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ID = 33215
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to CV1651 = G445B = VT68_GPO

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Telephony
Filament Vf 4 Volts / If 0.45 Ampere / Direct / Specified voltage AC/DC

Tube decended from the MOV G445B - a specially designed variation of the LS5, similar in all dimensions, but with a double carbonated coated nickel ribbon filament. VT68_GPO was a later development and trhe CV1651 first made in WW2. Used as a line amplifier in telephony.

Information source The Saga of Marconi Osram Valve   Pages 136 & 137
Babani, International Radio Tube Encyclopaedia   Pages 76-77

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