The 4CX12,000A/8989 is intended for use in VHF radio frequency applications. It features an internal mechanical structure which results in high RF operating efficiency. Low RF losses in this structure permit operation at full ratings up to 220 MHz. The 4CX12,000A/8989 has a gain of 18 dB in FM broadcast service, and is also recommended for RF linear amplifier service, and for VHF-TV linear amplifier service. The anode is rated for 12 kilowatts of dissipation with forced air-cooling and incorporates a new highly efficient cooler 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 Boiler Length Diameter Weight Maximum Ratings Type of Service Plate Voltage (Volts) Plate Current (Amps) 12,000 Watts 300 Watts 150 Watts 220 MHz 6.7 Thoriated Tungsten 6.5 Volts 120 Amps Grounded Cathode 160.0 pf 18.5 pf 1.0 pf Grounded Grid 70 pf 18.6 pf 0.1 pf Forced Air Special, Coaxial SK-300A --9.84 in; 24.99 cm 7.76 in; 19.71 cm 19.2 lb; 8.75 kg T ypical Operation Plate Screen Voltage Voltage (Volts) (Volts) Plate Current (Amps) Drive Output Power Power (Watts) (kiloWatts) C RF amplifier, grid-driven 10,000 3.5 9,000 750 2.83 23 20.0 C RF amplifier at 90.5 MHz 10,000 3.5 9,950 650 3.08 245 22.9 C RF amplifier at 108.1 MHz 10,000 3.5 10,000 800 2.81 275 22.5 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 | 4CX12,000A/ 8989 CPI | 4CW50,000J 4CX12,000A/8989