2QB Tel: Tel; 01-B VOLT 21" 13!Wal1 Fluorescent Llghllng (by Thorn/AE) with dlffuaer & on/off switch. deal cara~an, boat, emergency lightinp,etc. Guaranteed. SALOP ELECTRONCS 23 Wylo Cop, Shrewlbury,Shropshlte Tel HEADPHONES: B ohms. Suitable com munications receivers, Partridge Electronics Ltd., Broadstairs, Kent. ~BULD jijuilotihe THE FN FM *TUNTR ] TUNER~!!' STEREO "" S p,,, r- Bi rvtf 0 SAND OWN ~ PW SAND OWN ~ ffil 12 VOLT 21" 13 ivvall Ftuorescent LfflhlfrD (by caravan, Thorn/AED boat, emeroencyllghting.etc. wllh dhfuacr Acn/ofl switch. Guaranteed. daar r 5'50 50 inc. nc. VAT 4 & Post. s. Ulsl List orlco MB price 7'02 nc. VAT SALOP ELECTRONCS «W,l. Cop, Shrewsbury. Shrop.lilr. T.L M2bi UEADPONEtS: 6 ohms. Suitable com- ' Electronics Ltd, Broadstairs, Kent. ~ i L L(S> K llcq) (Q)~ i ~ ~ ij OPCB.PCB acmpms & Cmpnls 1nc.TR nc.tr 8, & BOX _ ~ ffil #Push.Push Bus Butlon ion Unit.6 Position Posllion... C 2.97g] 2. 97ffil 51 ffil #ME7ERS.Tuning.METERS. & Level_... _eache each ) 1.50ffil.50[gl ~ Subminaiure.Subminalure Switches _.. set sel of d 4 C 2.62 ] 2.62~ Dl [51 ffil 9Cabinois.Cabinets & Front Panels to orrferg] orderffil ~ «VAT.VAT NCLUSVE PRCES PBP P & P 25f@] p@ 1! ffi1 ffil U S.A.E.. lor for further details detals g] ffi1 ffi1 0 FW ELECTRONCS,, 40 TUDDENHAV1 TUDDENHAM RD.0 ffi1 ~ Dj PSWCH^ PSWCH. SUFFOLK _Pa P4 ZgL.Ma^ 2Sl.Mail O^de^orA Order only~ Sj HARD WAKE. Comprehensive range of HARDWARE. Comprehensive range of screws, nuts, washers, etc. in small quantities, many useful Construc- Construc tors' items. Sheet aluminium to indi- indi vidual requirements, punched, drilled, etc. Fascia panels, dials, nameplates in etched aluminium. Printed circuit boards for this magazine other individual requirements, one-offs small runs. Machine engraving in metals plastics, contour milling. Send 2 x d'jp 4'2 p stamps for catalogue. Ramar Kamar Constructor Services, Masons Road, Stratford on Avon, Warvvicks.. Warwicks. CV379NF. ' CV37 9NF. FLUORESCENT LGHT KT liahl Veu '«<»i* j»t boim in hantni.bafdflri.ddvai.iaa. ili»* r*vrfvl oaadmy iifosl CillSiPAfl. Cl 'flm.no. E.i-«flP ubpliod. in# luho. naife ecancilrj p p<iprj itfm-ifv.erk. 14 f.m «>sjalil C.B, tac- FVlce only 3-19 ice va Ready built 3-78 pgaj DHfusof ocxly 5?9ri eivlra, '" " ELECTRONCS DESGN ASSOCATES A!>"'OCATES DEPT. 82 Bath Sl.WitBall.WS EPT, PW St. Walsal1. WSl 3DE, 3DE. Phone336S2 Phone336!l2 ffil ALUMNUM BOXES DON'T LOOK unless you on resist the tempuiion to unless you can resist the temptation to get these super 'attention-geuers'; 'attention-getters': * Pccbet-sixed Pocket-sized MAX-VOLT MAX.VOl T Big!mch iinch Spark Spar-k Generator (instant 15,000 voln?). volts!). Rca^y-made, Ready-made, needs no batteries. Carry Car-r-y jc it around any- any where. On/y Only weighs about 3 oz. (89g.) send for your Ma*!- Maxi Vok Volt now! * Unique TRANS TRANSMTTER/RE M TTE R / RE- CEVER Kit. No licence examina- examina tions or tests required to operate this transistorised equipment. Easy to build. Gee Get cransmiuing. transmitting, Send < for yours now! *- Psychedelic MN-STROBE MN.STROBE Kit. Take a pocket-sized lightning storm to Disco's & parties. 'Brain-freeze' 'em with vari-speed stop-motion flashes. ncludes super case too. Send nowl now! (all prices include V.A.T., packing & postage.) Send remittance to: BOFFN PROJECTS, 4 CUNLFFE CUNLlFFE ROAD, STONElEGH, STONELEGH, EWELL, EWEll, SURREY (Mail order U.K. only) Or for more mor-e details, send 20p for lists HAVE YOU HAD YOUR CHPS? HA VE YOU HAD YOUR CHPS? AY-S-1224 ~Y Digital Clock Oock chip now '95 inc. mc. VAT, post free. Circuit de- de tails s.a.e. GREENBANK ELEC- ELEC TRONCS (Dept. 322). 322), 94 New Chester Road, Wirral. Wirral, Mersey Merseyside side L62 SAG. 5AG. Synthesiser S "Sounds 'Supreme" by Pewtron Dewtron (V A extra. Famous kits, kits. e e.g. g- waa-waa wa.a-waa cotnplele complete kit dt 3-50; 3'5{); Fuzz kit ' 50.?&? P & P 25p under 10. Ring Modulator modules 9. "Mister Bassman" Bass BaSB Pedal Unlts Units whole Whole range of synthesiser modules, musical novelties, novelties. etc. Cata- Ca.taiogue logue 5p 15p rom from D.E.W. Lid.. Ltd Kingwcod Ringwood Road. Ferndown, Ferndown. Dorset. PRNTED CRCUT BOARDS. PCB PRNTED CmCUT BOARDS. PCB from your patterns 1 plus 5p per snuarc square inch. From published patterns in this magazine 50p per board. Add' VAT, 5p p&o p&p per PCB. Mail order only. T.E.C. 241 Dumt-oak Bumt oak Broadivay, Broadway, Middlesex, Middlesex. SMPLE TO FORM SMPLE TO FORM NON-MAGNETC RUST PROOF MLL FNSH ALUMNUM FLAT MN SHEETS 101ns. loins. *14ins. x 20 swg (0.90mm.) 6 sheets for 2 incl P&P OTHER STES SZES AVALABLE For general car repairs, trims, Kick kick plates, etc. BAYKN ENGNEERNG LTD. GREVLLE GREV1LLE ROAD, BEDMNSTER, BRSTOL, BS31LL LL

95 LOW COST.e. MOUNTNG. Lengths LOW COST.C. MOUNTNG. Lengths of 100.e..C. pin sockets, 60p 6Qp (pip &. p 5p). Sp). Quantity rates, SAE details 11< 6c sample. L.E.D. L.E.D, (MLED500), 20p each. each, (post paid). P.K.G. PJC.G. Electronics, "Oak Lodge',, Tansley, Tanslcy, Derbyshire. NTRODUCNG our NEW PEAK NTRODUCNG our NEW PEAK reading V.U. Meter Meier system which offers a high stard of monitoring at al reasonable reasonabfe cost. Full details on above ourrangeof rangeof AUDO MXERS sub-assemblies available in kit form or fully Jully assembled ready to use. Consult:- PARTRDGE ELECTRONCS Ref. P,W. Ref. P.W. 2t Hart Road, Benfleet Essex. Established 23 years. PRNTED CRCUT MAUFACTURERS PRNTED CRCUT MAUFACTURERS OFFER, pc&; PCBs for All PE PW projects published after June '74, at one price 70p each. Any S, 5, PCB sets 'for: PW Tele-tennis, Sown Tuner with screens, :/. 20. PE CCTV, 1-45, ' Power Slaves, 2-35; f'35; Scorpio gnition, 'WW' Ferret Metal Locator, 6Sp each. CWO Prices inclusive. ~to~r~~u~~1on~~a~~ce~ PRODUCTON SPACE AVAL-.QtlL: ABLE FOR; FOR: PCB production, PCB electronic design, electroplating, silk- silk screening, roller tinning, photography all artwork. Estimates by return post Kst or phone. WKF Electronics ElectrOnCs Well- Well beck ck Street, Whitwell, Worksop, Notts. Tel: 695. Notts. Tel: 695. AERAL WRE. High quality- PVC AERAL WRE. High quality PVC covered multi-str copper, 50ft SOft 60p (lop); (XOp); 75ft 7Sft 87p (13p); (3p)i 100ft (l5p); (15p); 150ft 1 80 fl-80 (24p); 200ft (26p); 250ft 2-96 ' (28p); (28p): 300ft 3 E3-S4,54 (31p) (3p).. P &. & P in brackets. Longer lengths available. SAE all enquiries. Al A Radio Components, 14 The Borough, Canterbury, Kent CTl 2DR. Borough, Canterbury, Kent CT1 2DR. FBRE OPTC SOPPUERS FBRE OPTC SUPPLERS We stock a wide range of products glass sloclawltfa plastic plesitc fanoeol light llflht conduit, Fibre Optic plastic producte monofibre, flhrp, (decorative effects) acces8orles-plus BccefliorlM plus mono- Mare's Tails lenses. lensec, tdecofallvo retroreflectofs. re1forefl«ctofa, eflacts) redl red/ yellow/gree yellow/qfeen/lnira-fed n/lnfra~red emitting emjttino diode.. dlodea, photodetector.. polarising filters, ultrasonic transducers. photodeteclora, pofadslng Hlflu, ulfraionic Send S.A.E. S,A. < tor for short form Hal list to; : FBRE P.O. Box OPTC , SUPPLERS (PW) London Wl0 WtOOSL. 8SL. ANTQUE WRELESS ENTHUSASTS. ANTQUE WRELESS ENTHUSASTS. For all your requirements in radio, pre-1945, pre-194s, contact Tudor Bees's Rees's Antique Wireless Service. Service- Retail shop now open at 64 Broad Street, Street. Staple Hill, Bristol. Tel: SUPERB NSTRUMENT CASE by SUPERB NSTRUMENT CASE by Bazelli, manufactured from heavy duty duty PVC faced steel. Hundreds of Radio, Electronics Hi-Fi enthusiasts are choosing the case they require from our range of over 200 models. Gen- Gen erous trade discount. Fast despatch. Free literature, Bazelli, Bazelli. Department No , St. Wilfrids, Foundry Foundnt Lane, Halton, Lancaster LA2 6LT. LOWEST COST C SOCKETS. Use LOWEST COST C SOCKETS: Use Soldercon C socket pins for 8 to 40 pin Sin DLs. Make 8 pin sockets for 4p, 4p. 14 i pin for 7p (at 300 pin prioe). price). n strips of loo 100 ;l!.ins: pins; 100+ pins 70p, p, 1,000+ 4Op. 40p. nstructions supplied. lop P&P for orders under 2. Add 8% VAT. Send SAE for sample. Sinllel, Sintel, 53n Aston Street, Oxford. Tel: Tel; AERAL BOOSTERS 3 30 AERAL BOOSTERS 3 30 We make three types of Aerial Boosters: Boosters; B4S-UHF 64S-UHF 62S, 625. B2-VHF <40S B-VHF, Bil-VHF. RADO VALVE BARGANS Any 5-SOp, S 50p, p, 10 75p, '30: : ECC82, ECCB2, ECL80, ECL80. EB91, EB9, EBF89, EF80, EFHO, EF8S, EF8S. EFB3. 183, EFB4, B<4, EYB6. 786, PCCS4, PCC84, PCCB9, CM, PCCB9. PCC89. PC97, PC97. PCFBO. PCF86, PCFB6. PCFBOS, PCF805, PCFB08, PCFS08, PCLB2, PCL62, PCLB3, PCies, PCLB-4, PCL84, PCLBS, PCUS, PFLlOO, PFL200. PL36, PL35, PL81. PL8. PLS04, PY33, PYB2, PYS2. PYBOO, PYB00, PYBO PYBO1,, 30LlS, 30115, EH90, EH90. P 88, PCB6. PC86. TV COLOUR VALVES PLS08, PL508, PLS09. PL509, PYSOOA. PYS0QA, 2Sp EACH.. Press.. Button U.H.F. Tuners C2-50. Tuners-Q 50. Rotary U.H.F. Tuner_ 2 oo. Tuneri PLUG SOCKETS (Price per item, tem, in brackets for tor ten) CO.AX CO-AX PLUGS 6p ip (SOp) (Slp) Socket surface 7p (60), Connectors 4p (35p). D..N. PLUGS. 2 pin. pin, 3 pin 5 S pin lop 20p ( 1-65).,65). JACK PLUGS. Stard 18p Sp ( 1-50), ' 3' S mm lop (SOp), 2 S mm lop (SOp). 3-5 mm lop (SOp), 2-5 mm lop (80p). All prices include V.A.T, V.A.T. P. p, lop per order. Money back refund. S.A.E. for lebflet. lebllet. ElEaRONC ELECTRONC MALORDER (B0HY) (BURY) LTD. LTD, Bridge Bridle Street, Rnmsbottom, Ramsbottom, Bury, Lancs. Lanes, Tel: Rams- Rams TRANSSTORS (p. A p. Qp.) TRANSSTORS (p. & p. lop.) All now new full spec, spec. BC107/8/9. BC107/B/9, BC147/8/9, BC147/B/9, BC157/8/9 BC157/B/9 all Op 8p BF180 BFt80 25p. 25p, BF182/3 «p, 4Op, BF184 17p, BF187 13p, t3p, BFW10 55p. 55p, 741 8DL 34P, 34p, BF336 35p, 2N3771 1)0, t to, 2N3441 SOp, 50p, BD13t BD13140p, 40p. EX COMPUTER PC PANELS EX COMPUTER PC PANELS 4 x 2in packed with semiconductors top quallly quality resistors, capacitors, diodes etc. Guaranteed mln. min. 35 itan- tranalstors, plus data 25 boards 1 t (30p) DURAL EXTRUDED HEATSNKS, 10D 100 outline, black anodlsed, anodised, drilled tor for elstors, 4 x T03 transistors 5 x 4 x li 1* 40p <t5p> (15p) Slm. to above.butfor 8 x T03 5 x 8 x li 70p "lop (27p) ELECTROLYTCS S.OOOu 15,0001' 30V, 30v, 68,000ji 68,0001' 16v 65p (22p) ao.ooou 30,0001' 25v 65p(22p) 4,000)1 4,0001' 70y, 3,600p 3,6001' 40v 4x2' 4 x 2 55p(15p) P SSp 5,000p 5,0001' 3Sv 35v 40p(12p) 20A 100 plv S S fees. recs. for 1 t (12p) 3A 100 plv S S recs 4 for SOp lop (Bp) (8p) mixed resistors SOp lop (lap) (13p) 250 mixed eapacliors capacitors SOp lop (11 (llp) SO t50 mixed H-STABS SOp lop (Hp) (llp) 200 S planar diodes 60p lop (8p) OH QH bulbs 12v S5w 55w 50p SOp (7p) 2N306S 2N3055 EQUV 4 fo 1 t (lop) Postage packing shown in in brackets ADO ADD 8% VAT TO TOTAL i Slm.foabove.bulforSxTCMSxBxli KEYTRONCS (M»it (Mail Order only) EARLS COURT ROAD LONDON W Quality Loudspeaker Systems less than half hat/price, * Direct from manufacturer as supplied Direct'from manufacturer as supplied by us to the trade. Finished in natural Teak veneer 15 watt Sohm bass reflex speaker system containing Goodmans 8" S" bass H.F. tweeter. Frequency response 50 Hz Hz. Complete with leads DN plug. Cabinet size 17" x 10" x 7" deep. Price only 16.00/pair ncluding including VAT plus l 1.90 packing, carriage insurance (U.K. mainl). insurance (U.K. mainl!. Please send cash with order direct tot- Please send cash with order direct to: Forward Marketing, 30 Ridgeway, Stanground, Peterborough. Peterborough. *Bu!k discounts available for trade enquiries. *Bulk discounts available for trade enquiries. 961

96 NEW YEAR BONANZA B.B. BUPPLEB ollor:- LEV1R SUPPLES LEVER k«y koy witch, OTtri-.wllch, 4-poU, 4-pol., Jock-ofl-lock, 10ck-otMock, n black pfbdtlc plullc atackabla alackable caa* ca'e apo- app. 120mm x t20mm 120mm 25mm. new 'lip PUSH x button 215mm. buhon iwjtehlng Br raw.wllchlng unit, unll, 3 two-pol» Yip two-pol. c/o clo unit#, one cancala cancela othara, other., room for on* one mort more unit. unll. 76mm eomm x 35mm. new e'lmd App. 78mm numbarad) x Wmm * 3Bmm, Br n»w Me ~~;:':';,n~:~:.te~ ELAY, 24 volt, MOO ohma. ohma, 4 c/o clo contacto. conla~ Size: Size; x16mm (wired coyered). Br 40mm new x 33mm x 15mm (wlrad covered). Mp Hp LAMP fllllng, 0 yoll_ontalnod Unlahid, fttlino, flnlahed, gray g"f ataal 8 volt contolned aleel box on wood ptlnlh. n hammer pllnlh. daal d.al caaa ~~~~~. for a '~:~/~~:ct mall projacta.. Slxe Six. app. PP. 78mm 75mm > x 75mm X 75~~ SPECAL 70mm. Br new 5tp unlll tor.11 tornm lem. + uaeful price accanory. until for all 4 above acce.. tl-m T S/energlalng S/.nerglalng earplacae earplec.a <ab!vaoed) (.ayaged) Mp ZOp All pr/c.. nclude.nd p M.ny o/h" CoW. prlat Govl. surplus, nclutf* ""rp/u., ntw VAT n.w tnd fd sfb p. 4.hlnd Hams p. Mmy /t.ms at bat othtr blrg./n a tin pr/cai,... S,A., S.A.E. for Ntw N.w Yur r.ft Cafa/ogue C"/ogu. ofumrontc./.tron/c prftto; Plr/.'o: M :11 HEATHWOOD GARDENS, SWANLlY KENT OARDENS, SWANLEY BR BR7HN 7HN f you have difficulty in obtaining PRACTCAL WRELESS Please place a regular order with your newsagent or send 1 year's subscription ( 3.25) ( 3,25) to: to:- Subscription Department, Practical Wireless, Tower House, Southampton Street, London, WC2E 9QX WATFORD ELECTRONCS POLYESTER POLYESTR CAPACTORSi CAPACTORS: Axial A,.lle.d lead lyoe. ype. (Valuta (Value. are n/tt). 1'1). 4MV! 400V: C 0'001'. M , 0 '0011, 0015, 00' , 00'0022. OOW. 00' , Up; ztp, 0' , 0 O ooea. 0048, 0' ' Q-022,api 'M '022. ap; 0'047. 0'008, 0'1. 4p, 0'11. 0'22. 7p, 0'33. lop, 0' Up, novo 0'1. 0'11. 4p, $p:0'033lp;0'47ipj0'8810p;l'0t3p. 4p; 0-1S p: Sp, 033 lp, 0'47 'p, 6810p, p. 250V: ZOV: p: 0 22 Op; 0-47 lp, 0-33lpj Up; 1B0V: 0' lp, 00'68 M 01,0-15, 2p: Zp : p; 4p; 'P: tp. radial lip. RADAL LEAD UAD P.C. TYPE (Values (Value. era are n WO. 1'1). 35 CARDFF ROAD. WATFORD WATFOHD. HERTS,. ENGLAND 2S0V: 0'01. 0'015, 0'022. 3p: '033.0'047.0'068 3'p, 0 1 4p: p, 0' 22. 0'33 Sp, p, 0'58 lop: 1'0 lip: 1'5 20p, 2 2 2Zp. MAL ORDER. CALLERS SATURDAVS SATURDAYS ONLV V: 7p: 0-01, C M lop; llpi Jp; 1 - E 0 20p; 033, , Mp lip; 01 4p; 015 4p: 0 22, pj ONLY C.W.O, C.W.O. Pli'.itc. Pt',"!". ' P. ft. Ko P. p..ijil,hid l^i. 1'Jp lo 10 O'll. 1 ordl"'s '. mull-/ undl r L Pnev. PU.....elusive t:)[<. h''>\l e of VAT LECTROUYTC ELECTROLYTC CAPACTORS. Axial A'lallead lead typa(vbluea type (Value are reln lni/f> ") JVsl 3V: 1' ,3 3,4.4' p e.ch. loo Up. loo, p. 30V: -O.TS.a 2,3 8,4.4-7,fl-8,10, S , «p each, 10012p. 40V: 100, «p. 3eoo. 31p. 2SV: 88. p: SO. p: lip: 470. Up. 2SV: Up: p, All cuiitlranmili 'UPOlt!tS wool) tjrancl ntw new an. lull, lully (in ~ J Uo\l,'ntCl:tJ antto 2200, 34p; 3500, 34p: 3000, OSp tp. 23Vt 31p. HV! 08, p; \V: <0,125, , 6p: 2SO. 6p p. 16V; lip; \V: 1000^ , 13p. 25V{ tip. 680, Up. 10VS4. Up; lov: lw3p; 1000, 24p; loo 'p, 640. TRANSSTORS (l<» (le 10X 10% lor 25+ ol 0' one Woe) ype) TTl TTL 7. le SERES 10d:J000. 'OD: d:2200. Up, lip. AC107 AC07 Kb "p BCiaa BC82 Hp lip OCM OC31 Ub p ZTXSMi ZTX MO Hp tip Up lop AC125 AC25 Hp BC1J13 BC83 Hp OC41 15p Hp 2N706 Hp lip 7401 Hp lip 7481 lup CERAMC CAPACTORS MYLAR FLM CAPACTORS 10p SOV Plaquetle leads. toov: 0 001/11. 0'002/11. 0' 005/1'. 3p, AC21 AC2S Up BC1M BC84 lip OC.J OC42 Up 3Sp 2N70a 2N708 Kp 'p 7402 Hp lip Up MV d.c. Ploflualta body 25mm luada. "p R.nge: Spt-O,ooopt e.ch. AC127 AC27 Up BC22 SC212 Up OCM OC44 Hp Up 2N131 2N31 Up lop 7403 Hp "p 7483 UOp Range: 5pl-lO,Wpt price 2p each. MV: O'OOluf. 0'002ur /;l, p, 0 01//1,0'0151'1, 0'02/11,9'04/1'.0'05/1' 'Po lop 0'015,,1,0'022/11, O'033/1t, 0'047/11 O' /lt, 0'151'1, 0'2/11. SOV: 47/1' p. AC12fl AC25 Up 2N13Z Zp 7404 l.p 7484 tsp Acnl AC17J Up Hp BC21. BC213 8C214 17p Up OC45 np OC70 2p Hp 2N1132 Up 2N1301 Up 2N301 Mp 7101 Ho 7184 Hp 0 015p, 0 Wl/rf, O- D33^f, 0 OiT/if 3p O-Ol/it, 0 015#il.0 02Hf, 0 04pf. 0 05/il 4p. Olwt.O 15<il, 0-2//F. 50VS 0'47//f4p. Zp 7405 Hp lip H7p t7p AC1B7 AC87 Up BCYll 8CY31 Mp top OC7 OC71 Hp lzp 2N13a2 2N302 Up Zp p Mp Hp POTENTOMETERS POTNTOMTERS (AB) Carbon AC1B8 AC88 Up BCY40 Up.. p OC72 Hp Up 2N1303 2N303 Up ZOp >p alp Hip 'SSp Track. Track, 0-25W 0' 26W Loo Log & 0' 3Sp BCY42 Zp OC74 Zp 2N304 Up 7406 Z1p :!lop ~gm~: :g~:~ H: gg:~ :: ~~l~ ~:: ~m ::: m~ =: 4 PRESET POTENTOMETERS Llne.r 0'2W: looo-mo Horlzonlal ACY17 Up QCY.2 2lp OCT. Hp 2N13W Hp 7408 Up 7489 UOp 1KQ-2Mn K 0-2M 0 elnple lngle gang 5W Llneer values 14p 0 25W; 100n-1Mn Horizontal p Up K-M 0 Verllcal ACY1B Zip BCY33 lip OCB Hp 2NU05 Hp p 7490 Zp ' 5Kn-2Mft K 0-2M Cl alngle geno g.ng D/P twitch switch 2lp TK-lMft Vertical p 21p 2K 0-2M 0 du.1 g.ng.tereo O'W: SOO-MO Vertlc.1 ACY20 Hp BCYD8 Hp OCB2 Up 2N130«Z8b 7410 Hp 7481 Mp (2 duel gang atareo 42p 01W: MO-iMH Vertical 4p ACY2 ACY21 Up Zp BCYSfl 8CY9 Hp,.p OCW OC83 Up ZOp 2N1M7 2N307 Up Zp 7411 Z2p 7.12 ftp lip BCY70 lip OC40 loop 2N1883 Zp 7413.p POTENTOMETERS RE81STORS S.blllty low ACY22 Kd BCY;0 Up OCMOMp 2N83 Hp 7412 ZZp Up lip p SLDER POTCNTOMCTERS RESSTORS ADHO AO40 Up,.p OC201 70p 2N1e90 Up 7413 Zip 7414 lop O 25W log values J~"c l%l. :~n~~'om m \-:' ~,~ ADlJo.P AO,..lo BCY71 41p BCY72 Hp Hp Up OC202 OC20f lap 5p 2NtS«lOp 2N227 Mb 2N2217 Mp Up llll ! P lop 7415 " p 0'25W loo linear valuea Type Tol. High Renge Stablflly Vol. Low 1-4B nolae 50 +,55 Ml> lop KO-5OOKO 81ngle g.ng SSp AD Hp BD31 40p TP29 Up 2NZ303 Zp 7418 Up 7416 tsp OK-5OOKohm Du.1 g.ng SOp 'W C 1% 2' 20-OM E2 ADtS Up BCU.Op AOl62 3Sp BD32 40p TP29A 41p 2N2483 Hp p sap AF14 '4p :gm =: T p N.Jp 2112X J1 115 ' 5Kn-500Kn iloglo gang asp W C S*/, 2-2n-lQM E24 to p W C 5% 2'20-OM E2 2'Sp AD 82 UP 00,55 TP2flA.5p 2N2<83 Mp 511? 155 "" " p 10K-500Kahm Dub oang Mp WC A:: P KNOBS E2 AFllV BD,3 ' "0 TPJO.P 2N2W4 ~~~~ Mp t:: ~:~ ~:: ssp ~m: Afill HE BD " "P TP30A :P BDY p ~l~~ Hp 2N22M UP il 2 55 iss p ' < ' M " KNOSS for above Black or Silvered Bp 1WC &% J-SO-OM E52 p 'p 4W WW 10% 6% 2-2 >-10M ifj-toon E12 E12 p l-jp - 2p Sip fijj! JlE BDY11 lllp TP3 Mp 84: 2N2S07 2N2907 Hp 'p :lip ~m~ 4Sp PLUGS SOCKETS p BDY7Up TP32 "p 2N2925 'p 7425 :lip r,p Plastic Open af!!? l.e 21" 1\" re Body metal ~~m ::: BDY17UP TP3 Up 2N2M0 lo »5 "U' ""B Mp "P JACK 741,1 Mp Screened fluos Pieillc tcilj 1SS BDY10125p BDY8'Zlp TP33 tip Sp ZN3MJ 2N3053 Hp lip 7428 Zip to: qulr.. dl.m. AF21 ielo? 115 3S SDY1e lisp TP34 \sop 2N30S alp lop 24 3l BDYUUSp yip}, uon 2N305. 4lp T ZlS ,16 chrome Qod* en aockts Moulded PANEL METERS tal with Size 74,51 Mp "P break qulni W 11" * 11" dlam. re* BDYeo Sp TP41 tsp 2N3035 'P 7428 S.P p 2 5mm lop contact. S 115 BDYM lip '25 2N 3055 Up rill AF125 sl 8DYO SOp TP41 A ftp 2N3014 Hp 7430 'p Hp 3' 6mm Up p p ME6-O/A AFSS jj5 AF2 3l B 0 *" ic» TP*'A Hp 2NMU ilw,15 ll5 74,55 cgnlacli hole. "O ME6-a0;/A 8F84 lop 70p 2N3515 tip 7432 alp 'Op AF2 0 lop p ME7-OO/lA teiel 155 BF,M "p TP.2 76o SNM<! 74,53 Mp "P iss Stard mono 17p 7.zp 8F06 lop np 2N3702 lip p Up 13p 13p 17p M E8-OO,rA aclol 155 Bf '",0» TP42A7.o an3 ' l>! "P ilh ,4 ',l,p ME7 OO^A p BF.. Up 2N3703 Up 7437:11p 0 Stard lie reo 30p lip Sp 2Sp ME8-lm/A AF30 af io 155 BF!M SSp 8m7 "0 lip TS43 ;;5 Zp N3704 Hp l;s 5! p MEfl 500//A Hip te!15 Up Up ~:m 10 p AF BF,S,, lop 8FX84 "p Z2p Tillt TS44,15,J 7p Up» 71.1* 41n 74,61 ME9 tm/a p ftp line Dll ME0-5m/A AF238 ifola h5 BFXM Up 8Fxae MP Z1p TS4S U5 Sp 2N3705 2N3708 Hp is 'M i p 0FXM 51 p BUS SJ5 sniim up Up 5K? lip lp 2.3.'.1(180. PLUGS SCKTS. SCKTS. low PROFilE ~~~~:~~;~ BC07 p BFX68 Zp TS48 Hp,.P p m:: 4,63 "O SSS2 S' BFX88 1, 7441» ils N3707 Up ::: 240') 8 1z;;---p--s;;- Up ME13-loom/A :gl~ :: :m~ :: ~l~:::: ~~~~:: :: ~m :: B 74,64 DN NyNE OL SOCKETS ME0 5m/A ,66 Hip,Mp 2,3.4,9(160. SCKTS.) L 0V7 PROFLE ME1 10m/A BCM BCM Up 'P BFYJ1 BFY50 Hp Up TSM TStl lip Hp in3>m 2N31M p ill? \Sp BC.7 lop 8FY52,.P TS52 Z'p 2N3713'ZOp 'lop ,. Pn Sp ME4-SOOm/A BC147 Up SPY82 Up T S 2 Zip 2N37U1Up 511J lls 5S5 i 4 '?? "' p 24Q > 0 pin 8 Fin Hp ME12 Mm/A 7444 nop 14 Pin Hp WE13 loom/a 7 1M 1M,, 51 10p lip ME- BCUB lop BFY83 1p TS Zp 2N3715 UOp 7441,ltp g!1s!5p BFYW "» TS^, 7445 tlflo CO-AXAL p _(T_V_) ~ --..!.':_ Sp Cf.'.) CAR ME8-50V BC4S BC140 Up lip HFYB5 BFY55 Zip Hp 2TX07 "P ZTX07'Op Up 2N371B 8N P MP l!S "1" } (TV) 2N3718 'lop Olp p BCUJ BC57 Up BFXa» BFX2S Mo Hp ZTX108 ZTX08 Up lop 2N377 2N3771UOp Mp 7447 KSo M lop [18 Pin Hp ME14 S00m/A P <ap{ ME15-1 AMP '."lcar AERAL ME19 90V AC 'lp Zlp PHONO p 5p(s.l.) pp ~~lu~g=s::-=::: ME7-300V BC1SS BCU8 lip "p BFX30 Zfip Hp ZTX10S ZTX081Zp Hp 2N37l21Op ? 741 " 2N3772'top lip np... t.d 7p(dbl.) MME8- _',',Sy'u' "MMEETTEERR S!2! BCU9 H13p Up 7 "P.) PLUGS M V AC 41W 126p 7p(dbl-> MJEJMMp MJE370 Up ZTX300 12p lip 2N3773 2N p 2MP 7451 Up 'p 741B p lp _c_ol_o_ur_8 «0p Op(trpl. (rpl, CHOKES (RFC) M 10-"S" METER 1.5mH Sp S 5S BC67 lip MJE371?tp '4p 2N3810 Zp 74sa lip p BC68 Zp MJE520,.P 2N3820 Up 7484 lip 74181!lOP BANANA p Sp 2'5mH 2,41 SS'H 55 55!! p MJE5" Tip ZTX301 Hp 9N33U 2lp 7453 Up flip 1-5mH 15p ME10 "VU 1 * METER BC68 BC 9«120 MJESM Up MPF102 Zp MPF02 3 SOp 0p ZTX30. ZTX302 ZTX304 22p Hp ZZp 2N3823 2N3320 HB Hp 7454 Up t0op 2 > 9mH each OUR PRCE CJ 4 lip 7480 "p BC170 8C170 lip MPFttl MPF03 ZDp 30p ZTX311 8p lop 2N39(a 2N3903 Hp 7460 B Sp Zp Lt.. : lip : Mlnl.lure push m.ke o. 8C171 S!'l!! p 7470 Up Up La S% SWTCHES MPF10.2tp MPF04 Zp ZTXM ZTX341 "p 2N99M 2N3904 Up lip Zp S + ml.. BC172 OPOT 22p br.ak nonlocklng lip BC72.lip,lip MPFMSlp MPFOS:llp ZTXeoo ZTXSOO Hp lip 2N3905 Ub 7472 Up 19+mixed TOGGLE: SPST Up PUl PUSH BUTTON: Mlnlhluro pueh to mak or 1p p DPDT alp (white): 2SOY ch.ngeov.r BC177 Up 'p OC28 «p 4tp ZTXfl2 ZTXS02 Hp "p 2N3J08 2N3908 Tp 7p p p Lala L.. a 10% SUB-MNATURE TOGGLE. "p break nonlocking 19p changeover 35p off 2Sp 6C176 BC178 Hp QC2B 0C28 Hp Sp 27X501 ZTXS04 Up 2N.(U7 2N4037 3p!5p SSp 50+mixed + SP changedver ROCKER (white); 5A 250V SP chanaaovai ml... d BC17B onlot! 3Sp 2SOV lumlnaled BC178 Up OC38 OC35 Up 4tp ZTXM ZTXsal Up 23p 2N40S2 2N p SPST Up DPDT on/of! ROCKER centre SWTCH (While) 3A 2»V MumlnBted 25p 14p switch SOp LNEAR CS C'S MC1304P MC304P Mp 'lop DODES BRDG TRACS SLDE: ta la 250Y lip 1 pol./12 2p/8w. 2p/2w. 70DC Dll/T0893Zp MC1310P Z7Sp AA20 lop RECTFRS 400V 3A Up la 'p 2p/4w. 3p/3w. 3p/4w. 4p/2w. 40/3w Up 709C DlL/TOO&Mp MC 310 P?75p A DP DP 2S0V 250V ROTARY neon ewlich 50p 2P/4W. 3o/3w. WAFER: 3p/<v/. i pole/12 4e/2w way.?p/9w, C DL/TOMtOp MC1710CG Dll/T09970p ~~l?j~; lop :::,!lyloo lip (P.lllc Cue) m~ ~~ :: T 4n/3w 34 p 741C flflln 8pln OL Dll 3Qp MFC40WB 40p TRANSFORMERS Mains LAMP HOLDERS/LAMPS 30p NSSS Up BY84 3Sp la SOV ZOp 500Y 6A lop Prlm.ry 22OV-24OV.. top. 14oln 14pln DL/ NE555 Timer 5p Primary 22OV-240V LES Dll/ NE682 Hp BYZ Zp la 400V ZZp 400V loa USp looma lop Gr.en/Yellow/Whlte. j " Up T099 T09 Mp NEM2FMSyn Hp PA246 PAU8 UOp JMp (miniature) 100mA 90p Grein/Yellow/Whli#, HOLDERS Dome " lop, hole Red. Blue, 14b 1S0p OA5 31p la eooy ZSP 500V loa 10p p Les Bulbs 6v p V47Cl4pn 747C 14pln OL75p Dll?Sp PA2M PA253 44Jp mA BOp Lee Bulbe 9v 2v 6p 445p OA9 'p 2A SOV 30p 8T2 Zp HOLDER. H.avy duty top 748C aoln 80ln DL D~ «> DAC ST2 25p looma Mp MES Up :t:f:: m: OA79 lip 2A 200V 40p Z:'E"'N";"R";-;';;"';"" requires " V looma 90p mlaio &L4f4A itlss 1K5 A79 l5p UP NEON.24OV R.d lop j" hole 2Sp 7105 (T03J Up TAD100 TADlOO AM UOp ZKNER 18-O-B also 34V 100mA Mp Red nnd HOLDER, Amber Hoavy fequlrea duty, {" hole round 25p top 1S0p OA81 p 2A eoov "p 220p As but +" aqua CA3018 \zlo T&A8M TBAlOO 1,3p J5p OA85 10p DODES mA 220 p NEON. 240V Red round too i* hofe 25p lop 4A 200V Mp 3'3V-3SV () la nop top. C A3020 P ZH41* ZN414 1«p 3 V-MV,'Op OA90 p 4A 600V 70p p "() 110p les 12v. 3 5v. 24v CA : LaaalS^ Le.. 15% 15 +mix 400mW 3O-34-21H A «0p NEON. Red or Green Ae above lop bul with y square 25p 5-0 2A H bp LAMPS + ml.. OA81 p OA 200V lop 1' 3W 17p AM All 6p p each LES 6v. 12V, MES S-Sv. 24y CA303fl lop OA2OO OA eoov p VER080ARD Pllch CA3046 ALUM. BOXES VEROBOARD J:: 0'1 0' ' *" shall) CA304a ~l"e~~roncs OA201 p SCR ~!~~tlt" 2j*5fxir 4Sp :~: clad) (plalnl pointer CA30W 3p Mlnll,on 30UF ~~:! :p (Thy,lalo,) 4xtlX r 45p (copper 01 clod) 0-15 {plain 0 15 KNOBS (To fit L" ahaflj K1 2t :~:: b~ ~7gl.pl.y l:: Pl4OO7 12: l~ ~V :: ::2t:~ '." :: x3 30p Z3p Up silvered aluminium lop CA307S 4Sp «3r p 23p Uo K2 Black DOinter type p l5'" 1" Up 15p 1%" with chrome Up CA30ai 4lp 3,3l" Up 3Zp melal lop. casoioe SOp 13 2 «3i" xs' 32p 32p 5p K3 Black Slim allvarpd U" wdh Blumlnlurn chroma rim 5p Up 32? a2p K4 Black with brlghl metal top. lisp OCP71 lip N14 Sp A 400V Hp 3,2,1" 31p 31,S" 31p 31p ~~:: g~:.'l ::: N4OO1!2 5p ~~ m~ ~: ~:g:~r :: 2t X17 21p die. lip CA300CO 3P 6 is" 31 " lip 7Sp metal top skirl LMW TOW Tip 2 *ir bi 3lp asp 26p Blp 75p 55p K5 33mm Black d1a. Up "7" 130p OSp 79p ~10. 20p LM304 T098 Mp 170p ORPel 41p N4OO3 p 3A 400V 7Sp 10,7,3" lp 4t,17" 173p 105p Aa bul with black polnt.r LM305 TOW lllp 3 4 xir xlj" 1Mb USp 19 P numbered with 0-10, matal 37mm loo skirt 2Qp 130PLED TL ZO(Red) N4004/5 p 3A eoov tip 10,..,3" Hp Pkl 0' 36 pin. 20p skirt 20p MC724P Wp Pkt of M pine 73p losp K6 Ae K5 but wllh blflck pointer Hp wllh clip "p N.008/7 7p 7A eooy 'Hp 12,5,3" lz1p Spot face 49p Tapered with metal top MCf 303L ZOp nop 2N p N4148 Sp 18A 400V lop 1218,3" Mp Scot fece cutter K7 Tepared on eklrt Black wllh mela! lop end 2lp llop Pin niertlon nsertion tool 1001 lip Skirt aklrt numbered O-O.'SOmm '30mm dla. die. Mp, 962

97 TWO NEW ADDTO ADDTONS TO FANE 'POP' POP* RANGE LOUDSPEAKERS pop 70 15" Also for those who can Jg± POP 55 12" afford the very best -«W tt 60 ii/ W af tt.». 70 a / Fnr For nefnimonf nstrument Reproduction PonrnrlnrHnn fl'lmbtl QU Wall a mpedance mpedance mpedance 8 ohms or Two Super Sensitive Models 8-15 ohms 17,000 S ohms CRESCENDO '12' B. ~~~:: ~~~oo Gauss deal for Lead Gu itar etc. Diam.2" Voice ;:;i;~. Coil ~~il J2" 12" 75 Watt 2" Pole Diam, Diam. Gauss 20,000 1N~LtOpU~0~o~~ Range SO-?,000 Ha Diirn.l" wact 70 watt RMS Ran^e Range Hz 45-6,000 Hz Two Super Sensitive Models CRESCENDO '12' B deal for Lead Guitar etc, CRESCENDO'15/100 OOA' General Purpose mpedance 3-S ohms.gauss 15,000 Voice Coil Diam. 1" AN ALL PURPOSE UNT OF HGH SENSTVTY ~E~~~~~GH Rec. Retail Price inc. VAT General Purpose 15" 100 Watt 2" Pole Diam. Gausi.. 20,000 inc. VAT Rec. Retail Price inc. VAT BREF DETALS OF 'POP' ' RANGE HGH FREQUENCY NOW AVALABLE N 8 ohms or 15 HORN UNTS ohms Rec. Rewil Retail MODEL910 /-r POP'15' *15' <15' 12" 15 Watt Rec. Rec. Rating SO 50 Retail Retail " Voice Coil inc. VAT watts with f; Price pprice recommended <25T' 8 99 ' POP '25T' 12" 25 Watt CRESCENDO'12'B B CRESCENDO'S/OOA' '15J100A' filter " "Voice Coil inc. VAT <50' inc. VAT POP'50" 'SO- 12" 50 Watt [nc vat Wm 2" Voice Coil inc. VAT There is also a 12" Crescendo MODEL 920 Mk 11 (as iliut.i^s^j illu,, ) Speaker for General Purpose SGNFCANTLY POP'60' *60' <60' 15" 60 Watt " 2" Voice Coii Coil inc. VAT Public Address, a 12" S" NCREASED SENSTVTY. with for Bass Guitar etc. UNCHANGED PRCE. Rating wmn recommended <100' 18" 100 Watt OOO:a~t~nded filter POP'OO' filter id^q.qt'hs- ~~T Please Piease send S.A.E. for leillei leaflet on HORN 100 watts aitjo JU VAT 3" Voice Coil inc. VAT UNTS 8 & 'POP'' or -CRESCENDO' 'CRESCENDO' Range Filters lor for cither either mode'avahable mod,el available if required of Loudspeakers Distributors to Wholesale Retail Traders LNEAR Traders-LNEAR PRODUCTS LTD.. LTD., ELECTRON WORKS, ARMLEY. ARMLEY, LCEDS- LEEDS. Manufacturert Manufacturers enquiries to FANE to--fane ACOUSTCS LTD.. LTD., 286 BRADFORD ROAD, BATLEY, YORKS Prices shown correct ot at Dec Oec i 11 i,.f97t 1974 NDEX TO ADVERTSERS A.H. Supplies , A.H. Supplies... Allard Electronics Ambit nternational Arbour Rlecironics F.lectron ics A.S.P. Ltd. B,B. Supplies B.B. Supplies Sarrlc Barrie Electronics, Baykin Engineering Ltd, Ltd Bontley Bentley Acoustics Beta Devices B.H. Component Factors Ltd Bi-Pak Semiconductors Bi-Pre-Pak Ltd Ltd , Bib Hi-Fi Accessories Ltd. 912 Boffin Projects Both Bothwell well British nscitute nstitute of Engineering Technology , 872,948, cover iii British National Radio & Electronics School , , 952 J. Bull {Electrical) (Electrical) Ltd Bywood Bywood C. Caranna C. Caranna Chlltmead Chiltmead Ltd Chromasonic Electronics C.U. C.J.L. Ltd. Codar Colomor {Electronics) (Electronics) Ltd. Crescent Radio Ltd.... Crofton Cro(ton Electronics C.T. Electronics... Custom Cabinets Custom Cabinets Dabar Electronic Products Doram Electronics Ltd Dabar Electronic Products D.E.W. Ltd Doram Electronics Ltd... Electronics Brokers... Electronic Design Associates... Electronic Mail Order Ltd. Electronic Supplies Ltd , , 884, Elcccrospares Electrospares Electro-Tech... Electrovalue revalue Ltd. Elvi"s Elvins FoUtead Electronics F.W. Electronics... Felstead Electronics Fibre Optics Supplies F. W. Electronics... Galleon Trading Galleon Trading Garfields Goldring Greenweld Electronics..... Group Three Group Three H.A.C. {Shortwave) Products... H.A.C. (Shortwave) Products... Harverson Surplus Co. Ltd. Heath (Gloucester) Ltd. Henry's Radio Ltd..L.P. (Electronics) Ltd. mperial Trading... ntegrcx ntegrex Ltd.... ntertext (.C.S.)... Kensington Supplies Keytronics cover iv Henry's Radio Ltd rover v.l.p. (Electronics) Ltd. nccrtext (J.C.S.) Jones. J. C. 957 Kensington Supplies Keytronks Laskys 875, Laskys , 876, 877 Lewis Radio Linear Products Ltd Logic Leisure Ltd London Computer Operators Training Centre London Electronics College 958 Maplin Electronic Supplies Maplin Electronic Supplies Marco Trading Marshal!, Marshall, A A.. Mil Milward, G. F.... M Minikits in ikies Electronics... Ministry of Defence Ministry of Defence Nowmart Electronics... Newnes-Butterwcrths... Newmart Electronics Newnes-Butterworths... Partridge Efeccronics Led. Publication Mailing Services Partridge Electronics Ltd. Phoenix Publication Mailing Services Radio Book Services Book Services... Radio Components Specialists Radio Exchange Ltd. R.C.S. Products Ltd. R.D. R.D.! R.5.C, R.S.C. (Hi-Fi) Centre Ltd. R.S.T. Valve Mail Order Co, Co. R. & T.V. Components Ltd. Rivlin nstruments Ltd. Riversdale Electron its R. & T.V, Components Ltd... Riversdale, r Electronics Salop Electronics... Salop Electron its Saxon Entertainments Ltd. Simtech Simtcch Engineering Ltd. Sound Systems of Suffolk Strong Electronics Ltd. Studio Electronics Surplectronics '" Swanley Electronics Swanlcy Electronics Technomatic Ltd. Trampus Electronics Led. T echnomatic Ltd. Teleradio Trampus Electronics Ltd. Ulton Components Vero Electronics Vera Electronics... Watford Electronics Wtlmslow Audio Watford Electronics Wilmslow Audio Xeroza Radio Xeroza Radio Z & Aero Services , , cover' ii jj B

98 \. Hud Office end Winbeuic "ud Offce Wanhouae 44A 44* WEJTBOURNE WESTOUE GROVE LODO LONDON Wl W2 SSF 5Sf Tali Tel: m 727 S64H2JJ 5641/21:1 AC/DC MULTMETER TYPE U4324 ~~~!ii1!!'~'0. i" ^ """ 33 rangss up to 33 ranges up to 3 Amps AC/DC; l200v 1200V DC, SOOV 900V AC,500kn, W*- +«+12 db. Sensitivity: E*^nS(gg 4m/v ac Accuracy: ±4% AC Sensitivity: 2Okn/V ookn/v DC; qc; 4kn/VAC Accuracy: :!::2 S% ±2-6% OC: DC; :!::4%AC Movement s protected by silicon Movement s protected by silicon dlodes- diodes. Dlmenslons Dimensions 187 l67x 98x63 x mm. Weight; Weight: l 1-5lb. Slb. PRCE: complete with teat test leerfs, leads, nstruction manual flbre-board fibre-board storage case 9' Packing & carr Z & AERO SERVCES LTD. P_ eend lend all correopondence correspondence Mat[-Ord«r«Hail.Orders to Head Office When sending sendine cssh cash with order, please include 0-0 is 15 in for postage hling hlin, MNMUM CHARGE 5p- Sp. No C.O.D. orders accepted MULTMETER TYPE U4323 m. Sensitivity: 20,OOOO/V. 7 D.C. Voltage ranges O'S-1000V 86 A.C. Voltage ranges 2-5-ioooV V S 5 D.C. Current ranges 0 O mA 4 Resistance ranges ikci-lmtl lkn-lmo Bullt ln Built-in oscillator providing providng AF output of 1kHz.F. output of 465kHz with an ampli- ampli tude of 1 volt minimum. PRCE complete with leads plastic storage case Packing & postage 0'50 V Retail Shop 85 8S TOTTEHHAH TOTTEHHAM COURT R0M> ROAD LONDON Wl W Tel; : ] Open all day Saturday AC/DC MULTMETER TfMETER TYPE U ranges: 600/A 600/rA to 11 5A AC 60p.A 60/iA tol-5adc to 1 5A 7SmV 75 to 600V DC 1 5V 1 -SV to 600V AC 1MO, O 5p.F,12db PRCE; complete with test leads, service manual steel carrying case Packing & carriage ALL THE ABOVE NSTRUMENTS FEATURE TAUT SUSPENSON MOVEMENTS PRCES ARE EXCLUSVE OF V.A.T.. V- 7 D.C. Voltage ranges 0-5-1OOOV «CrS *1 tude ot 1 volt minimum. Dimensions: 140 l40x87 x 40 mm. Weight O-Skg 0 5kg PRCE complete with leads plastic storage case Packing & postage 0-50 DC Retail Shop Open all day Saturday 39 ranges: 1MD,0-S/rF,12iJb Accuracy; Accuracy: 1-5% 1 5% DC; DC: 2-5% 2 5% AC i?:i Sensitivity: 20k 15s n/v 0 /V DC; 2kfi/V 2kO/V Sm AC Mirror scale 86mm long. Dimensions: Dimensions; 115x215x90 x x mm, Weight 3-Sib. 3 3b. PRCE, complete with test leads, service Packing & carriage ElEBTKDfllBS ElE[]T~()1[J~ TU MONET ~ONEY BACK f F NOT SATSFED. LARGE LO~ GROVE ROAD, URGE STOCKS. LOB PRCES. ALL,LL BRAND BAA.~D NtV Ne!> TOP GRADE FULL THFimFUS WNDSOR,BERKS. SPEC DEVCES.CALLERS Llias KELCOXE. Wli L':OME. EAST FAST SERVCE. SEND C.N.O. c.w.o. ADO AUD VAT TO AU ALL S PRCES CES S X U.S. K. fl? p,p SP. lsp. liusopt EUlWPli SP.OVERSEAS 2 S O~"RSEAS S5?. 65P. CATALOGUE/LST FREE SEND S.A.E Digital Displays 110% vero vera 702 OfA OPA Ofln 6~p ~"Ft.: " OOO!h',\f VERO P;';S,;3b l Sp N[X H 301lF 703 ; 2Mp : FC40(O SJp SHC OH ms MNmON' 3015F 70S RF/[? 2Hp MrC4000 K AF 3Sp PER CLlD VEROBO.lRO 1"' O-yDP O-yoP.S U. 1 5 «ea 70i> TOO9 T099 Zip :ifg40fro 54p SPLCiAL OFFHR 1 * VLXO PN5*30 Z p : ift:t03u 5.!p 7 H ~ 9 p ~ 1-' 29p :,'fc6llll ~lp ss ) p :N414 z!xs" Z7p.Zlx:;l" Z4p. 3!x3!" Z7p. l.o~) LtO um O.S" 0.5" digit 709 OL u zyp l<if(>0>0 S2p D (1p : l SJld l. h.l :H xs" Z9p.3!x 1 H. SO 0-!?l)P O - ~UP il.i'j l. 4!i Ck L N.3bp MFC001O 00a 711 2Dp MFC p COPPER CLAD VSROHOARD 0.1" 55S 67p ZN414 il.du llxi" 27p.Zj*33 M 24p.5jx5j"27p. MFC S011" Sl.lO 5txS" 29p.3jxl7" 1.50 ca 720 1:!t) RaJi3.) S.S9 1,39.rFCSOt» : Ft.': XlJ itl 1 EC U ~ ~ 107,BC108,BC103 1 ) ltc108.bc109 Dp ~tp ca ea OlL ' s 6:o:.4i" O.SO JtlMBO J UMBv Ltu Lt;u o.t." 0. 6 " "23 7.!3 RcgulalorbTp Rcgulator {17p 2: p Three [or.u XE 5.'1 :; ;;;\'/,! 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Otbers Others have done it, so can you "Yesterday received a letter from the nstitution informing that my application for Associate Membership had been approved. can honestly say that this has been the best value for money have ever obtained, a view echoed by two colleagues who recently commenced the course". Student O..B., D..B., Yorks. "Completing your course, meant going from a job dclested detested to a job that love, with unlimited prospects" Student prospects"-student J.A.O. l Dublin. "My training quickly changed my earning capacity., in the next few years, vears, my earnings increased fourfold". Student C.C.P., Bucks. Practical Radio & Electronics Electronics maintenance Over SOfegr on ft ' repairs for a spare time income a career for a ways to llil ^ mt* time income SECURTY j ' Thai's how long it will take you to fill in the coupon. Mail it today "'Yesterday received a letter from the nstitution informing that my better future. ~ CUT OUT THS COUPON----, ^5" ~ Tick or state subject of interest. Post to address below. j MECHANCAL KECH. AHCAL DRAUOHTSMAlf- DRAUGHTSMAN- Construction Society Surveyors Jnlltitutl" _ Poclcty of SHP fcimmetbn Sofveyora n»utuie Ellgineers- ~:C.S.J.. L' la.m.a.e. Kvetawen A,M,S,E. (Meclk) nstitute (Mech } 0 };ngincering City & GU ilds llnm lnstitute itute ot KnfrturttinR n CUy L.a8.. 4 fiuflj* r of Dcsigners General13uilding Kiidtifer Engineer & licbignci* Cenetal,\: <A.M.l.E.D.) 0 (all b!anchc~) U Tcchniciann A.M J.E.*.) ralj Building [A.M..E.! r~~~~~lli~i~;ls Corner [) ~;~~~;~\SllansbiP A Healing branches) 6 Vent. T 0 ~~~~~~~:tc ~:nt" C CJtY CTY & GULDS 'rnuef.lsmrjtfhlp n*t. J;;Jcc. j)raught!'llan- '~ o H 0 Urn, Gell. >l«ch. Mech. Kne. Kiee. J'raughtsnian- Work* Clerk of En~. J;hip 0 Ste Sur :-ey!d p; " MatorpitAucc 8'.\fainl enancc Ktifi. o Site SurveyJnjf Elg. Architectural Hu /th Engmeermg WcWiji* ArchHeetnral Health Knslncerlng f Weldill!;. D raught.sman~hip 0 Road ~n st C- f :Cl. ))iesel E ll!;. qu~nt l tl c!:l KJird Ceii. lk*! Shee l. Metal Knu, ~ c V.*k Technical Quant ConMruction C Work Drawillg Ci F.stlmates C EllS. nspection Kng. nsprttion imawlhf; O Es'in-ite, t ka 0 Hydraulira Hydrl\\li {'~. 0 jkiir. Ellg'. Mtfallllrgy Metallurgy 0 Structural Slructursl Kuc. Lllj!. ': RADO & TELE* TELE- ELECTRCAL ELECTRicAL & COMKUNCATOME COMMUNCATONS GENERAL lelectronc eit.y & Guilds Agricultural E lj[. (CTY & GULDS CHr fe Cuild* Triccooi*. Tclecomfl. n Agricullural 0 Council Ens. - Ceii. u cn. Bkclncal Electri cal <^n. Cen. Kadto Hadio A & Tr Cuuncll Eiiit. TV n~t.it\ltion~ Ci lkiigineerliir Koc. El llcering U F.l ' "~~ 'o in-d Uulionf of Knp..\.leur... 0 Farlll Sciellcc Kkctrioi tadin Anislcur- Kami Sciencr L:. Electrical.. u ~ Pla.!:tieM iliiplak.v.i llitallatiotl iii* 0 KSMlt PUstict EXam 0 Kkctrkal Electrical Mat.h~ 0 tmlhi Hadio Hen Sen icing kinc U Cl SUJ)plilllelltary (juniniler SuMrilnwaury "llputcr courscs 1'."at m ect-ronic!! t: Meet rm n cuurscb 0 rtificat c!l. Elcctruuic Kkccrunlc Enp. E~. L AOTOSSOBLE AUTOMOBLE 4: Ccrtincr.le?. for.vat. & lt.vriica! PraClica.! Hadio,V ~ Elect Elcctronlc~ rank* tail.. AERONAUTCAL U!ttitutc o f the jwrth kli) DiotHulc of L (Wit.h kit) J Motor [ndu!!.try A.M.l.l. KtANAQEHENTd: A.M.1.1. mtaalry Q ANAGEMENT'" MAA/1Ml o PRODUCTON troddctch MAA/iMl CUr City «&. OolM* Guilds G.C.E. tnstitnte MilHle of (f Coat Cost Auto.Eng. t M.inagcmeut ~ ' Managemcut Ocn. GC. Ante Anto Ens. En;;t. choose -choose from '. cetnt.s. 0 Motor Mot.or Mechanics ij JCiMlipillcf 'olllpul er Auto Aulo Diesel Khr. Eng. 58 '0' & 'A' J'rojri li'rogralllfjling iiiu lift; 0 caracc Garagc M'ment. Q o level subjects Work* Work!-l M'nicnl M'lcn t. AKU A~G Wurk ~\Tu Study Sttl(ly 0 KdChiecilXbt; Aero El\r;::incerin~ EMma Exam9 Q r,:en. (^n. rrolucllyti ProuudiOl yen. Uen. Aero ling. Eng-. D 0 Enx. "EnH'. 0 1.E!ttilll:Lting EMlmallng A- &.: CONSTRUCTONAL CoachinJ! for manr l!' 'laiininc COSSTRDCTONAL nc «>r many lannlllg 0 exams. ill Cllllling E 'ickim-pini; ri StClrekce Pill ~ [] nsthnic nstitute of Cuildine Building C... (: fanagcltl maxejucnt C'lt L.LO. U. 0 Qualiiy ilb> L..O.D. a t: csam*. A i: nclitillnc 8kiJl~ 0 Qualit y Contr.. A.lt.T. Llcrk of A.B.T. Clerk CO/ rll [1 Wurk.'! ftno OUT FOR YOORQFF To To Aldermaston Coflege, College, Dept. RPW02, Reading RG7 4PF. These letters there are many more on file at Aldermaston College, NAME..- NAM E speak of the rewards that come to the man who has given himself the Block BOC k capiiai? V capitals pleate please specialised know-how employers seek. There's no surer way of gelling getting ADDRESS ahead or of opening up new opportunities for yourself. t will cost you a stamp to find out how wc we can help you. Write to POSTCODE... ALDERMASTON COLLEGE OTHER SUBJECTS F~~~~.S~ ~JE~~~... AGE... Dept. Dept, RPW02, Reading RG7 4PF. Accr:dJtcd Member,B.C HOME OF BRTSH NSTTUTE QF OF ENGNEERNG TECHNOLOGY Acc/t4llea by C.A.C.C. Hembtf of A B.C.C. Publlbhed Published oik (ll ai» ivoslninivl)' approx illl<\t!.:ly the t "ill 7th ol of eavh cadl limlilb month by 'OMazarine* 1 PC lj agazille~ Limited, J.illl ited, Plotlvviy Flcdwar Uuuse, KarrEngdoti l'"arringdon Slreet. Slree:t, London EC4A EC-iA 4AD. "AD. Printed Prinled n in Engl by b y ndex Printers. l'rinters, ljun»ti>b>. DunslatM. Bc«l«. Bcds. Agcll ts Austtalia ~ew Zcalant.l-l:onloll Golch Lld.; South Africa-Central... ~ Agency Publi!:lher'~ subscription (including UK 3'i!o. Sole AcetitK 3 ~5. Oversells for c r.<j ca~ i'- AiMMlin - 3;j. Sj. iitcraational ami Sew ZL-afatiJ OorJnn nternational Olro Giro facilities Accuuni Uylcb Account So. No. 5i*J"J007.1'kose (Asia) Lid.; JJonlh 5 1 '2~007. 'Jeasc "tatn Africa Central state reason foe for payment News Agv&ey "niewaga Ltd. "message to FubllslierVsutMCTiptioii payee". FtucncAi. PRACTCAL U'utnxM rate (ncludicir Wnn;,ES!4 1? is rcld sold Mbjecl postage): subjcct io tu ibe for the following one year folluwing condllienf, conditions, namcly hat il,.: hall not. without written com;cnt the Publi!thers li r!it having bcen cnt. rc901{1. hircd ont otherwine way than hu the tecoiiinu'iulcd pamoly rccommcntlc,1 wllinif ibat U sc ll~ priec s]i;iu pricc shown ri«t, whlwut on llic the thc cover, wrilien cm cr. tsclinline consent l xdnt.lin~ Eire of where be PuMHitrsllrd flic the Kclllnif!jclling price baviaig prke s is mbject been given, subjc<:t m to V.A.T., bek-nt, Y.A.T., resold, an.1 thai that t hired it shall out j;hallnot. not or be otlicrwine cid, Jell t. mold, disposed resold, blrcd of hired out by or w»v otherwise of Trade othcn, il'e dispocd at more d ispo!'cd «d lhan or in b a nmlltalcd llutilal c.j cori'lukon condition i«p ~, r n ill any unxnthorlwd unauthorised cover co\"e r by hy way wa~ nf of Trade Tr:\o c or nr allixot atllxed lo to or a* as purl Jart. oi of any :lly pniilivntiuti ]lublil"at ioll or udvertjslaip. advertising", iierary ilt'rary or plcir»rjaf pictorial rwalfer mattcr whaianrvcr. whatsocn'j'. Certificate course includes a learn while you build 3 transistor radio kit. Everything you need to know about/?arf/o & i CUTOUT THS COUPON! Work* L.-

100 enif its LARGEST SElECTON SELECTON OF ElECTRONC ELECTRONC COMPONENTS AND EQUPMENT. LOW PRCES- MEAN LESS VAT. TEST FOJPMPWT EQUPM~_~ NTEGRATED CRCUTS CRCUfTStJi ( Yl You can build tbe the Texan Stereo FM Tuner MULTMETERS" MULTMETERS^ ^ 74 SERES & LNEAR T 1 Carr/packing Ca rr/pa ckl ng M TEXAN 20 + T 20 WATT C STEREO AMPLFERS 35d) 35p) P p Sr^rai-v SemlconductorB Any EXTRA DSCOUNTS Semiconductors-Anyone one type ^^ or mixed SN74 5N74 Series J kQ/V 0 V 'C', 12-extra 10%; 25-extra 15%: 100-extra 20%_ Features glass Gardners transformer, with 9 25 p. p p FeBtuies Qlasa fibre PC board, Gnrdnars low field tfaosformer, wiib 6-C's. 10 transistors etc. 20kO/V wilh 0 16 SN7485N.1 63 SN74191N 2 00 S-lC's, lo-lraoslslors plus diodes, elc. Designed by Texas v J435 case 20kfl/V 9*25 wllb 'M- ^ ^ A SN7400N 0-16 SN74fl5N engineers for steel 8' nstruments englncors lor Henry's, P.W Supplied sleetcase ^'5 SN7401N 0-t SN7486N SN74t9TN D SN74192N 2*00 full hbook J431320kO/Vwilh SN7402N 0 16 SN7489N with loll chassis work, detailed construction hbcok all» J kQ/Vwith ( ) SN7<02N 0*16 SN7409N 3*87 SN74193N 2 00 necessary part*. parts. Full nput input control facilities, facilities. Slablllaed Stabilised sleel case «2*50.2' SN7403N 16 SN7490N SN7400N 0* SN74194N * ~ " x 61" opmated. 200/V with 16 SN7404N 0 26 SN7491AN supply. Overall size Si" * 21" x 65" mains operated. Free J /7 wllb cast 16 M SN74MN 26 SN74gi leak sleeve with every kil SOp). (also built 33kO/V ran SN74196N 20 tm*iiem wiih wt*nt (Carriage 50p). J k D/V plus tran- SN7405N 0 22 SN7492N AN 100 0*70 SN74195N SN74t9fiN 1 10 tested sistor steel case 10' SN7406N SN7493N,0 0*70 70 S 1*20 SN74197N ) U kn/V 20kll/V plus 1kHx 1kHz SN7407N O 42 SM7494 SN7494N N SN7419BN N N 1 SN74198N 77 OSC with case SN7408N 0 28 SN7495N SK74199N 2 SN74199N 2 52 i HENELECStereoFM Tuner Features Fealures capacit* capacity T-2 2Qka/V 20kO slim type ype SN7409N SN7496N 5N7496N 0* RCA 2*52 ReA 1 diode tuning, tuning, lead tuning moter meter (ndlcalors, indicators, THL330 THL33D (L330X) (L33DX) 2kn/V 2kO/V SN7410N D SN7497N supply-mains i stabilised power suppty mains operated. High Robust oerlormbnce performance senslllylty sensitivity with unique station TP5SN TP5SN20kO/V(Case 2) 2Ckn/V (Case 2) 7» 8*25 SN7411N 0-25 SN74100N 3 1-»9 87 CA SN7412N 0* SN74t04N SN74104N CA3014 1*32 CA f- indication ndication C stereo decoder. Overall site size n in teak TP10S WkOfV 2OkO/V SN7413N 0* SN7410SN SN74105N 0*53 CA301B 1B ' w aleflve sleeve S" 8" * x Zi" 2!" x 62", 6{-" Complcla Complete kit with toak teak sleeve TW20S 20hll/V 20kll/V M SN7414N 0* SN74107N.0*45 CA3019 1*02 1* ) (also built TW50K TWSOK 50k SOkO/V Q/V SN7418N SN7416N 0* SN74110N CA3020 CA3022 1*80 1* (Carriage arrjage 50p). p. <fm'«v lesled 24 95) S 1 EP10KN EP10Kr-/l0kl/V 10kn/V SN7417N SN74111N 0 86 CA3028A 1 03 AFt05 AF105 50kO/V SOkO/V Deluxe SN7420N 0* ) 12 SO SN742" SN74118N 90 CA JON THE LARGE BAND OF HAPPY CONSTRliaORS! CONSTRUCTORS! (case 1-90) 50 S100TR SOOTR 100k lookll/v n/v plus 1 SN74116N 1* CA3OT8A CA DJ 1*06 N 0*33 SN7411SN 0 CA304S 0*70 SN7422N SN74119N translstcr transistor tester 22*50-50 SN7423N 0* SN74120N *95 CA CA SN7425N 0-3? 0 37 SN74121N O 0 50 SO CA3O01 CA * SN74122N 0 70 CA3089E 2 9. TRANSSTORSED EM SPEAKERS NEW REVOLUTONARY SN7426N 0* SN74123N p MODULES SPECAL SUPERTESTER 680R SPECAL 8. ^ SN7427N 0-37 SN74t23N N *00 CA3C89E 2*94 CA Slgn.tlc. 680R Multl-esler SN74132N 0 72 NE Tuners - Pownr Power Supplies - Amplifiers PURCHASE W^ J9 630ft Mulll-tesler 18 SN7428N 0 «SN77125N 3 N _~ 1 tte40 AC Multlvoltmater Multivoltmeter 19*75 SN7430N 0*16 N 0*72 0*65 Signetks NFS NE560B 4 SO ttet SN74145N channel in. x in kHz-28mHz 19 5O stated) AMPLFERS (All single channot unless 0 37 SN74150N.1 75 NE562B 4 SO P! 13 Jn-, 8 n. [ Qfel J ftels Grid dip meter SN7432N 0-37 SN74141N (bass chassisspeakers s speakers 6\ '. 'R 1 44(JXHr-2SmHz SN7433N 0-37 SN7414SN 1*26 0*90 NESflOB NE561B *50 i SN7438N NE567B yplt 300 MW 1-75 (Carr./oacklng 1 75 (Carr./packing ftv " /B tte65 28 Range valve SN7437N 0*37 5N74t50N ' SN74153N * 2004 volt vol MW p each of 50d voltmeter 22*50 SN7436N 0-37 SN74151N 1*00 1*75 NE&626 50p tte20d 0 92 SN74154N 2 00 MC303L volt 1 wall HQ ttemd RF Generator SN7440N 0-22 N 0*95 NE567S 4-50 Motorola 2* pr.) 120kHz 500mHz -95 SN7442N 0 79 SN74155N 1 00 MC304P volt3watt 3* TC10 watts imkhr-soomhr 18 9S SN7441AN 0*92 SN74t54N tte22d 1 27 SN74156N volt 3 watt 4.( TO to i 68 ohms twin cone C2*20 ttez20 AF Generator 5N7442N 0*79 SN7415SN *00 MC1303L MC1304P 1 1* ,20 20Hz-200kHz ST 12 volt voll 11-t- t + U t watl watt 5* ' 10 watts 4. 4, 8, 15 20Hz-2MkHr 19*95 SN7443N 127 SN74t56N HM350 tran 1 60 SN74160N 1 31 MC1711CC 60 El E volt voll 5 wall watt 5T0 ohm 5 10 uhm with twin tweeters HM350 in circuit tran- SN7444N 1*27 SN74157N 0*95 1*00 MC1310P MC1358CF sistortester ' SN74161N ~ 24 volt 10 wall 4* nnd crossover '85 each slsior tester 19-M SN7445N 1-60 SN741MN C SN74162N 31 MFC4010P voll 10 watt 4* EW 15 wall watt 68 ohms wllb C3025 Deluxe meter SN7446N 1*89 5N74161N 1*38 1*38 MC 7t CC D-BD MFC4000P with 1-3OOmHz volt 30 watt 99' 55 tweeter l-300mhz 6*95 SN7447AN 1-60 SN7462N 1*38 MFC4C10P 9* TT14S ran 0 16 SN74164N 1 76 Olhers Z40 30/35 voll volt 15 watt 5* : wall watt 8. S 15 Ohm TT145 Compact tran- SN7448N 1-27 SN74163N 1 38 MFC6040P 1*00 ohm sistor -15 N 0 16 SN74165N 1 76 TBA800 SO 260 Z60 45/50 SO voll 25 watt wait 685 wllb 6 95 with tweeter 7* each slator tester SN7450N 0*16 SN741&4N 1-76 Others SO SAflai7 SA voll volt *20 'Polished wood cabinet tg3-36 R/C osc. 20Hz- SN7451N 0*16 SN7465N 200kHz : elc. 3Sp 1, 4-80 carr., etc. 35p each or 200kKz 19*75 SN7453N 0-16 SN74166N TBA80C 1H SN76003N 150 C3042 Mele r Amplifiers with cantrals 50p controls SOp pair. C3042 SWR Meier 5*75 SN7454N 0-16 SN74167N 3-00 SN72741P SESSOA SE350A Do-lu*e De luxe signal SN7460N 0*16 SN74170N 2 52 SN72748P g-6o 0* C 0 75 E volt 2f 2, walls watts 68 ohm# ohms 6-25 tracer SN7470N 0-36 SN74173N ZC 0*75 12' ft500 RSOO Main# 65 wans watts 4-16 obma 6* ' l : i =-i'., j ~ j ~-S SE4CO 'SE400 Mint-lab Minl lab ell all Jn SN7472N 0-38 SN74174N 1*57 709C 0*39 n 0 SN74175N SAC14 Mains watts 8 ohms 11* C 0 45 SAC30 UHF Mains waits ohms 14* line receiver UKF one tester 15*50 SN7473N 0*41 SN74t75N C-5 5oo,OOOKHz CAO30 (carr_ ' CA038 9 volt voll H t + U t watts 8 ohms 6*95 transistorised tuners U K Cl-5 Scope SOO.OOOKHz SN7474N 0*42 SN74176N S 723C 0* SN74180N CAOB8 (Post/ C3043 CA volt wattv watts 68 obms ohms 10*50 operation. Br new. (Poslf (carr. 1*00) «3*M SN7475N 0*59 SN74177N 1-26 TZflC SN7480N packing 2Sp. 25p. each). * CH F/A meter SN7476N 0*45 SN741MN 1-2S 741C 0 M 1-3ooMHz 5 75 SN7481 N FM 2,50 R"stancesub box} P'st etc Modules TYPE C variable tuning 2* MHz 5*75 SN748CN 0 60 SN74181N TYPE B 4-bu(lon 4abutton oush-button R'stancesub box " P'sletci-M SN7401N 1-10 SN74182N 3-95 t *26 748C 747C 1-00 LM309K 0* pushabutton Capacitator SN74185N 1 80 SnclalrlC12, Mullerd Mullard LP tm FM tuner tuner(tront (from end) with (adjustable) (adjuslable) SO Capacltafor / 20p 2 TO SN7482N 0 SN74184N data dala MHZ O/P < amp variable trans- SN7483N 1*10 SN741B5N *80 1*80 TAA formers (carr Mullard Cosmos ntegrated Circuits. Full in M~~~~d LP 11fl MHZ F unit with formera (cerr. 1) B SS SN7484N SN74190N 2*00 6w Sinclair amp Ct2. 2*20 LP MHZ F unit with NO PA.DSCOTHEQUE activity data «-M PA-DSCOTHEQUE Radio acllvlly counter Co*mo» fntegrated Circulla Range AAZ BLY Oat " Gorier AC BSX Pormabllity Permabillty FM tuner luner {front (fronl end) 0-1 Or (carr. 1) 9 TP42A n Slock 0* unit 10 7 MHZ O/P 4^20 LGHTNG EQUPMENT Mains unll for above TS AC BU , 0 22 {carr.sop) 1~0 _7_M~H~Z~O~/~P. (carr. 3*75 V405A 0* ZTXOS CM FM AM Tuners Oecoden Decoders TAPE HEADS ~g~~~ n~ :m~ ~:n ZTX300 fmgg 0-13 ~ : ~; FM523T FM5231 (tu (u 2) 86 vou voll fm tuner luner 7' Marrlot Marriol XRPSf17i XRPS/l1t Track ~git: n: gils~3 ~:~~. 21X302 0*18 nm~ ~ :-U TU312 vou volt version (FM use with Decoder) High TXS AD GETlll N SD Slereo Stereo Decoder for Tu 3-1Z 3 12 volt MHrrio! Marriol XRPS/18 XRPS/lBt i Track 2NH7 0*16 AD GET SPfi2H SP62H 6 voll slereo stereo FM tuner W-RO 14'80 Med N706 0*12 3 SO AF GET AlOfl? Aloo1 9 volt voll MW-AM Wlthoul doubl besl Marriol XRPS/3H AF LM309K Sinclair Slnclair t?/45 12/45 volt FM tuner stereo Wliboul doubt U.K.'s best Marrlot XRPS/3$ i Track 2N930 range of rnodulor modular complete Med N AF MAT recorder for above equipment. Lighting, Marriat t AF MJE i 2N A1018 Al0t89 9 volt FM tuner n cabinet 13-9S BQulpmont. LlgKiing, mixing, Marrlot XRPS/63 i Track 2N1132 0*24 95 microphones, accessories AF MJE \ 2N A1005M A1OO5M (S) fl voll volt Stereo decoder FM mtcrophoneb, accessories, High 1-75, 2N Marriot ASY MJE for above 7-50 speakers, amplifiers, lenses, Marrlot Erase Heads for 2Niei3 7 '. etc. (XES11) BAlS 0 10 MJE Z l06z volt Sleteo Stereo decoder general etc., elc. XRSP 17/18/36 {XES11) 75p 2N1671 lists 18) Marrlol 343lTrack BAX MPF :;.p~ur.:;p~os;.;e;... purpose 4'SO FREE stock llsls (Ref. No. S) Marrlot BXZE 343 {Track 2N2147 0*78 6_._50 on ~o~e~'bej~~~llfl;r request CALL N AND SEE erase, 75p BC NKT R/RPl Rec d/plad BC OA N Preamplifiers FOR YOURSELF el R/RP1 Rec'd/PTay i Track 45p 2N2926 2N2160 S'gle BC OA Sinclair ~r:~~~i~:;:eo Stereo M 60 Preamplifier Preamplifler 6-7S & 75 HENRY'S HENRY'S DSCO DSCO CENTRE. HRP S'Qte Tr'k Rec/Play 35p 3N3053 0*12 CENTRE, Bogen UL290 1'50 BC109C 0 16 OA El300 E1300 CarliTape Carl/Tape Mlc Mic nputs npuls 09 volt D9 EDGWARE ROAD. Bogcn Type UL2S0 Erase 1-50, 2: EDGWARE ROAD. Stereo Casa BC OA E1310 Slereo 3-30 mv mal cart 9 volt 4-75 TEL Miniature Storso Cas- 2N3055 2N TEL eolte seue Rec/Play 22' 25 2N BC OC N3442 1* FF3 Stereo 3 mv tape head 9 volt ' 1250-WATT '.,.. r... BC OC Stereo 5-20 mv Mag. cart. 1250'WATT LGHT EXCLUSVE, 2N3525 C*91 BC OC mains DMMER SO pp 20p 2N " Vt" BC169C 0 15 OC EQ25 Mono mv Tape/Cart/Ray Tape/Cart/Flay Manufactured by Ultra Ltd. S WATT C 2N plate & inst....'r't.; BC OC volt 1"95 Supplied with plaieknob ilnst, AMPLFERS "'ll.r 2N3714 BCY OC N Special purchase watt oulput BCT OC N Power max_ Supplies Mains nput DENSH BOARD KTS So acla' pu 5 wall output 2N3771 BCY OC N p { chassis-rest cased) P 8-16 ohm load. 30 volt max. i 2N *77 complete BCY OC C6/7i/9V 50 for BCY OC N ~;~~~~;!~~~~~a~~d~ith 300 MA with ad'ra rs 2-25 SH-2A 2 25 ~~:~~ 18 ~~P~~~j;~~s Projects 7*70 DC operation, complole with 2N ,85. P500 BCY OC voll 500 MA 3-20 SR-SA 100 Projects data. Price 1*50 each or 2 lor 2N ST Projecls SO HC244R BD OC ~~~4~~ 3,'6/7i/9v, f~~tt~~. 400 ~oo MA stabilised T-45 4S Prolecls 10 M N MA slabllised n~ ST-loo 100 Projecls Pit 2v. i amp, 3*30 3*30 ST-i oo ioo Projects 13*20 Printed Circuit Panels SOp. 2N4002 2N3903 BD OC2oo "Pi 5 SflV, ^ amp 3*30 CALCULATORS 2N4126 0*15 BF OC Pl080 Sinclalr Cambridge BF OCP N PtCS :~~g~8rij 45V t2v1a4 0*9A,a:~ ' : : 70 ~g TURNER ;O~~~~: p~li!~s KTS Sinclair Carnbrldge 2N4871 0*34 10 n t 10 Projects Kit [grcnl 2 N *30 BF ORP S ;r,~o:1-t~~. oa.~~1 n~ Projecls 15 Pt2 4H2V. 0*4-1 amp 7 *5 50 n 1 50 Projects 15*45 Sinclair Cambridge 2S3C3 OM BFX ORP SElOS SE101S 3/6/9/12V. 51 amp stabilised 12-7S SO n 1 SO Projects 23-6S ' in 1150 Projects 65 (Built) BFX P346A * Memory P107fl 3/4}W7+/fl/l2V.-tamp 4-20 Sinclair Mamory -r BFX TL SEBOOA ~~~1't!/g 1-15 VOLT /~~ri20~j.i 0-JA stabilised as~ilised n~ RADONC r =-:-==-:-:-:= RAD ONC KTS MJ BFY TP29A 0 45 O SO X2O20 X2020 Projecls Sinclair Projecls 5 70 Scientific TT'.tT *50 BFY TP30A f_ ALL PRCES SUBJECT TO VAT _ 40 Projecls 2& BFY TP31A (all prices subject to vat) X40 40 ProlBCle 26*95 H.f'H X40A ADD-ON Sinclair Sincialr Sclcnllflc Scientlflc BFY TP41A Kit SEND FOR FREE LST No. 36 Henr.!'s Electronic Centres Electronic ElectrOnic Components & E< Liipmen101 EqUpment Hi H Ft F 309 PA-Disco-Lighting PA-O,sco- L,ght,ng High Hgh Power Sound Electronics ElectrOnics RADO SpeCal bargains Henrys ram 303 Special offers bargains store Centres Open Ail All mail to 303 Edgware EdgwareRoad Road. London W2 W21BW JBW 99am - 66pm EDGWARE ROAD. W2 Prices correct at time of preparation. Subject to change without Without notice. E&O.E E &0 E EDGWARE ROAD. W2