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4001AB

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ID = 50124
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to 4001AB = 4215AB

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 1 Volts / If 0.25 Ampere / Direct / Battery =
Information source - - Manufacturers Literature   not dated

b4_base_pins~~565.png 4001AB: Fin Stewart
Fin Stewart


Just Qvigstad
40011_1.png
4001AB: own collection
Peter den Boer

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