I will can and upload the manual if anyone is still interested. I bought this amp in 1967 (along with the TX91100 tuner) which is now, sadly, finally failing on one channel.
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Pioneer SA-9100 User Manual
I too am looking for the user manual after acquiring one of these beauties on EBay.
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I'll upload the manual next week
I'll scan and upload the Operating Instructions, Features manual and electrical schematic next week.