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ID = 7943
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to IW4
Similar Tubes
Normally replaceable-slightly different:
  IW4/350 ; R2
First Source (s)
22.Nov.1935 : Wireless Weekly (Australia)
Successor Tubes CV1039  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Em)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2.4 Ampere / Half indirect

350V rms per anode; 120mA dc mean.

Information source History of the British Radio Valve to 1940   p. 149 & 176
Babani, International Radio Tube Encyclopaedia   p. 280 & 281
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

iw4_sock.png IW4: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

More ...

Just Qvigstad
IW4: Mullard Valves 1936
Peter Hoddow

Usage in Models 3= 1931 ; 1= 1932? ; 4= 1934? ; 1= 1936? ; 1= 1936 ; 2= 1937? ; 1= 1938

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):13

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