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ID = 20417
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to 431U
First Source (s)
1937 : History of the British Radio Valve to 1940 p.138 &175
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2.5 Ampere / Half indirect / Specified voltage AC/DC

b4_rectifier_single_anode~~3.png 431U: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1938? ; 6= 1938 ; 5= 1939 ; 1= 1940? ; 8= 1940 ; 2= 1942 ; 1= 1946

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):24

Collection of



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