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ID = 63039
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Detector 
  <1925 very rare. ***
Identical to VT28_GPO = DE3 = B5

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Telephony
Filament Vf 2.8 Volts / If 0.06 Ampere / Direct

Small triode used by the British Post Office in radio applications as a detector and amplifier. First made in 1923 by MOV and 1050 tubes manufactured.

Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 84 and 134

b4~~14.png VT28_GPO: Fin Stewart
Fin Stewart

Just Qvigstad

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