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FW4/500

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ID = 7804
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to FW4/500 = 4/100BU = NU12
Similar Tubes
Normally replaceable-slightly different:
  AZ50 ; PV4201 ; RB650/250
Other characteristic (electr. data):
  CV31 ; FW4/800
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 3 Ampere / Direct / Specified voltage AC/DC
Description

Mullard etch code 1130

 
Information source History of the British Radio Valve to 1940   p. 151
Babani, International Radio Tube Encyclopaedia   p. 276 & 277
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49
17_75.png FW4/500: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		fw4500_mullard_data_01.png
FW4/500: Mullard-original papers
Bernd Staginnus
More ...
Usage in Models 1= 1940? ; 1= 1945?? ; 3= 1948 ; 1= 1949
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):6

Collection of

Ken Shellberg (USA)
Hannu Alho (FIN)
 
fw4_500a.jpg

FW4/500
 
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