The 4CX20,000B is intended for use as a Class C RF power amplifier in AM broadcast service, for use as a push-pull audio amplifier or modulator, or as a pulse modulator. The anode is rated for 20 kW dissipation and incorporates a highly efficient cooler of new design, which significantly reduces air pressure and flow requirements and produces low acoustical noise. 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 450 Watts 200 Watts 30 MHz 6.7 Thoriated Tungsten 10.0 Volts 140 Amps Grounded Cathode 190 pf 23.5 pf 1.5 pf Grounded Grid 8. pf 24.5 pf 0.2 pf Forced Air Special, Coaxial SK-320 SK-326 --9.84 in; 249.90 mm 8.86 in; 225.04 mm 20.0 lb; 9.06 kg T ypical Operation Plate Screen Voltage Voltage (Volts) (Volts) Plate Current (Amps) Drive Output Power Power (Watts) (kiloWatts) C RF power amplifier 12,000 5.0 9,000 900 4.01 26 28.2 C RF power amplifier plate modulated 10,000 5.0 7,800 750 4.60 35 29.0 AB1 AF amplifier or modulator (2 tubes) 12,500 6.0 7,800 1,500 9.2 --- 44.0 --- Pulse modulator or regulator 35,000 60 --- --- --- --- --- 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 Operation, 607 Hansen Way, Palo Alto, CA 94303 telephone : 1(800) 414-8823. fax : (650) 592-9988 | email : [email protected] CPI | 4CX20,000B CPI | 4CW50,000J 4CX20,000B