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Did you move any of the positions (or relative positions) of the power cables (and phono cables?)
Try to avoid running power and phono cables alongside each other and if they need to cross each other try to do so at 90 degrees.Good tip. I moved the speaker cable and ICs as far as possible away from any power cables, more so during the above testing. But these little Cyrus amps are so small, everything is rather crowded back there.
Did you move any of the positions (or relative positions) of the power cables (and phono cables?).
Try to avoid running power and phono cables alongside each other and if they need to cross each other try to do so at 90 degrees.