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ID = 45193
United States of America (USA)
Brand: General Electric Co. (GE); Bridgeport CT, Syracuse NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Secondary Emission Triode 
  <1925 no serial production. For instance only development samples. *****
Identical to Dynatron
Successor Tubes Pliodynatron  

Base Side contacts
Filament Direct / Parallel, (AC/DC)
Description This tube has three electrodes:
A filamentary cathode, a helical anode at high potential and an outer cylinder called "3rd electrode" kept at a lower potential.
The secondary electrons bounced back from the 3rd electrode are collected by the anode. The Dynatron behave as a true negative resistance device.
See also Pliodynatron. 
Text in other languages (may differ)
Literature Patent   US 1 387 984
Saga of the Vacuumtube, Tyne   p.146
  Dynatron: US Pat. 1387986
Wolfgang Holtmann
Dynatron: Goldsmith: Radio Telephony (1918)
Georg Richter

Dynatron: US Pat. 1387984
Wolfgang Holtmann

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