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ID = 73897
Brand: Tokyo Electric Co. (TEC); Tokyo
Developer: Tokyo Electric Co. (TEC); Tokyo 
Tube type:  Gas Triode   Detector 
  <1925 very rare. ***
Identical to AUDION_Japan = UN-100
First year 1917 -- Original-techn. papers.

Was used by Radio/TV-reception etc.
Filament Direct / Battery =

Described in "Dawn of Japanese Tube Production" written by Hisashi Ohtsuka from "On some Home-made Triode" by Dr. Hidetsugu Yagi, in Japanese, IEEJ Bulletin (Denki-Gakkai Zasshi), 1921. See also Tyne, page 277 for early tubes from Japan, but he starts with the ANNAKA-AAB-5 and P.V.-30 only. At least Mitsui Company was buying two pieces of everything de Forest sold.

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