A broken, open, signal ground return connection on an IC would be my first guess. Can you check the ends on the ics?
Ground Loop Video and advice.
http://s1343.photobucket.com/user/fkmc123/media/IMG_1696_zps39c20b57.mp4.html
Any idea why this would be happening and a solution to fix? The two interconnects are L/R RCA's coming from my receiver to a Preamp. The power cable is from the preamp to a Richard Grey 1200C. Any time the power cable is not touching the two RCA's there is a ground loop. Or if I touch the RCA's the loop stops but not all the time. I've tried lifting the Preamp, with no change.
Thanks to anyone who can help.
Any idea why this would be happening and a solution to fix? The two interconnects are L/R RCA's coming from my receiver to a Preamp. The power cable is from the preamp to a Richard Grey 1200C. Any time the power cable is not touching the two RCA's there is a ground loop. Or if I touch the RCA's the loop stops but not all the time. I've tried lifting the Preamp, with no change.
Thanks to anyone who can help.