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W406_Marathon

Information - Help 
ID = 20361
       
Country:
Netherlands
Brand: Marathon (tubes), Radio-Marathon, N.V. Rave; Amsterdam, Eindhoven
Tube type:  Screen-grid Tetrode 
  Ca. 1925 up to 1945 rare.
Identical to W406_Marathon
Similar Tubes
Normally replaceable-slightly different:
  B400

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Filament Vf 4 Volts / If 1 Ampere / Direct
Description LF amplification and power/output in Class A and Class B (2 W406 in push-pull) amplification. See datasheet. 
Information source - - Manufacturers Literature   1935
 
w406data.png
W406_Marathon: own collection
Peter den Boer


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