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W409

Information - Help 
ID = 13165
       
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 W409
Similar Tubes
Normally replaceable-slightly different:
  E442 ; RENS1204

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fc) Top contact screw type.
Filament Vf 4 Volts / If 1 Ampere
Description HF amplification. 
Dimensions (WHD)
incl. pins / tip
49 x 141 x 34 mm / 1.93 x 5.55 x 1.34 inch
Weight 62 g / 2.19 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1935

9_10~~1.png W409: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
w409data.png
W409: own collection
Peter den Boer

Collection of

 
w409marathon.jpg

 

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