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ID = 73898
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Gas Diode   Detector 
  <1925 extraordinarily rare. Production was less than 100 items. ****
Identical to Audion_01-twoelectr
First year 1906 Saga of the Vacuum Tube, Tyne
Predecessor Tubes Fleming_exp  
Successor Tubes 1907   AUDION_DeForest  

Base Edison (candelabra) 12 mm
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / Direct / Battery =
Description This tube is first made late in 1905 by H. W. McCandless and Company for the de Forest Radio Telephone and Telegraph Company. It had a four volt carbon filament and was fitted with an E12 Edison screw base. The nickel anode "lead-in" wire entered the glass bulb a few millimetres from the exhaust tip at the top of the bulb. de Forest had acquired a Fleming two electrode tube and asked McCandless if he could make six copies. de Forest applied for a patent on May 19th, 1906 and this was granted on November 13th of the same year. the patent number is 836070. The successors were the Audion_02-electrostatic and Audion_03-electromagnetic developed late in 1906. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x x 25 mm / x x 0.98 inch
Information source Saga of the Vacuum Tube, Tyne   Pages 53,55,&58

Audion_01-twoelectr: Fin Stewart
Fin Stewart



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