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ID = 30754
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Triode, vacuum   Power/Output 
Identical to CV1637 = VT25_GPO
Similar Tubes
Normally replaceable-slightly different:
Other base:
  LS5 ; VT24_GPO

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament Vf 4.5 Volts / If 0.82 Ampere / Direct / Specified voltage AC/DC
Description This is the LS5 fitted with the Post Office UX4 pin base. 
Information source -- Original-techn. papers.   

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