Other people at a different forum have also suggested that it is a ground loop problem. I will check again.
Newbie hook-up question w/ ARC PH-3 SE
I've just purchased a second-hand ARC PH-3 SE. I hooked it up to my LS-2B MkII, and an old swiss-made Lenco turntable that I borrowed from a friend's dad. When I turn the system on (and volume up), all I hear is a loud hum coming out of my speakers. Did I connect the ground incorrectly? When I disconnect the turntable from the pre, the hum disappeared.