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ID = 7944
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to IW4/500
Similar Tubes
Normally replaceable-slightly different:

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

500v rms/plate; 120mA dc output.

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

150_6~~1.png IW4/500: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
IW4/500: Mullard - original papers
Wolfgang Romeyke

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