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heathkit aa-1640

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    HeathKit AA-1640 meter calibration

    Does anyone have the service manual on this model that can post the procedure of calibrating the front dB/watts meters? I’ve done a restoration of one that was given to me. Sounds great. I have zeroed the meters with the set screws on the front, but there is a variable resistor to set the...
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    Successful Recap - Heathkit AA-1640

    Howdy all, After being down for maintenance for nearly a year, I've finally finished replacing all the electrolytic caps in my Heathkit AA-1640. I got it off Facebook Marketplace from a guy who had it sitting in his closet for a few decades, and it worked quite nicely, but better to be cautious...
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    Heathkit AA-1640 recap assorted questions

    Howdy, I'm doing a recap on my Heathkit AA-1640 to bring it into the modern area and hopefully in service for many more years. As this is my first foray into doing this, I've run into some things and have some questions. 1. There are some low-voltage non-polar electrolytics on the amplifier...
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