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4056A

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ID = 85665
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 4056A
Similar Tubes
Normally replaceable-slightly different:
  AT35 ; CV1025 ; CV1567 ; DET25 ; VT25 ; VT62_GPO
Other base:
  4056B

Base L4 British large 4 pin (1922, LG4)
Was used by Transmittertube (Radio)
Filament Vf 6 Volts / If 1 Ampere / Direct
Information source British Radio Valves - The Classic Years: 1926-1946   p. 212
Babani, International Radio Tube Encyclopaedia   p. 184 & 185


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