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The 4CX20000D is a metal-ceramic sealed, forced air cooled tetrode with a direct-heating thoriated tungsten cathode. The operating frequency is 110MHz, the anode dissipation power is 20kW, and the output power is 35kW. It is suitable for radio frequency power amplification and features both high power and low distortion. The tube has 20dB gain in FM radio.

Specifications:

Filament Voltage……7.5V

Filament Current……145A

Amplification Factor……9.5

Interelectrode Capacitances (Grounded cathode)

         Input……181pF        Feedback……0.5pF  Output……18.7Pf

Mounting……Upright

Cooling……forced air

Weight……7kg

Height...241mm

Diameter...200mm

Temperature at anode shell and seals……250℃

Maximum ratings:

DC Anode voltage...12.5kV

DC Anode current...5A

Anode dissipation power...20kW

Grid No. 2 dissipation...0.3kW

Grid No. 1 dissipation...0.2kW

Typical conditions

DC Anode Voltage……1160V

DC Anode Current……3.7A

DC Grid 2 Voltage……1360V

DC Grid 2 Current……0.138A

DC Grid 1 Current……0.125A

Anode Output Power……35kW