C220 PRELIMINARY TUBE PREAMPLIFIER SERVICE MANUAL. SERIAL NO. WS1001 And Above C220. Serial Number W S1001 And Above CONTENTS

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1 Performance Specifications... 2 Notes... 2 Rear Panel... 3 Section Location... 3 Block Diagram Interconnection Diagram Main Schematic and PCB C220 TUBE PREAMPLIFIER CONTENTS Display Schematic and PCB Balanced/Data Sch and PCB Pushbutton Sch and PCB Headphone Sch and PCB Parts List Repacking Instructions C220 SERIAL NO. WS1001 And Above PRELIMINARY SERVICE MANUAL Serial Number W S1001 And Above

2 Frequency Response +0, -0.5dB from 20Hz to 20,000Hz PERFORMANCE SPECIFICATIONS Headphone Output Impedance 16 ohms to 250 ohms Total Harmonic Distortion 0.08% from 20Hz to 20,000Hz Main Output 2.5V for rated input Maximum Voltage Output 8V RMS Unbalanced, 16V RMS Balanced Sensitivity (for rated output) High Level, 450mV unbalanced, 900mV balanced Phono, 4.5mV Signal To Noise Ratio (A-Weighted) High Level, 90dB below rated output Phono, 80dB below 10mV input Input Impedance High Level, 22K ohms Phono, 47K ohms; 65pF Maximum Input Signal High Level, 5V Unbalanced, 10V Balanced Phono, 50mV 1,000Hz) Output Impedance 250 ohms Voltage Gain High Level to Tape Output: 0dB High Level to Main Output: 15dB Phono to Main Output: 55dB Tube Compliment Phono Circuitry: 2-12AX7A High Level Circuitry: 2-12AX7A Power Requirements 100 Volts, 50/60Hz at 75 watts 110 Volts, 50/60Hz at 75 watts 120 Volts, 50/60Hz at 75 watts 220 Volts, 50/60Hz at 75 watts 230 Volts, 50/60Hz at 75 watts 240 Volts, 50/60Hz at 75 watts Note: Refer to the rear panel of the C220 for the correct voltage. Overall Dimensions Width is 17-1/2 inches (44.45cm) Height is 6 inches (15.24cm) including feet Depth is 18 inches (45.72cm) including the Front Panel, Knobs and Cables Weight 21.1 pounds (9.59 kg) net, 37.5 pounds (17.05 kg) in shipping carton Shipping Carton Dimensions Width is 26-1/2 inches (67.3cm) Depth is 24-1/4 inches (62.2cm) Height is 11-3/4 inches (29.9cm) NOTES 1. The heavy notes on the schematic denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the schematics are measured under the following conditions: a. AC input at 120 volts, 50/60Hz. b. All voltages are +/-10% with respect to ground. A high impedance (10 megaohm) voltmeter must be used. 3. Unless otherwise specified: a. Resistor values are in ohms. b. Capacitor values are microfarads (uf). c. Inductor values are in microhenries (uh). 4. On PC board drawings, Square pad indicates: a. Polarized Capacitors - Positive b. Diodes - Cathode c. Others - Pin 1 5. WARNING Parts marked with the symbol have critical characteristics. Use only replacement parts recommended by the manufacturer. 2

3 REAR PANEL C220 SECTION LOCATIONS TOP VIEW WITH COVER REMOVED 3

4 NOTES 4

5 BLOCK DIAGRAM C

6 INTERCONNECT 7 8

7 2 MAIN SCH 1 OF 4 C

8 2 MAIN SCH 2 OF

9 2 MAIN SCH 3 OF 4 C

10 2 MAIN SCH 4 OF

11 2 MAIN PCB C

12 3 DISPLAY SCH 1 of

13 3 DISPLAY SCH 2 of 3 C

14 3 DISPLAY SCH 3 of 3 and PCB 23 24

15 4 BALANCED / DATA SCH 1 of 2 C

16 4 BALANCED / DATA SCH 2 of

17 4 BALANCED / DATA PCB C

18 5 PUSHBUTTON SCH and PCB 31 32

19 6 HEADPHONE SCH and PCB C

20 NOTES 35 36

21 2 PARTS LIST MAIN PCB Ref No. Description Part No. C1 CAP ELECT 10UF 50V C2 CAP MPF 0.1UF 630VDC C3 CAP MONO 47PF 200V 10% NPO C4 CAP MONO 47PF 200V 10% NPO C5 CAP ELECT 22UF 100V C6 CAP POLYPROP 1UF 20% 250VDC C8 CAP ELECT 10UF 50V C7 CAP ELECT 1UF 50V C9 CAP ELECT 47UF 35V C10 CAP MONO 47PF 200V 10% NPO C11 CAP MONO 47PF 200V 10% NPO C12 CAP MONO 1000PF 50V 10% NPO C13 CAP MONO 1000PF 50V 10% NPO C14 CAP MONO 1000PF 50V 10% NPO C15 CAP MONO 1000PF 50V 10% NPO C16 CAP ELECT 10UF 50V C17 CAP ELECT 47UF 35V C18 CAP DISC MONO.47UF 50V C19 CAP MONO.1UF 50V 20% Z5U C20 CAP MONO.1UF 50V 20% Z5U C21 CAP ELECT 47UF 450V C22 CAP ELECT 47UF 35V C23 CAP ELECT 47UF 450V C24 CAP ELECT 1UF 50V C25 CAP MONO.1UF 50V 20% Z5U C26 CAP ELECT 10UF 50V C28 CAP MONO.1UF 50V 20% Z5U C29 CAP ELECT 10UF 250V C30 CAP ELECT 4700UF C31 CAP MONO 220PF 200V 10% NPO C32 CAP MONO 1000PF 50V 10% NPO C33 CAP MONO 1000PF 50V 10% NPO C34 CAP MONO 1000PF 50V 10% NPO C35 CAP MONO 1000PF 50V 10% NPO C36 CAP MPF 0.1UF 630VDC C37 CAP ELECT 10UF 50V C39 CAP POLYPROP 1UF 20% 250VDC C40 CAP ELECT 1UF 50V C41 CAP ELECT 47UF 35V C42 CAP MPF 0.1UF 630VDC C43 CAP ELECT 10UF 16V C44 CAP MONO 220PF 200V 10% NPO C45 CAP MONO 47PF 200V 10% NPO C46 CAP POLYPROP 1UF 20% 250VDC C47 CAP ELECT 1UF 50V C48 CAP ELECT 100UF 25V C49 CAP ELECT 10UF 16V C50 CAP MONO.1UF 50V 20% Z5U C51 CAP ELECT 100UF 25V C52 CAP ELECT 10UF 16V C53 CAP PF 0.001UF 5% 63VDC C54 CAP MPF UF 5% 63VDC C55 CAP ELECT 10UF 16V C56 CAP MPF 0.1UF 630VDC C220 Ref No. Description Part No. C57 CAP ELECT 10UF 16V C58 CAP MONO 47PF 200V 10% NPO C59 CAP POLYPROP 1UF 20% 250VDC C60 CAP ELECT 1UF 50V C61 CAP ELECT 10UF 250V C62 CAP ELECT 100UF 25V C63 CAP ELECT 10UF 16V C64 CAP ELECT 100UF 25V C65 CAP ELECT 10UF 16V C66 CAP PF 0.001UF 5% 63VDC C67 CAP MPF UF 5% 63VDC C68 CAP ELECT 10UF 16V C69 CAP ELECT 10UF 16V C70 CAP MONO 100PF 100V 10% NPO C71 CAP ELECT 10UF 16V C72 CAP MONO.1UF 50V 20% Z5U C73 CAP MONO.1UF 50V 20% Z5U C74 CAP MONO 100PF 100V 10% NPO C75 CAP ELECT 10UF 16V C76 CAP MONO 100PF 100V 10% NPO C77 CAP ELECT 10UF 16V C78 CAP ELECT 10UF 16V C79 CAP ELECT 10UF 16V C80 CAP MONO 100PF 100V 10% NPO C81 CAP ELECT 10UF 16V C82 CAP MONO 100PF 100V 10% NPO C83 CAP ELECT 10UF 16V C84 CAP MONO 100PF 100V 10% NPO C85 CAP ELECT 10UF 16V C86 CAP ELECT 10UF 16V C87 CAP MONO.1UF 50V 20% Z5U C88 CAP ELECT 220UF 50V 20% C89 CAP POLYPROP.047UF 10% 250VDC C90 CAP ELECT 220UF 50V 20% C91 CAP MONO.1UF 50V 20% Z5U C92 CAP ELECT 1UF 50V C93 CAP ELECT 2200UF 50V 20% C94 CAP MONO.1UF 50V 20% Z5U C95 CAP ELECT 10UF 50V C96 CAP ELECT 2200UF 50V 20% C97 CAP ELECT 10UF 50V C98 CAP MONO.1UF 50V 20% Z5U C100 CAP POLYPROP.047UF 10% 250VDC C102 CAP ELECT 10UF 50V C103 CAP MONO.1UF 50V 20% Z5U C104 CAP MONO.1UF 50V 20% Z5U C105 CAP MONO.1UF 50V 20% Z5U C106 CAP POLY.047UF 10% 1000VDC C115 CAP ELECT 47UF 35V C116 CAP ELECT 10UF 50V C118 CAP ELECT 10UF 50V C119 CAP ELECT 10UF 50V C121 CAP MONO.1UF 50V 20% Z5U C122 CAP MONO.1UF 50V 20% Z5U

22 PARTS LIST con t MAIN PCB (cont d) Ref C123No. Description CAP ELECT 10UF 50V Part No. C125 CAP MONO.1UF 50V 20% Z5U C126 CAP MONO.1UF 50V 20% Z5U C127 CAP ELECT 10UF 50V C128 CAP ELECT 10UF 50V C129 CAP ELECT 47UF 35V C130 CAP ELECT 10UF 50V C132 CAP ELECT 10UF 50V C133 CAP ELECT 10UF 50V C134 CAP MONO.1UF 50V 20% Z5U C135 CAP MONO.1UF 50V 20% Z5U C136 CAP ELECT 10UF 50V C145 CAP ELECT 10UF 50V C146 CAP ELECT 10UF 50V C147 CAP ELECT 47UF 35V C148 CAP ELECT 47UF 35V C149 CAP MONO 220PF 200V 10% NPO C150 CAP MONO.1UF 50V 20% Z5U C152 CAP MONO.1UF 50V 20% Z5U C155 CAP MONO.1UF 50V 20% Z5U C151 CAP ELECT 10UF 50V C153 CAP ELECT 10UF 50V C154 CAP ELECT 10UF 50V C156 CAP ELECT 10UF 50V D1 DIODE SIL A D2 DIODE SIL A D3 DIODE SIL A D4 DIODE SILICON D5 DIODE SIL A D6 DIODE SIL A D7 DIODE SIL A D8 DIODE SIL A D9 DIODE SIL A D10 DIODE SILICON D11 DIODE SIL A D12 DIODE SIL A D13 DIODE SIL A D15 DIODE SIL A D14 DIODE SILICON D16 DIODE SILICON DS1 LED GREEN 3MM HI INTENSITY DS2 LED GREEN 3MM HI INTENSITY DS3 LED GREEN 3MM HI INTENSITY DS4 LED GREEN 3MM HI INTENSITY F2 FUSE 2A 250V SLO-BLO 5X20 IEC (F2) HOLDER FUSE 5X20MM PCB MOUNT F4 FUSE 1/8A SLO-BLO 5X20 IEC (F4) HOLDER FUSE 5X20MM PCB MOUNT F5 FUSE 0.5A SLO-BLO 5X20 IEC (F5) HOLDER FUSE 5X20MM PCB MOUNT GP1 BRACKET PCB CARD MOUNTING GP2 BRACKET PCB CARD MOUNTING J1 CONN FFC 18PIN J2 JACK PHONO 6P GOLD PLATED Ref No. Description Part No. J3 JACK PHONO 8P GOLD PLATED J4 CONN FFC 18PIN J5 CONN FFC 18PIN J6 JACK PHONO 8P GOLD PLATED J7 CONN 12 PIN FFC J8 CONN FFC 18PIN J9 HEADER 9 CIRCUIT POST NATURAL J10 BLADE FASTON W/FEET J11 BLADE FASTON W/FEET J12 CONN PCB MOUNT POWER RED J13 CONN PCB MOUNT POWER RED J14 CONN PCB MOUNT POWER RED J15 CONN PCB MOUNT POWER RED J16 JACK PHONO GOLD PJ261G J41 CONN FFC 18PIN K1 RELAY REED SPST-NO 5V 1.2A K2 RELAY REED SPST-NO 5V 1.2A K3 RELAY REED SPST-NO 5V 1.2A K4 RELAY REED SPST-NO 5V 1.2A K5 RELAY REED SPST-NO 5V 1.2A K6 RELAY REED SPST-NO 5V 1.2A K7 RELAY REED SPST-NO 5V 1.2A K8 RELAY REED SPST-NO 5V 1.2A K9 RELAY REED SPST-NO 5V 1.2A K10 RELAY REED SPST-NO 5V 1.2A K11 RELAY REED SPST-NO 5V 1.2A K12 RELAY REED SPST-NO 5V 1.2A K13 RELAY REED SPST-NO 5V 1.2A K14 RELAY REED SPST-NO 5V 1.2A K15 RELAY REED SPST-NO 5V 1.2A K16 RELAY REED SPST-NO 5V 1.2A K17 RELAY REED FORM 1C 5V 125 OHM K18 RELAY REED FORM 1C 5V 125 OHM K20 RELAY 24VDC 5A 277VAC K21 RELAY REED SPST-NO 5V 1.2A K22 RELAY REED SPST-NO 5V 1.2A K23 RELAY REED SPST-NO 5V 1.2A K24 RELAY REED SPST-NO 5V 1.2A K25 RELAY REED SPST-NO 5V 1.2A K26 RELAY REED SPST-NO 5V 1.2A K27 RELAY REED SPST-NO 5V 1.2A Q1 TRANSISTOR N JFET Q2 TRANSISTOR N JFET Q3 TRANSISTOR N JFET Q4 TRANSISTOR N JFET Q5 TRANSISTOR PNP SILICON Q6 TRANSISTOR PNP SILICON Q7 TRANSISTOR PNP SILICON Q8 TRANSISTOR PNP SILICON Q9 TRANSISTOR PNP SILICON Q10 TRANSISTOR PNP SILICON Q11 TRANSISTOR PNP SILICON Q12 TRANSISTOR PNP SILICON Q13 TRANSISTOR N JFET

23 MCD201 C220 PARTS LIST con t MAIN PCB (cont d) Ref No. Description Part No. Ref No. Description Part No. Q14 TRANSISTOR N JFET Q15 TRANSISTOR N JFET Q16 TRANSISTOR N JFET Q17 TRANSISTOR NPN POWER (Q17) HEATSINK TO Q19 TRANSISTOR PNP SILICON Q29 TRANSISTOR PNP SILICON Q21 TRANSISTOR NPN POWER Q22 TRANSISTOR NPN 2A 50V Q23 TRANSISTOR NPN 2A 50V Q18 TRANSISTOR NPN SILICON Q24 TRANSISTOR PNP Q25 TRANSISTOR PNP Q26 TRANSISTOR NPN SILICON Q27 TRANSISTOR PNP Q28 TRANSISTOR N JFET Q30 TRANSISTOR N JFET Q31 TRANSISTOR PNP Q32 TRANSISTOR NPN SILICON Q20 TRANSISTOR NPN R1 RES MF 20K 1% 1/4W R2 RES MF 150K 1% 1/4W R3 RES MF 221K 1% 1/4W R4 RES MF 200K 1% 1/4W R5 RES MF 2.74K 1% 1/4W R6 RES MF 2.21M 1% 1/4W R7 RES MF 47.5K 1% 1/4W R8 RES MF 33.2K 1% 1/4W R9 RES MF 24.9K 1% 1/4W R10 RES 16.5K 1% 1/4W R11 RES MF 100K 1% 1/4W R12 RES MF 1M 1% 1/4W R13 RES MF 10M 1% 1/4W R14 RES MF 10M 1% 1/4W R15 RES MF 10M 1% 1/4W R16 RES MF 10M 1% 1/4W R17 RES MF 1.5K 1% 1/4W R18 RES MF 3.32K 1% 1/4W R19 RES MF 10K 1% 1/4W R20 RES MF 267K 1% 1/4W R21 RES MF 22.1K 1% 1/4W R22 RES MF 12.1K 1% 1/4W R23 RES MF 15K 1% 1/4W R24 RES MF 267K 1% 1/4W R25 RES MF 1M 1% 1/4W R26 RES MF 267K 1% 1/4W R27 RES MF 1M 1% 1/4W R28 RES MF 267K 1% 1/4W R29 RES MF 1M 1% 1/4W R30 RES MF 267K 1% 1/4W R31 RES MF 1M 1% 1/4W R32 RES MF 267K 1% 1/4W R33 RES MO 100K 5% 2W R34 RES MF 10K 1% 1/4W R35 RES MF 1.5K 1% 1/4W R36 RES MF 267K 1% 1/4W R37 RES MF 12.1K 1% 1/4W R38 RES MF 267K 1% 1/4W R39 RES MF 267K 1% 1/4W R40 RES MF 267K 1% 1/4W R41 RES MF 267K 1% 1/4W R42 RES MF 1K 1% 1/4W R43 RES MF 1K 1% 1/4W R44 RES MF 1K 1% 1/4W R45 RES MF 1M 1% 1/4W R46 RES MF 1M 1% 1/4W R47 RES MF 221K 1% 1/4W R48 RES MF 200K 1% 1/4W R49 RES MF 1M 1% 1/4W R50 RES MF 1M 1% 1/4W R51 RES MF 3.32K 1% 1/4W R52 RES MF 2.74K 1% 1/4W R53 RES MF 20K 1% 1/4W R54 RES MF 1K 1% 1/4W R55 RES MF 150K 1% 1/4W R56 RES MF 1M 1% 1/4W R57 RES MF 1.5K 1% 1/4W R58 RES MF 3.32K 1% 1/4W R59 RES MF 47.5K 1% 1/4W R60 RES MF 33.2K 1% 1/4W R61 RES MF 2.21M 1% 1/4W R62 RES MF 24.9K 1% 1/4W R63 RES 16.5K 1% 1/4W R64 RES MF 22.1K 1% 1/4W R65 RES MF 10M 1% 1/4W R66 RES MF 10M 1% 1/4W R67 RES MF 10M 1% 1/4W R68 RES MF 10M 1% 1/4W R69 RES MF 15K 1% 1/4W R70 RES MF 221K 1% 1/4W R71 RES MF 200K 1% 1/4W R72 RES MF 1K 1% 1/4W R73 RES MF 1K 1% 1/4W R74 RES MF 1K 1% 1/4W R75 RES NETWORK 2 X 220K ISO R76 RES MF 1M 1% 1/4W R77 RES MF 47.5K 1% 1/4W R78 RES MF 1.5K 1% 1/4W R79 RES MF 953 OHM 1% 1/4W R80 RES MF 22.1K 1% 1/4W R81 RES MF 221K 1% 1/4W R82 RES MF 1.82K 1% 1/4W R83 RES MF 75K 1% 1/4W R84 RES MF 1M 1% 1/4W R85 RES NETWORK 2 X 220K ISO R86 RES MF 221K 1% 1/4W R87 RES MF 200K 1% 1/4W R88 RES MF 1K 1% 1/4W

24 PARTS LIST con t MAIN PCB (cont d) Ref No. Description Part No. Ref No. Description Part No. R89 RES NETWORK 2 X 220K ISO R90 RES MF 1M 1% 1/4W R91 RES MF 47.5K 1% 1/4W R92 RES MF 1.5K 1% 1/4W R93 RES MF 953 OHM 1% 1/4W R94 RES MF 22.1K 1% 1/4W R95 RES MF 221K 1% 1/4W R96 RES MF 1.82K 1% 1/4W R97 RES MF 75K 1% 1/4W R98 RES MF 1M 1% 1/4W R99 RES MF 1K 1% 1/4W R100 RES NETWORK 2 X 220K ISO R101 RES MF 40.2K 1% 1/4W R102 RES MF 221 OHM 1% 1/4W R103 RES NETWORK 2 X 220K ISO R104 RES MF 40.2K 1% 1/4W R105 RES MF 20K 1% 1/4W R106 RES MF 20K 1% 1/4W R107 RES NETWORK 2 X 220K ISO R108 RES MF 1K 1% 1/4W R109 RES MF 40.2K 1% 1/4W R110 RES MF 221 OHM 1% 1/4W R111 RES MF 40.2K 1% 1/4W R112 RES NETWORK 2 X 220K ISO R113 RES MF 20K 1% 1/4W R114 RES MF 20K 1% 1/4W R115 RES NETWORK 2 X 220K ISO R116 RES MF 10K 1% 1/4W R117 RES MF 10 OHM 1% 1/4W R118 RES MF 10K 1% 1/4W R119 RES MF 365 OHM 1% 1/4W R120 RES MF 3.32K 1% 1/4W R121 RES MF 22.1 OHM 1% 1/4W R122 RES MF 200K 1% 1/4W R123 RES MF 3.32K 1% 1/4W R124 RES MF 332 OHM 1% 1/4W R125 RES MF 8.25K 1% 1/4W R126 RES MF 100K 1% 1/4W R127 RES MF 221 OHM 1% 1/4W R128 RES MF 1M 1% 1/4W R129 RES MF 200K 1% 1/4W R130 RES MF 100K 1% 1/4W R131 RES MF 475 OHM 1% 1/4W R132 RES MF 1K 1% 1/4W R133 RES MF 1K 1% 1/4W R134 RES MF 100K 1% 1/4W R135 RES MF 267K 1% 1/4W R136 RES MF 3.32K 1% 1/4W R137 RES MF 1K 1% 1/4W R138 RES MF 10K 1% 1/4W R139 RES MF 10K 1% 1/4W R140 RES MF 33.2K 1% 1/4W R141 RES MF 200K 1% 1/4W R142 RES MF 221 OHM 1% 1/4W R143 RES MF 100K 1% 1/4W R144 RES MF 33.2K 1% 1/4W R145 RES MF 221 OHM 1% 1/4W R146 RES MF 100K 1% 1/4W R147 RES MF 1M 1% 1/4W R148 RES MF 221 OHM 1% 1/4W R149 RES MF 20K 1% 1/4W R150 RES MF 100K 1% 1/4W R151 RES MF 22.1K 1% 1/4W R152 RES MF 1K 1% 1/4W R153 RES MF 221 OHM 1% 1/4W R154 RES MF 100K 1% 1/4W R155 RES MF 10K 1% 1/4W R156 RES MF 221 OHM 1% 1/4W R157 RES MF 10K 1% 1/4W R158 RES MF 22.1K 1% 1/4W R159 RES MF 100K 1% 1/4W R160 RES MF 33.2K 1% 1/4W R161 RES MF 22.1K 1% 1/4W R162 RES MF 221 OHM 1% 1/4W R163 RES MF 100K 1% 1/4W R164 RES MF 100 OHM 1% 1/4W R165 RES MF 100K 1% 1/4W R166 RES MF 100 OHM 1% 1/4W R167 RES MF 100K 1% 1/4W R168 RES MF 22.1K 1% 1/4W R169 RES MF 1K 1% 1/4W R170 RES MF 10K 1% 1/4W R171 RES MF 1K 1% 1/4W R172 RES MF 1K 1% 1/4W R173 RES MF 1K 1% 1/4W R174 RES MF 10M 1% 1/4W R175 RES MF 10M 1% 1/4W R176 RES MF 332 OHM 1% 1/4W R177 RES MF 1.82K 1% 1/4W R178 RES MF 1.82K 1% 1/4W R179 RES MF 1.82K 1% 1/4W R180 RES MF 1.82K 1% 1/4W R181 RES MF 3.32K 1% 1/4W R182 RES MF 3.32K 1% 1/4W R183 RES MF 365 OHM 1% 1/4W R188 RES MF 221K 1% 1/4W R189 RES MF 221K 1% 1/4W R192 RES MF 33.2K 1% 1/4W R193 RES MF 33.2K 1% 1/4W R196 RES MF 100K 1% 1/4W R197 RES MF 100K 1% 1/4W R200 RES MF 267K 1% 1/4W R201 RES MF 365 OHM 1% 1/4W R220 RES MF 47.5K 1% 1/4W T1 TRANSFORMER R-CORE POWER U1 IC REGULATOR 5V U2 IC -5V REGULATOR U3 IC DUAL OPERATIONAL AMPLIFIER

25 C220 PARTS LIST con t 3 MAIN PCB (cont d) Ref No. Description Part No. Ref No. Description Part No. U4 IC SHFT REG SER-PAR U5 IC STEREO DGTL VOLUME CONTROL U6 IC SHFT REG SER-PAR U7 IC OCTAL DARLNGTON TRANS ARRAY U8 IC SHFT REG SER-PAR U9 IC OCTAL DARLNGTON TRANS ARRAY U10 IC DUAL OPERATIONAL AMPLIFIER U11 IC VOLTAGE REGLTR VARIABLE NEG (U11) HEATSINK TO U12 IC VOLTAGE REGLTR VARIABLE POS (U12) HEATSINK TO U13 IC SHFT REG SER-PAR U14 IC VOLTAGE REGLTR VARIABLE NEG (U14) HEATSINK TO U15 IC VOLTAGE REGLTR VARIABLE POS (U15) HEATSINK TO U16 IC REGULATOR +5V (U16) HEATSINK TO U17 IC 2 INPUT X U18 IC DUAL OPERATIONAL AMPLIFIER U19 IC DUAL OPERATIONAL AMPLIFIER U21 IC DUAL OPERATIONAL AMPLIFIER V1 SOCKET 9 PIN TUBE CERAMIC V3 SOCKET 9 PIN TUBE CERAMIC V5 SOCKET 9 PIN TUBE CERAMIC V7 SOCKET 9 PIN TUBE CERAMIC ASSEMBLY INSERTION PCB MAIN ASSY INSERTION PCB MAIN DISPLAY PCB C1 CAP ELECT 10UF 50V C2 CAP MONO.1UF 50V 20% Z5U C3 CAP ELECT 47UF 35V C4 CAP MONO.1UF 50V 20% Z5U C5 CAP ELECT 10UF 50V C6 CAP ELECT 47UF 16V C7 CAP MONO.1UF 50V 20% Z5U C8 CAP MONO.1UF 50V 20% Z5U C9 CAP ELECT 10UF 50V C10 CAP MONO 220PF 200V 10% NPO C11 CAP MONO.1UF 50V 20% Z5U C12 CAP MONO 220PF 200V 10% NPO C13 CAP MONO 220PF 200V 10% NPO C14 CAP MPF 0.033UF 5% 63VDC C15 CAP MPF 0.033UF 5% 63VDC C16 CAP MPF 0.033UF 5% 63VDC C17 CAP MONO.1UF 50V 20% Z5U C18 CAP MPF 0.033UF 5% 63VDC C19 CAP ELECT 22UF 100V C20 CAP MONO.1UF 50V 20% Z5U C21 CAP ELECT 22UF 100V D1 DIODE SILICON D2 DIODE ZENER 6.2V 5% 500MW D3 DIODE SILICON D4 DIODE SILICON D5 DIODE SILICON DS1 LED GRN 5MM HI-INTENSITY (DS1) SPACER LED DS2 LED GRN 5MM HI-INTENSITY (DS2) SPACER LED DS3 LED GRN 5MM HI-INTENSITY (DS3) SPACER LED DS4 LED GRN 5MM HI-INTENSITY (DS4) SPACER LED DS5 LED GRN 5MM HI-INTENSITY (DS5) SPACER LED DS6 LED GRN 5MM HI-INTENSITY (DS6) SPACER LED DS7 DISPLAY 12 CHARACTER DS8 LED GRN 5MM HI-INTENSITY (DS8) SPACER LED J1 CONN FFC 18PIN J2 CONN FFC 18PIN J5 CONN FFC 18PIN K1 RELAY REED SPST-NO 5V 1.2A K2 RELAY REED SPST-NO 5V 1.2A K3 RELAY REED SPST-NO 5V 1.2A K4 RELAY REED SPST-NO 5V 1.2A MTGPA1 DBL COATED MTG-TAPE 1/16 THK MTGPA2 DBL COATED MTG-TAPE 1/16 THK MTGPA3 DBL COATED MTG-TAPE 1/16 THK MT1 SENSOR IR 38KHZ Q1 TRANSISTOR PNP Q3 TRANSISTOR NPN 2K/REEL R1 RES MF 475K 1% 1/4W R2 RES MF 10K 1% 1/4W R3 RES MF 100 OHM 1% 1/4W R4 RES MF 475 OHM 1% 1/4W R5 RES MF 10 OHM 1% 1/4W R6 RES MF 47.5K 1% 1/4W R7 RES MF 475 OHM 1% 1/4W R8 RES NET 10K X8 RES BUSSED R9 RES NETWORK 9X R10 RES MF 324 OHM 1% 1/4W R12 RES MF 100 OHM 1% 1/4W R13 RES MF 47.5K 1% 1/4W R14 RES NETWORK 9X R15 RES MF 1K 1% 1/4W R16 RES MF 324 OHM 1% 1/4W R17 RES MF 324 OHM 1% 1/4W R18 RES MF 324 OHM 1% 1/4W R19 RES MF 324 OHM 1% 1/4W R20 RES MF 324 OHM 1% 1/4W R22 RES MF 324 OHM 1% 1/4W R21 RES MF 100K 1% 1/4W R23 RES MF 100 OHM 1% 1/4W R24 RES MF 100 OHM 1% 1/4W R25 RES MF 100 OHM 1% 1/4W R26 RES MF 221 OHM 1% 1/4W R27 RES MF 100 OHM 1% 1/4W

26 PARTS LIST con t DISPLAY PCB (cont d) Ref No. Description Part No. Ref No. Description Part No. R28 RES MF 2.21K 1% 1/4W R29 RES MF 1K 1% 1/4W R30 RES MF 1K 1% 1/4W R32 RES NETWORK 9X R33 RES MF 100 OHM 1% 1/4W R34 RES MF 100 OHM 1% 1/4W R35 PC BD TONE (R35) POT EQUAL (R35A) CONN 4 PIN RIGHT ANGLE (R35B) CONN 4 PIN RIGHT ANGLE (R35C) CONN 4 PIN RIGHT ANGLE (R35D) CONN 4 PIN RIGHT ANGLE R39 RES MF 1M 1% 1/4W R43 RES MF 100K 1% 1/4W R44 RES MF 681 OHM 1% 1/4W R46 RES MF 681 OHM 1% 1/4W R45 RES MF 100K 1% 1/4W R47 RES MF 475 OHM 1% 1/4W R48 RES MF 475 OHM 1% 1/4W R40 RES MF 1M 1% 1/4W R41 RES MF 1M 1% 1/4W R42 RES MF 1M 1% 1/4W S1 ENCODER OPTICAL ROTARY S2 SWITCH ROT PULSE S2 PC BD SWITCH (S2) CONN 3-PIN RIGHT ANGLE U1 IC NOR 2 INPUT X U2 IC MICRO RESET POS U3 IC CMOS EPROM U4 IC PROGRAMMED V1.00 C U3 SOCKET IC 8-POS U4 SOCKET IC 40-PIN U6 IC SHFT REG SER-PAR U8 IC DUAL OPERATIONAL AMPLIFIER Y1 CERAMIC RESONATOR 12MHZ Y2 RES MF 8.25K 1% 1/4W Y2 RESONATOR CERAMIC 2.00MHZ ASSEMBLY INSERTION PCB DISPLAY ASSY INSERTION PCB DISPLAY ASSY DISPLAY PCB SM PART BALANCED/DATA PCB C1 CAP ELECT 10UF 50V C2 CAP ELECT 10UF 50V C3 CAP ELECT 10UF 50V C4 CAP ELECT 10UF 50V C5 CAP ELECT 10UF 50V C6 CAP ELECT 10UF 50V C7 CAP ELECT 10UF 50V C8 CAP ELECT 10UF 50V C9 CAP ELECT 10UF 50V C10 CAP ELECT 10UF 50V C11 CAP ELECT 10UF 50V C12 CAP ELECT 10UF 50V C13 CAP ELECT 10UF 50V C14 CAP ELECT 10UF 50V C15 CAP ELECT 10UF 50V C16 CAP ELECT 10UF 50V C17 CAP MONO.1UF 50V 20% Z5U C18 CAP MONO.1UF 50V 20% Z5U C19 CAP MONO 1000PF 50V 10% NPO C20 CAP MONO.1UF 50V 20% Z5U D1 DIODE SILICON D2 DIODE SILICON D3 DIODE SILICON J1 CONN XLR FEM HORIZ PCB LATCH J2 CONN XLR FEM HORIZ PCB LATCH J3 CONN XLR FEM HORIZ PCB LATCH J4 CONN XLR FEM HORIZ PCB LATCH J5 RECEPTACLE XLR MALE J6 RECEPTACLE XLR MALE J7 CONN FFC 18PIN J8 CONN FFC 18PIN J9 JACK HEADPHONE DUAL BLACK 1/ J10 JACK HEADPHONE DUAL BLACK 1/ J11 CONN GOLD F RIGHT ANGLE J12 JACK HEADPHONE DUAL BLACK 1/ J13 JACK HEADPHONE DUAL BLACK 1/ J14 JACK HEADPHONE DUAL BLACK 1/ J15 JACK HEADPHONE DUAL BLACK 1/ J16 CONN FFC 18PIN K1 RELAY REED SPST-NO 5V 1.2A K2 RELAY REED SPST-NO 5V 1.2A K3 RELAY REED SPST-NO 5V 1.2A K4 RELAY REED SPST-NO 5V 1.2A K5 RELAY REED SPST-NO 5V 1.2A K6 RELAY REED SPST-NO 5V 1.2A K7 RELAY REED SPST-NO 5V 1.2A K8 RELAY REED SPST-NO 5V 1.2A K9 RELAY REED SPST-NO 5V 1.2A K10 RELAY REED SPST-NO 5V 1.2A PCB1 PC BD BAL/DATA R1 RES MF 221 OHM 1% 1/4W R2 RES MF 221 OHM 1% 1/4W R3 RES MF 221 OHM 1% 1/4W R4 RES MF 221 OHM 1% 1/4W R5 RES MF 100K 1% 1/4W R6 RES MF 100K 1% 1/4W R7 RES MF 267K 1% 1/4W R8 RES MF 267K 1% 1/4W R9 RES MF 267K 1% 1/4W R10 RES MF 267K 1% 1/4W R11 RES MF 267K 1% 1/4W R12 RES MF 267K 1% 1/4W R13 RES MF 267K 1% 1/4W R14 RES MF 267K 1% 1/4W R15 RES MF 267K 1% 1/4W R16 RES MF 267K 1% 1/4W R17 RES MF 267K 1% 1/4W

27 C220 PARTS LIST con t BALANCED/DATA PCB (cont d) Ref No. Description Part No. R18 RES MF 267K 1% 1/4W R19 RES MF 10 OHM 1% 1/4W R20 RES MF 182 OHM 1% 1/4W R21 RES MF 182 OHM 1% 1/4W R22 RES MF 182 OHM 1% 1/4W R23 RES MF 182 OHM 1% 1/4W R24 RES MF 182 OHM 1% 1/4W R25 RES MF 182 OHM 1% 1/4W R26 RES MF 182 OHM 1% 1/4W R27 RES MF 182 OHM 1% 1/4W R28 RES MF 10 OHM 1% 1/4W R29 RES MF 100 OHM 1% 1/4W R30 RES MF 100 OHM 1% 1/4W R31 RES MF 100 OHM 1% 1/4W R32 RES MF 100 OHM 1% 1/4W R33 RES MF 100 OHM 1% 1/4W R34 RES MF 100 OHM 1% 1/4W R35 RES MF 100 OHM 1% 1/4W R36 RES MF 100 OHM 1% 1/4W R37 RES MF 1K 1% 1/4W R38 RES MF 221 OHM 1% 1/4W R39 RES MF 1K 1% 1/4W R40 RES MF 1K 1% 1/4W R41 RES MF 1K 1% 1/4W R42 RES MF 40.2K 1% 1/4W R43 RES MF 22.1K 1% 1/4W U1 IC AND 2 INPUT X U2 IC AND 2 INPUT X U3 IC 8 LN DRIVER ARRAY U4 IC SHFT REG SER-PAR U5 IC OPERATIONAL AMPLIFIER ASSY INSERTION PCB BAL/DATA TONE PCB ????? Ref No. Description Part No. 1 PCB Part Number LOGO J1 CONN 4-PIN RIGHT ANGLE J2 CONN 4-PIN RIGHT ANGLE R1 Potentiometer PUSHBUTTON PCB Pushbutton PCB LOGO DS1 LED SQUARE RED DS2 LED SQUARE RED DS3 LED SQUARE RED DS4 LED SQUARE RED DS5 LED SQUARE RED DS6 LED SQUARE RED DS7 LED SQUARE RED J1 CONN FFC 18PIN S1 SWITCH PB TACT S2 SWITCH PB TACT S3 SWITCH PB TACT S4 SWITCH PB TACT S5 SWITCH PB TACT S6 SWITCH PB TACT S7 SWITCH PB TACT S8 SWITCH PB TACT ? HEADPHONE PCB PCB Part Number LOGO J1 HEADPHONE JACK J2 CONN 12 PIN FFC

28 NOTES 44

29 REPACKING INSTRUCTIONS C220 45

30 C220 TUBE PREAMPLIFIER SERIAL NO. WS1001 And Above The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of the constant upgrading of McIntosh products circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only. McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK Printed in U.S.A. Part Number

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