The 4CX20,000E is a ceramic/metal power tetrode intended for use as a VHF power amplifier. It features a type of internal mechanical structure, which results in rf operating efficiency. Low rf losses in this structure permit operation at full ratings to 110 MHz. The 4CX20,000E provides high gain in FM Broadcast service and is also recommended for rf linear power amplifier service, including IBOC digital transmission. The anode is rated for 20 kilowatts of dissipation with forced-air cooling and incorporates a compact, highly efficient cooler of new design 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 - VHF Air Socket - dc to HF Length Diameter Weight Maximum Ratings Type of Service Plate Voltage (Volts) Plate Current (Amps) 20,000 Watts 450 Watts 200 Watts 110 MHz 6.7 Thoriated Tungsten 10.0 Volts 140 Amps Grounded Cathode 195 pf 22.7 pf 0.6 pf Grounded Grid 87.4 pf 23.1 pf .08 pf Forced Air Special, Coaxial SK-360, Y-291 SK-320 9.84 in; 249.90 mm 7.85 in; 199.95 mm 15.0 lb; 6.8 kg T ypical Operation Plate Screen Voltage Voltage (Volts) (Volts) Plate Current (Amps) Drive Output Power Power (Watts) (kiloWatts) C RF power amplifier 12,500 5.0 9,000 800 4.15 360 28.9 C RF power amplifier 12,500 5.0 11,500 650 3.75 405 33.2 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 | 4CX20,000E CPI | 4CW50,000J 4CX20,000E