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P4_Apex

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ID = 82619
       
Country:
Great Britain (UK)
Brand: Apex Valve Company (The); London
Developer: Apex Valve Company (The); London 
Tube type:  Triode, vacuum   Power/Output 
Identical to P4_Apex

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / Direct / Battery =
Information source -- Original prospect or advert   Popular Wireless UK 25/4/1925

b4_base_pins~~179.png P4_Apex: Fin Stewart
Fin Stewart


Just Qvigstad
gb_apex_valve_p4.png
P4_Apex: Wireless Weekly Oct 7, 1925, Pages 94.
Gary Cowans

 

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