Maybe this will help someone who is dealing with turntable ground loop buzz. For a while my buzz was fixed ala ground lift adapter. But for some reason, two days later the buzz was back with a vengeance. This was perplexing bc I literally had not changed a thing.
I started going thru the paces of checking my ground wire, interconnects, etc. Somehow, thru my building frustration, an idea appeared. I remembered from my previous life working in recording studios that dimmer switches were not looked up favorably. As a shot in the dark, I walked to the dimmer switch in our den, turned the light off, and poof! That was the end of the buzz. I went further and found that the dimmer in our adjoining dinner room also has an effect, though to a lesser degree.
Needless to say, I now enjoy my system while sitting in the dark.