The 3CX20,000A7 is a high-mu power triode intended for use as a zero bias Class B RF amplifier or Class C power amplifier or oscillator. Class B operation with zero grid bias offers circuit simplicity. In addition, grounded grid operation is attractive since a power gain as high as twenty times can be obtained. Class of Operation Characteristics Plate Dissipation (Max.) Screen Dissipation (Max.) Grid Dissipation (Max.) Frequency for Max. rating (CW) Amplification Factor Filament/Cathode Voltage Current Capacitance Input Output Feedthrough Capacitance Input Output Feedthrough Cooling Base Air Socket Air Chimney Boiler Length Diameter Weight Maximum Ratings Type of Service Plate Voltage (Volts) Plate Current (Amps) 20,000 Watts --500 Watts 110 MHz 200 Thoriated Tungsten 6.3 Volts 160 Amps Grounded Cathode 61.0 pf 0.2 pf 360 pf Grounded Grid 61.0 pf 36.0 pf 0.2 pf Forced Air Coaxial SK-1300 ----8.75 in; 222.20 mm 8.31 in; 211.10 mm 13.5 oz; 6.15 kg T ypical Operation Plate Screen Voltage Voltage (Volts) (Volts) Plate Current (Amps) Drive Output Power Power (Watts) (kiloWatts) C Grid driven RF amplifier at 110 MHz 10,000 5.0 7,000 --- 4.0 430 21,300 C Cathode driven RF amplifier at 110 MHz 10,000 5.0 7,800 --- 4.2 2,300 27,500 B Cathode driven RF amplifier TV service at 216 MHz 10,000 6.0 7,200 --- 5.8 1,700 27,500 AB Cathode driven linear amplifier at 110 MHz 10,000 6.0 7,000 --- 5.0 1,540 24,200 The values listed above represent specified limits for the product and are subject to change. The data should be used for basic information only. Formal, controlled specifications may be obtained from CPI for use in equipment design. For information on this and other CPI products, visit our website at: www.cpii.com, or contact: CPI MPP Division, Eimac Operations, 607 Hansen Way, Palo Alto, CA 94303 telephone : 1(800) 414-8823. fax : (650) 592-9988 | email : [email protected] CPI | 3cX20,000A7 CPI | 4CW50,000J 3CX20,000A7