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W20

Information - Help 
ID = 8464
       
Country:
France
Brand: Grammont (Radiofotos, Fotos); Paris, Malakoff
Tube type:  Half-Wave Vacuum Rectifier 
Identical to W20
Similar Tubes
Heater different:
  1832

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament Vf 7.5 Volts / If 1.5 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
w20_grammont.jpg
W20: aus ebay, mit Erlaubnis des Verkäufers radioseller124
Gottfried Silberhorn

 
w20_so.png
W20: rtt
Michael Schlör

 
w20datasmall.png
W20: own collection
Peter den Boer


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