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Thermotron

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ID = 51306
       
Country:
United States of America (USA)
Brand: ThermoTron Company; Los Angeles
Tube type:  TRIODE (Detail uncertain)   Universal 
  <1925 very rare. ***
Identical to Thermotron
Similar Tubes
Normally replaceable-slightly different:
  AudioTron ; Electron_Audio ; Oscilaudion
First Source (s)
Jul.1916 : -- Original prospect or advert

Base Wires
Filament Direct / Battery =
Description Advertisement in Elect.Experimenter July 1916. Price $5.25.
Virtually similar the same tube was offered as "Oscilion" for $7.50. 
Information source Saga of the Vacuum Tube, Tyne   p.166

 

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