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L409

Information - Help 
ID = 12789
       
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 L409
Similar Tubes
Normally replaceable-slightly different:
  A2004 ; A442 ; B442 ; RES094 ; S407

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Er) Top contact screw type
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Description It is claimed that the L409 can be used for HF, LF, MF amplification and as a detector, resistor coupling. 
Dimensions (WHD)
incl. pins / tip
45 x 128 x 34 mm / 1.77 x 5.04 x 1.34 inch
Weight 48 g / 1.69 oz
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1935
 
l409.jpg
L409
Peter den Boer

 
3_1~~1.png
L409: Telefunken Werkstattbuch
Wolfgang Bauer

 
l409data.png
L409: own collection
Peter den Boer



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