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aa-21

  1. P90

    Heathkit Blues with AA-21 Amp

    Hi everyone. I acquired a super-rare NIB un-assembled Heathkit AA-21 amplifier that I just finished assembling moments ago. Being that the kit is so old (even though the box was still sealed), I used new electrolytic capacitors and 1% metal film resistors instead of the originals. I didn't...
    • P90
    • Thread
    • aa-21 heathkit repair troubleshooting
    • Replies: 78
    • Forum: DIY
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