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
