Hi, I just bought a A.R.D-90 and there is a hum in the right channel.I reversed the inter-connects and still in the right side.I switched the 12ax7's for 12au7's and it got louder.Any ideas or insight? Bill
Reverse the tubes you just installed from channel to channel and see if the hum follows the tubes. It could easily be in one of the tubes you just changed.
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