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Bi2

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ID = 49144
       
Country:
France
Brand: Microlux, A. Bertrand; Paris
Developer: Microlux, A. Bertrand; Paris 
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to Bi2

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 3.5 Volts / If 0.06 Ampere / Direct / Battery =
Description This tube is identical to the A1, but the Bi2 has a spare filament. 
Information source - - Manufacturers Literature   
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Just Qvigstad
datablad3valvessmall.png
Bi2: own collection
Peter den Boer

 

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