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Old 15th March 2013, 06:23 PM   #1
garpt is offline garpt  United States
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Default Nagging Ground Issue

Hi all,
Just completed a build of the Elliot P06 phono stage. It sounds terrific. It is being powered by a +/-15VDC hospital-grade power supply, which previously worked great on my Lehmann Black Cube with no issues.
I have all the RCA inputs/ outputs isolated from the case and grounded together. Checked all ground points on the PCB, very strong continuity. No unusual hum issues with my other preamps. When I touch the ground wire, the hum goes away. However, grounding the TT to the ground lug I installed makes no difference. Running a temporary ground wire from the PCB to *Anything* (so far) makes absolutely no difference. The ONLY thing that makes the hum stop is me holding the ground wire.
What should I look for? Any ideas for a permanent (proper) fix would be appreciated!

Thanks.
Gary
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Old 15th March 2013, 09:24 PM   #2
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Hi Gary

have you made your own pcb or used the Elliot .
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Old 15th March 2013, 09:29 PM   #3
garpt is offline garpt  United States
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Hello,
I used the Elliot pcb. I don't think I would trust myself with a breadboard or some such (yet). I have tried every grounding point I can think of and tried removing the ground leg on the power supply as well, although I do not believe this is a ground "loop", per se, because of the way it behaves.

thanks. Gary
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Old 15th March 2013, 09:29 PM   #4
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Quote:
Originally Posted by garpt View Post
Hi all,
The ONLY thing that makes the hum stop is me holding the ground wire.
Any ideas for a permanent (proper) fix would be appreciated!
A nice piercing with a ground lug and a long cable would do....

*SCNR*

Rundmaus
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Old 15th March 2013, 09:34 PM   #5
garpt is offline garpt  United States
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Quote:
Originally Posted by Rundmaus View Post
A nice piercing with a ground lug and a long cable would do....

*SCNR*

Rundmaus
It would have to be long enough for me to reach the kitchen fridge to grab another cold one.....
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Old 15th March 2013, 10:15 PM   #6
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... I am allowed to jest - having a nagging grounding/noise issue with my own circuit as well...

See: Locating hum source

Andreas
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Old 16th March 2013, 12:31 AM   #7
garpt is offline garpt  United States
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Quote:
Originally Posted by Rundmaus View Post
... I am allowed to jest - having a nagging grounding/noise issue with my own circuit as well...

See: Locating hum source

Andreas
There's nothing (almost) more frustrating for a DIY'er at my level, anyway.
Thanks for the link. I will explore some more....

Gary
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