Antique radios, Old Time Radios
C_Donle
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Country:
United States of America (USA)
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| Identical to |
C_Donle
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| First year |
1919
Saga of the Vacuum Tube, Tyne page 337, picture
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| Predecessor Tubes |
A_Donle
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Successor Tubes
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1923
J-117-Connecticut
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| Base |
UV-Base (4 Pins+Bayonet, USA 1914 WE)
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| 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.
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| Information source |
Saga of the Vacuum Tube, Tyne Pages 336 - 338
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Just Qvigstad
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Collection of
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