I just upgraded two dual OP amps in my T-85. I learned about the LM4562 DIP unit and the BrownDog adapter unit a few weeks ago. I upgraded the mux buffer (unity gain) and the output section from the old 9-pin style. See photo. The BlackGate rail caps and the WIMA outputs have been in place for some time. The only reason I have this tuner is because we have WFMT here in Chicago. I'll try to evaluate the sound quality over the next two weeks or so. (When their pledge drive is over.)
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Topic - Yamaha T-85 - jtpzenith 10:44:34 04/18/14 (0)