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

Base Europe 4-Pin (A, 4A, B4, since 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)
Literature Saga of the Vacuumtube, Tyne   Pages 272-273
PR1: Fin Stewart
Fin Stewart


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