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ID = 29001
United States of America (USA)
Brand: Connecticut Telephone & Electric Company (Sodion); Meriden (CT)
Tube type:  Gas Triode   Detector 
Identical to C_Donle
First year 1919 Saga of the Vacuumtube, Tyne page 337, picture
Predecessor Tubes A_Donle  
Successor Tubes 1923   J-117-Connecticut  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
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. In developing this tube, Donle experimented with various metals as a successful external anode. He eventually settled on a thin silver tube which was placed over the inner glass tube. This tube also contained the filament and spiral grid. Because of the heat generated by the filament and its close proximity to the glass tube, a small hole, or vent, was made in the lower part of the tube where it flanged out to a larger diameter. The voltage on this anode was 20. 
Literature Saga of the Vacuumtube, Tyne   Pages 336 - 338
C_Donle: R.O.
Rudolf Osterkamp


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