Many files on this site, especially scanned documentation, are in Adobe Acrobat (PDF) format.
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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They generally follow the following format: (example) 322 5904 where 322 is the manufacturer code (in this case Tungsol), 59 is the year (1959), and 04 is the week.
One alternate scheme is: 274 940 274 is the EIA code (RCA) 9 is the last digit of the year (in this case 1949).By 1906 they were building arc radio transmitters, and by 1907 were demonstrating radio transmission of music, only a year after Fessenden used his microphone to broadcast voice in the USA.By 1935 they were building the first tape recorders, along with AEG in Germany, and by 1936 were transmitting the first television broadcasts of significant power, that being the coverage of the Olympic games in Berlin.I am working on posting the RCA HB-3 Tube Handbook on line on this site (on it's own page).I've also posted Sylvania tube manuals on their own page.Below each frame there is a bit of rhyme in German telling the tale.