The amplifier assuredly has a minor fault that wasn't always there, otherwise
every man and his dog would have complained about a buzz from their tweeters,
with an up-market amplifier, right around the globe.
It's not so complex for a 3 channel amplifier and some boards/sections can be
disconnected, maybe helping to isolate the source. The bridge rectifiers and their
wiring could be candidates, as could the balanced/unbalanced input conversion
opamps and their supply.
Being a common fault to all channels, it can't be too hard to locate and it seems
like high harmonics of rectifier switching, to me. Id start by removing power to the
5532 opamps (connector K981A) and go from there - gently of course
every man and his dog would have complained about a buzz from their tweeters,
with an up-market amplifier, right around the globe.
It's not so complex for a 3 channel amplifier and some boards/sections can be
disconnected, maybe helping to isolate the source. The bridge rectifiers and their
wiring could be candidates, as could the balanced/unbalanced input conversion
opamps and their supply.
Being a common fault to all channels, it can't be too hard to locate and it seems
like high harmonics of rectifier switching, to me. Id start by removing power to the
5532 opamps (connector K981A) and go from there - gently of course
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