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Replace the PSU's SS diodes with Low-noise

Posted by Timbo in Oz on March 13, 2017 at 03:40:23:
soft recovery Schottky diodes, AND up the capacitance in the PSU to about twice the OEM uf total. And, bypass the last two PSU caps with MF PP* caps.
After that work, have the amp biassed a little more into a watt or three Class-A.
Then listen, then replace the negative-feed-back-loop caps and Rs with commercial quality teflon caps and Holco or laser trimmed Rs. Possibly, do this before recapping and re-R-ing the audio stages.
Re-listen. and then budget for replacing, any and all electrolytic signal caps with commercial quality *metallised-film poly-propylene caps. Replace all the signal Rs with decent metal-film Rs.
Re-check and re-set the DC and AC balance, in the PP output stages
IF you do this over a good space of time, all this ought to be affordable, even through a techie.