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ID = 11963
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Transmitting Tube, Pentode, air cooled   Text 
  Ca. 1925 up to 1945 rare.
Identical to CV1371 = ATP75 = PT6 = VT144_GPO
Similar Tubes
Normally replaceable-slightly different:
  NT38 ; PZ1-75 ; SW75Pen

Base SPECIAL TUBEBASE in general (Codex=Bz) Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 2 Ampere / Direct / Specified voltage AND current AC/DC

4-pin base similar to US 50 watt transmiting tube base. 75W plate dissipation.

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
CV1371: Manufacturer's Literature
Emilio Ciardiello

CV1371: Manufacturer's Literature
Emilio Ciardiello

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