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ID = 51330
United States of America (USA)
Brand: Electron Mfg. Co.; Berkeley, CA
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to Electron_Audio
Similar Tubes
Normally replaceable-slightly different:
  AudioTron ; Oscilaudion ; Thermotron
First Source (s)
1915 : -- Original prospect or advert

Base Wires
Filament Vf 6 Volts / Direct / Battery =
Description Double filament vacuum triode.
Available as:
Supersensitive detectors and amplifiers $6.50
Supersensitive oscillators $6.50
Combination of above $7.50
Single filament $1.00 less

Must not be confused with the "Electro-Audion" which is described in Tyne around our "Electron Audio"! 
Information source Saga of the Vacuum Tube, Tyne   advert p.186
Peter den Boer

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Electron_Audio: own collection
Peter den Boer

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