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B21_BTH

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ID = 28419
       
Country:
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  TRIODE (Detail uncertain)   Universal 
Identical to B21_BTH
First year 1927 Saga of the Vacuum Tube, Tyne Seite 390

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Information source History of the British Radio Valve to 1940   Page 163
 
b4_base_pins~~113.png
B21_BTH: Fin Stewart
Fin Stewart

 

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