Sunn Concert Slave from early 70s. Same output section as the Concert Lead and Concert Bass. Not sure if it was the same as the Concert Controller, which was the PA version. I think it was.
Not too much going on here, just needed a few new caps and a broken AC power cord replaced.
Never found the schematic, but you could just consult the output section of one of the other Concert series amps of this era.
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