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Old 6th April 2020, 02:59 AM   #1
brl0301 is offline brl0301
diyAudio Member
Join Date: Dec 2019
Default Intermittent Ground Loop Issue

Hey everyone, I am the happy owner of a tse ii that I built a few months back. Ive always had a low level hum that is audible from my seating position (about 10') but isn't audible once I start playing music. I just figured it was a reasonable level and didn't worry much about it. The odd part is that about once a week the hum will get extremely loud, enough to overpower the music. The loud hum seems to come and go at will but only about once a week.

I've tried a few things to troubleshoot so far:

-Lifted the ground on the tse. This makes the amp dead quiet even when the loud hum is occurring

-Connected a standalone DAC. This also made the amp dead quiet

- Disconnected the coax cable into my cable box. This got rid of the loud hum but still left the lower level hum

My thinking is that the loud occasional hum is coming from the cable box. Would it make sense for this to be intermittent and not all the time.

My second thought is that there is a ground loop occurring between my Denon AVR, which I am using as a pre-amp into the tse. This would explain why running an external DAC would eliminate the lower level hum.

Sorry for the super long post. Im just trying to work my way through the issue and come up with a solution.

Does anyone have any thoughts on the issue or possible solutions? Thanks!!


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