Vol. 7, No. 1April 18, 2023August 15, 2023By Libby5 View Fullscreen On the Cover A reproduction of De Forest catalog art: images of the 500 and 504A triodes. The artist’s originals can be yours, via the CC-AWA auction planned for March. See p. 1 for details. In this issue De Forest’s Numeric Code Undocumented Aliens – A new Look Electron Tubes in Western Union Service 6F6EG? 41E? 7J7E? Say What? The “Most Popular” Final-Amp Tubes More on “DOD” Tubes Author Index
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