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2-443

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ID = 10533
       
Country:
Netherlands
Brand: Thermion; Netherlands
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 2-443
Similar Tubes
Normally replaceable-slightly different:
  B443
Production stop Feb.1938

Base Europe 5-Pin (O5A, B5) (Codex=Foo)
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Battery = /
Description To avoid the Philips penthode patent, Thermion calls it a tetrode because the surpressor grid is connected to the grid instead of the kathode/filament. Nevertheless, this is a plug-in replacement for the B443. Also available with B4 base + sidecontact. 
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1933
 
2443base.png
2-443
Peter den Boer

 
24431data.png
2-443: own collection
Peter den Boer


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