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Thank you all for your help! Per mbz I'm getting a standalone pre-amp to help diagnose the pre-amp stage in my McIntosh and bound the problem somewhat. Due to a room configuration I can't place the turn table too close to the McIntosh anyway, so a separate pre-amp appears to be the way to go for...

I have Macintosh ma 6100 and I have been using it for a while combined with a dac through aux input. It always had a low, barely noticeable 60hz hum through both speakers. I just got a turn table and unsurprisingly the hum is more noticeable through phono input. The hum is present without any...