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List of vacuum tubes — This is a list of vacuum tubes or thermionic valves. Before the advent of semiconductor devices, hundreds of tube types were used in consumer and industrial electronics; today only a few types are still used in specialized applications. Contents… … Wikipedia
Pentagrid converter — For other types of frequency converters please, see Frequency converter. The pentagrid converter is a radio receiving valve (vacuum tube) with five grids used as the frequency mixer stage of a superheterodyne radio receiver. Grids of a 12SA7GT… … Wikipedia
RMA tube designation — In the years 1942 1944, the Radio Manufacturers Association used a descriptive nomenclature system for industrial, transmitting, and special purpose vacuum tubes. The numbering scheme was distinct from both the numbering schemes used for standard … Wikipedia

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