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ID = 20373
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to 8A1_7pin
Similar Tubes
Other base:
  8A1 ; E446 ; SP4

Base British-7-Pin, old (M7A) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source History of the British Radio Valve to 1940   p. 144 & 195
Babani, International Radio Tube Encyclopaedia   p. 16 & 17
Universal Vade-Mecum, Electron Valves and Semiconductor Devices

158_10~~5.png 8A1_7pin: Fin Stewart
Fin Stewart

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Just Qvigstad
8A1_7pin: Brimar Valve Manual 1947-8
Adrian Riesen

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