[tdelahanty]

I'm not familiar with the grounding scheme of your new amp. Hope I wasn't too technical, simply put grounding is the key to proper operation. Some amps, like my Levinson, have two ground circuits, chassis gnd. and signal gnd.. Signal gnd. is 10 ohms above (higher) chassis to prevent noise from degrading the input signal. So I had similar issues. This is not a defect, just requires a different solution.