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W307_Marathon

Information - Help 
ID = 50810
       
Country:
Netherlands
Brand: Marathon (tubes), Radio-Marathon, N.V. Rave; Amsterdam, Eindhoven
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to W307_Marathon
Similar Tubes
Normally replaceable-slightly different:
  AR4101 ; E438 ; REN1004 ; W4080

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect
Description

Detectoe and LF amplification, resister coupling.

 
Information source - - Manufacturers Literature   1935

7_19~~1.png W307_Marathon: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
w307data.png
W307_Marathon: own collection
Peter den Boer

 

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