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ID = 63212
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   RF/IF-Stage 
  <1925 very rare. ***
Identical to VT29_GPO
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general Other combinations of connections.
Was used by Telephony
Filament Vf 5 Volts / If 0.75 Ampere / Direct / Battery =

Low capacitance tube designed for the British Post Office for radio applications

Dimensions (WHD)
incl. pins / tip
18 x 73 x mm / 0.71 x 2.87 x inch
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 84 and 134


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