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
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
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
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
It would have to be long enough for me to reach the kitchen fridge to grab another cold one.....
... I am allowed to jest - having a nagging grounding/noise issue with my own circuit as well...
See: http://www.diyaudio.com/forums/tubes-valves/221110-locating-hum-source-3.html#post3202881
Andreas
See: http://www.diyaudio.com/forums/tubes-valves/221110-locating-hum-source-3.html#post3202881
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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