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4ZC/300J

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ID = 55559
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Transmitter Tetrode, liquid-cooling   Power/Output 
Identical to 4ZC/300J

Was used by Transmittertube (Radio)
Filament Vf 8 Volts / If 300 Ampere / Direct / Specified voltage AC/DC
Description Water-vapour Cooled 40kW anode dissipation tetrode.

Full frequency operation to 30 MHz, usable to 50MHz.
Typically, modulated class C: Va=10kV, Va =6.7A. Pout 50kW.
Typically, unmodulated class C: Va=13kV, Va =10.1A. Pout 100kW. 

Information source - - Manufacturers Literature   May 1967
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