The EIMAC 4CX20,000D/9015 is a ceramic/metal VHF power tetrode intended for use as a RF amplifier up to 110 MHz. It is particularly recommended for use in the 88-108 MHz FM band. It features an electromechanical structure which provides high RF operating efficiency and low RF losses. The 4CX20,000D has a gain of up to 20 dB in FM broadcast service. The anode is rated for 20 kilowatts of dissipation with forced-air cooling 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 C 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) RF power amplifier 12,500 5.0 T ypical Operation Plate Screen Voltage Voltage (Volts) (Volts) 11,600 20,000 Watts 300 Watts 200 Watts 110 MHz 9.5 Thoriated Tungsten 7.5 Volts 145 Amps Grounded Cathode 181 pf 18.7 pf 0.5 pf Grounded Grid 76 pf 19.2 pf .05 pf Forced Air Special, Coaxial SK-360 SK-336 --9.51 in; 24.17 cm 7.85 in; 19.95 cm 14.8 lb; 6.7 kg 1,300 Plate Current (Amps) 3.7 Drive Output Power Power (Watts) (kiloWatts) 500 35.5 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 | 4CX20,000D/ 9015 CPI | 4CW50,000J 4CX20,000D/9015