Classic ground loop

Posted by Chris O on September 15, 2012 at 11:14:37

In Reply to: re: still trying to track down a hum... posted by mr9iron on September 15, 2012 at 10:11:35:

Your left and right RCA input jack grounds should be tied together right at the jack. Then then that single ground should be tied to the signal ground of the circuit like it was prior to the modifications. When you use your meter you should measure less than 1 ohm resistance to ground. The hum is limited to the input section, not the power supply or anything a cheater plug will help you with because it stops when you short the inputs.

I will bet that if you disconnect the ground from the RCA jacks, one might still be grounded through the chassis. You might also have a bad solder joint on the RCA jack ground. You can't create a loop if there is only one path, somehow you have more than one. Keep looking, you will find it.

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Follow Ups Full Thread

Topic - re: still trying to track down a hum... - mr9iron 01:41:53 09/15/12 (16)

re: still trying to track down a hum... - Ron V 03:43:27 09/21/12 (1)

re: still trying to track down a hum... - mr9iron 14:18:17 09/21/12 (0)

re: still trying to track down a hum... - DannyR 12:10:52 09/19/12 (0)

re: still trying to track down a hum... - FenderLover 06:41:24 09/17/12 (1)

re: still trying to track down a hum... - mr9iron 10:45:20 09/17/12 (0)

re: still trying to track down a hum... - Tre' 07:07:06 09/15/12 (10)

re: still trying to track down a hum... - mr9iron 10:11:35 09/15/12 (9)

re: still trying to track down a hum... - mr9iron 02:05:33 09/16/12 (3)

re: still trying to track down a hum... - Tre' 13:46:52 09/18/12 (2)

re: still trying to track down a hum... - mr9iron 14:08:34 09/18/12 (1)

re: still trying to track down a hum... - Tre' 11:01:54 09/19/12 (0)

re: still trying to track down a hum... - Tre' 17:28:03 09/15/12 (2)

re: still trying to track down a hum... - mr9iron 20:19:30 09/15/12 (1)

re: still trying to track down a hum... - Tre' 07:37:29 09/16/12 (0)

Classic ground loop - Chris O 11:14:37 09/15/12 (1)

RE: Classic ground loop - mr9iron 20:25:51 09/15/12 (0)

Follow Ups

Classic ground loop - Chris O 11:14:37 09/15/12 (1)

RE: Classic ground loop - mr9iron 20:25:51 09/15/12 (0)

Classic ground loop

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