Another WW2 era tube reference that's actually a very good introduction: https://www.americanradiohistory.com/Archive-Rider/BOOKS/Inside-the-Vacuum-Tube-Rider-1945.pdf
@frenchbat the whining noise or the presentation? :P @ogodei looks cool! Downloaded and will read in my spare time. So long as it's not too complicated I might actually enjoy it, haha.
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