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ID = 50630
United States of America (USA)
Brand: Connecticut Telephone & Electric Company (Sodion); Meriden (CT)
Tube type:  Gas Triode   Detector 
Identical to A_Donle
Similar Tubes
Other base:
First year 1919 Saga of the Vacuum Tube, Tyne page 336.
Successor Tubes 1919   C_Donle  

Was used by Radio/TV-reception etc.
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. This tube, Type-A Donle, was the first attempt to working around patents, both, Type A and Type B were not built into models, but the follower, J117 into the receiver Sodion JR-3 - but this had to be brought back to convert into model DR-6 with other tubes. This tube appears to have a bayonet Ba15D 15 mm diameter base. The type A was also fitted with a Shaw UV base. 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 glass 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 glass, where it flanged out to a larger diameter. The voltage on the anode was 20. 
Information source Saga of the Vacuum Tube, Tyne   Pages 336-338
A_Donle: R.O.
Rudolf Osterkamp


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