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ID = 11957
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Transmitting Tube, Pentode, air cooled   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to NT38 = PZ1-75 = ATP75 = CV1293
Similar Tubes
Normally replaceable-slightly different:
  CV1221 ; CV1371 ; PT6 ; SW75Pen ; VT144_GPO

Base SPECIAL TUBEBASE in general (Codex=Bz)
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 2 Ampere / Direct / Specified voltage AC/DC

4 pin base similar to 50 watt US transmitimg tube base. 75 watts dissipation

Information source Taschenbuch zum Röhren-Codex 1948/49   
NT38: Manufacturer's Literature
Emilio Ciardiello


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