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ID = 28684
Russian Federation
Brand: Tversk Station, Tver region
Developer: Tversk Station, Tver region 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to PR1
First year 1919 ?? Saga of the Vacuum Tube, Tyne page 273
Predecessor Tubes TM  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Military and/or Government
Filament Direct / Battery =

Tube designed by Mikhail Alexandrovich Bontsch-Brujewitsch. He studied the design of the French TM tube and developed a similar style tube. The main difference was that the anode was a sheet of aluminium. This was necessary as normal metals used in anodes was not available at the time. According to Tyne, the tube was perfected towards the end of 1919.

Text in other languages (may differ)
Information source Saga of the Vacuum Tube, Tyne   Pages 272-273

b4_1~~62.png PR1: Fin Stewart
Fin Stewart

Just Qvigstad

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