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ID = 30800
United States of America (USA)
Brand: Donle-Bristol Co., Meriden, Conn.
Tube type:  Gas Triode   Detector 
Identical to DP-11
First year 1927 Saga of the Vacuum Tube, Tyne page 341.
Predecessor Tubes DP-10  

Description Designer was Dr. H.P. Donle, before 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 340. The DP-11 is the last mentioned Sodion tube from Donly, described at Tyne. 
Information source Saga of the Vacuum Tube, Tyne   

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