MECHANICAL ELECTRICAL GENERAL CHARACTERISTICS
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1 The 833A/C is a triode especially designed for RF power amplifier applications, as well as audio frequency power amplifier and modulator service. Maximum ratings apply up to 30 MHz, and reduced ratings up to 75 MHz. GENERAL CHARACTERISTICS MECHANICAL Mounting Position Vertical, base up or down Cooling Radiation or forced air Radiation cooling means that there is sufficient free circulation of air around the tube to keep the seal temperatures within limits. Forced-air cooling means that an air flow of 40 CFM from a 2" diameter nozzle directed vertically on bulb between grid and plate seals is required to limit the temperature between these seals to 145 C. ELECTRICAL Filament Thoriated Tungsten Voltage 10.0 volts + 5% Current 10 amps Amplification factor Ec = -10 V 35 1 b = 200 ma Direct Interelectrode Capacitances Grid to plate 6.3 pf Grid to filament 12.3 pf Plate to filament 8.5 pf AF POWER AMPLIFIER AND MODULATOR-CLASS B MAXIMUM RATINGS, ABSOLUTE VALUES DC Plate Voltage V Max-Signal DC plate current ma Max-Signal Plate input watts Plate Dissipation watts
2 (2 Tubes) DC Grid Voltage volts Peak AF Grid-to-Grid Voltage volts Zero-Signal DC Plate Current ma Max. Signal DC Plate Current ma Effective Load Resistance (plate to plate) ohms Max.-Signal Driving Power (approx.) watts Max.-Signal Power Output (approx.) watts RF POWER AMPLIFIER - CLASS B TELEPHONY Carrier conditions per tube for use with a max. modulation factor of 1.0 MAXIMUM RATINGS, ABSOLUTE VALUES DC Plate Current ma Plate Input watts Plate Dissipation watts DC Grid Voltage volts Peak RF Grid Voltage volts DC Plate Current ma DC Grid Current (approx.) ma Driving Power (approx.) atts Power Output (approx.) watts PLATE-MODULATED RF POWER AMPLIFIER - CLASS C TELEPHONY Carrier conditions per tube for use with a max. modulation factor of 1.0 MAXIMUM RATINGS, ABSOLUTE VALUES DC Plate Voltage volts DC Grid Voltage volts DC Plate Current ma DC Grid Current ma Plate Input watts Plate Dissipation watts DC Plate Voltage volts DC Grid Voltage volts From a grid resistor of ohms Peak RF Grid Voltage volts DC Plate Current ma DC Grid Current (approx.) ma Driving Power (approx.) watts Power Output (approx.) watts
3 RF POWER AMPLIFIER & OSCILLATOR - CLASS C TELEGRAPHY 6 and RF POWER AMPLIFIER - CLASS C FM TELEPHONY Radiation Cooling Forced-air Cooling MAXIMUM RATINGS, ABSOLUTE VALUES DC Grid Voltage volts DC Plate Current ma DC Grid Current ma Plate Input watts Plate Dissipation watts DC Plate Voltage volts DC Grid Voltage volts From a grid resistor of ohms From a cathode resistor of ohms Peak RF Grid Voltage volts DC Plate Current ma DC Grid Current (approx.) ma Driving Power (approx.) watts Power Ouptput (approx.) watts AMPLIFIER or OSCILLATOR -CLASS C With Separate, Rectified, Unfiltered, Single-Phase, Full-Wave Plate Supply MAXIMUM RATINGS, ABSOLUTE VALUES CCS ICAS CCS DC Plate Voltage volts DC Grid Voltage volts DC Plate Current ma DC Grid Current ma Plate Input watts Plate Dissipation watts
4 AMPLIFIER or OSCILLATOR - CLASS C continued Radiation Cooling Forced-air Cooling CCS ICAS CCS DC Plate Voltage volts DC Grid Voltage volts From a grid resistor of ohms DC Plate Current ma DC Grid Current (approx.) ma Driving Power (approx.) watts Output-Circuit Efficiency (approx.) % Useful Power Output (approx.) watts RATINGS vs. FREQUENCY WITH RADIATION COOLING FREQUENCY Mc MAXIMUM PERMISSIBLE PERCENTAGE of MAXIMUM RATED PLATE VOLTAGE and PLATE INPUT: Class B Telephony % Class C Telephony % Class C Telegraphy % RATINGS vs. FREQUENCY WITH FORCED-AIR COOLING FREQUENCY Mc MAXIMUM PERMISSIBLE PERCENTAGE of MAXIMUM RATED PLATE VOLTAGE and PLATE INPUT: Class B Telephony % Class C Telephony % Class C Telegraphy % FOOTNOTES 1 Averaged over any audio-frequency cycle of sine-wave form. 2 For AC filament supply. 3 At crest of audio-frequency cycle with modulation factor of Obtained by grid resistor, or from a combination of grid resistor with either fixed supply or cathode resistor. 5 Subject to wide variation depending on the impedance of the load circuit. High-impedance load circuits require more grid current and drivingpower to obtain the desired output. Low-impedance load circuits need less grid current and driving power, but plate-circuit efficiency is sacri-ficed. The driver stage should have good regulation and should be capable of delivering considerably more than the required driving power. 6 Key-down conditions per tube without amplitude modulation. Amplitude modulation essentially negative may be used if the positive peak ofthe audio-frequency envelope does not exceed 115% of the carrier conditions. 7 Obtained from fixed sulpply by grid resistor, by cathode resistor, or by combination methods. 8 Obtained from a grid resistor of the value shown or from a combination of grid resistor and cathode resistor. Fixed bias operation is notrecommended The bias resistor should not be bypassed for the plate and grid voltage supply frequency. 9 From a driver with a rectified, unfiltered, single-phase, full wave plate supply. 10 Power input to plate is 1.23 times the product of dc plate voltage times dc plate current. 11 This value of useful power is measured at load of output circuit having the indicated efficiency.
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