luddite Posted September 25, 2016 Share Posted September 25, 2016 This may be a bit beyond the 2-Channel forum postings; my system is more of a 4-Channel setup. I cranked up my system tonight, as the wife was out. I started with some LP's on my Merrill-Modified Thorens 160HD turntable into a McIntosh MC130 preamp. Twin monoblocked McIntosh MC2125 powered Belles in the front, and McIntosh MC2200 powered Fortes in the rear. Once I had the volume up to 50/100 on the preamp, there was a hum which became progressively louder as the volume increased, to the point it overpowered the sound of the music. I normally listen at volume levels of 15-30/100 on the preamp, so I had not noticed this before. The hum was not present when I listened to CD's through my McIntosh MCD 7007 CD player, regardless of the volume. The turntable is grounded. Everything is plugged into a MonsterPower HTPS 7000 Powersource. I'm getting some serious feedback (not the good kind) from the turntable. Any ideas of where I should look to resolve the issue? I rarely, if ever push this system. Still, I would like to keep the sound from the turntable as pristine as I can. Quote Link to comment Share on other sites More sharing options...
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