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W420

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ID = 2805
       
Country:
Austria
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  Triode, vacuum   Audio Frequency 
Identical to W420
Similar Tubes
Normally replaceable-slightly different:
  B438 ; HR410 ; R406 ; W406 ; W411
Heater different:
  HR607

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   

w420_so.png W420: rtt
Anonymous 10 Collector


Just Qvigstad
Usage in Models 1= 1931 ; 1= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2

Collection of

Collection of a member from D
 
w420.jpg

 

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