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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.
128x128767400
jea48
4,423 posts
 
A broken, open, signal ground return connection on an IC would be my first guess. Can you check the ends on the ics?
767400's avatar
767400 OP
11 posts
 
I'll start swapping one out at a time and see what happens.

Thank you.
767400's avatar
767400 OP
11 posts
 
Solved! The "R" AUX RCA input jack on my C-2200 is bad. The short is inside the barrel somewhere.

Now the next question. Does anyone have a good repair place for McIntosh's, preferably in the South East?

Thanks.
tls49's avatar
tls49
1,351 posts
 

For Authorized McIntosh Service, use your zip code in this Service Locator.

You should be able to use another input. If AUX was used for HT bypass, then you would need to change HT bypass in the preamp's setup menu to the other input selected.
zd542
5,339 posts
 
If you can't find anyone local, I would try Audio Classics in Vestal NY. Its one of the best places for McIntosh repair.
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