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ID = 29021
United States of America (USA)
Brand: Connecticut Telephone & Electric Company (Sodion); Meriden (CT)
Developer: Connecticut Telephone & Electric Company (Sodion); Meriden (CT) 
Tube type:  Gas Triode   Detector 
  <1925 very rare. ***
Identical to Sodion_S11
First year 10.Oct.1923 Saga of the Vacuum Tube, Tyne page 339, picture page 342.
Predecessor Tubes Donle-Detector   J-117-Connecticut  
Successor Tubes Sodion_S13  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Direct / Battery =
Description Designer was Dr. H.P. Donle, then still chief engineer at Connecticut Telephone and Electric Company, Meriden, Connecticut, USA. In 1925 Dr.Donle left Connecticut and Electric Company to establish his own company, the Donle Bristol Corporation of Meriden, Connecticut, where later sodion types were developed and manufactured. See Tyne, beginning page 336. The S11 tube is a sodium vapour detector tube and uses a "collector" element near the filament but not actually between the filament and the anode. 
Text in other languages (may differ)
Information source Radios von gestern, 2. Auflage   page 213
Saga of the Vacuum Tube, Tyne   page 339
-- Collector info (Sammler)
Sodion_S11: Joe Knight /
Joseph Woychowski

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