There is a AA-121 manual with schem. on the hifiengine. You'll need to register for the download. The quality isn't the best, but it's free.
Heathkit AA-121 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine
jeff
Heathkit AA-121 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine
jeff
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