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ID = 48389
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Transmitting Tube, Pentode, air cooled 
  Ca. 1925 up to 1945 very rare. ***
Identical to VT144_GPO = ATP75 = CV1371 = PT6
Similar Tubes
Normally replaceable-slightly different:
  NT38 ; PZ1-75 ; SW75Pen

Base SPECIAL TUBEBASE in general Top contact with a cap.
Was used by Telephony
Filament Vf 10 Volts / If 2 Ampere / Direct / Specified voltage AND current AC/DC

4-pin base similar to Americn 50 watt transmitting base. 75W plate dissipation.

Information source -- Original-techn. papers.   
VT144_GPO: Manufacturer's Literature
Emilio Ciardiello

VT144_GPO: Manufacturer's Literature
Emilio Ciardiello

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