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My motto is "Live each day as if there's no tomorrow ".Schade, RCA publication ST-59, March, 1938 - A very nice technical paper about beam-power tubes, their operation, and application in audio power amplifiers 1941 Phototubes (PDF, 3.2MB) - Courtesy of John Atwood 1960 Receiving Type Tubes for Industrial and Communications short-form data (15MB PDF file) 960 RCA Interchangeability Guide, (5.1Mb PDF file) - Tube substitution manual - - Thanks to Gary Smith!1956 RCA Reference Book (28MB PDF file) - This consists of an introduction (including some schematics) and individual tube datasheets, which were in a binder like the RCA HB-3.Includes most of Tung-Sol's tubes made between the 1930s up to 1948.includes the old 2-digit tubes, octals, loctals, and 7- and 9-pin-miniature tubes.

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