I have no real answer to why it seems susceptible to ground loops. It would need a very detailed investigation and examination of the grounding layouts internally in the amp and externally.
The NAD should should be fixable 🙂
The NAD should should be fixable 🙂
Hopefully!
I may be partly there - I've started a separate thread
http://www.diyaudio.com/forums/solid-state/228950-nad-7240pe-questions.html
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