Https://www.allaboutcircuits.com/textbook/direct-current/chpt-14/electromagnetic-induction/
The AC power changes the magnetic field and may be being picked up in your amplified leads .
Or the DC voltage in your amps power supply is not filtering the power after it rectifies the AC power .A really big capacitor across the dc voltage output from the rectifier should filter any AC out.
https://www.allaboutcircuits.com/textbook/experiments/chpt-5/rectifier-filter-circuit/
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