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ID = 12317
Brand: Thermion; Netherlands
Tube type:  Screen-grid Tetrode 
  Ca. 1925 up to 1945 very rare. ***
Identical to 2-442
Similar Tubes
Normally replaceable-slightly different:
Production stop Feb.1938
Predecessor Tubes DS1_Thermion  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Dimensions (WHD)
incl. pins / tip
49 x 132 x 35 mm / 1.93 x 5.20 x 1.38 inch
Weight 68 g / 2.40 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1933

2442base.png 2-442
Peter den Boer

Just Qvigstad
2-442: own collection
Peter den Boer

Collection of



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