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W420

Information - Help 
ID = 2805
       
Country:
Austria
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  TRIODE (Detail uncertain) 
Identical to W420
Similar Tubes
Normally replaceable-slightly different:
  B438 ; HR410 ; R406 ; W406 ; W411
Heater different:
  HR607

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 4 Volts / If 0.1 Ampere / Direct
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
w420.jpg
W420: K.K.
Anonymous 719 Collector

 
w420_so.png
W420: rtt
Michael Schlör

 

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 a member from D

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