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aa-40

  1. david winter

    Heathkit AA-40 - strange voltages at 6AN8A plates

    Hi, I have been working on a Heathkit AA-40 amp for which I did the following works: - Set to 230V mode (powered at 240Vac). - Surgistor replaced with CL-90 varistor - Tubes: two NOS Sylvania 6AN8A + four good EL34 - All electrolytics and coupling caps replaced - Most resistors replaced (out of...
  2. H713

    Heathkit AA-121 Restoration

    I just bought a Heathkit AA-121 on eBay for $200 shipped. The guy said that he "plugged it in, 15 seconds later saw smoke and turned it off". The pictures do not show tubes, but who knows if it had them when he tested it. I have an extra output transformer for this amp, so as long as both aren't...
    • H713
    • Thread
    • aa-121 aa-40 el34 heathkit smoke
    • Replies: 2
    • Forum: Tube Audio
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