Neuheiten der Einzelteile-Industrie
Hescho ceramic valve design
(German language, pdf)
The German industry successfully brought ceramic valves (tubes) to maturity. In this respect, Telefunken (> 1941) produced ceramic coaxial “lighthouse” like valves (LD9, LD10, LD11, LD12). In contrast to US practice, German ceramic valves could be fully integrated into cavities. Whereas US practice was, that their valves (tubes) still employed regular octal base sockets.
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