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Grounding A Preamp

I have a NAD 1155 preamp with a nasty buzz in the phono stage. It's not a phono grounding issue, because I checked that. After the preamp is on ~40 minutes, the buzz goes away after I touch the faceplate. So I am acting as a ground. Should I just run a wire from the preamp to a electrical outlet screw, or what? I am at a loss.

TIA,

Lee
licoricepizza
stanwal's avatar
stanwal
3,147 posts
 
Try that first.
jea48
4,425 posts
 
I have a NAD 1155 preamp with a nasty buzz in the phono stage.

It's not a phono grounding issue, because I checked that.
How did you check that?

If you disconnect the TT from the NAD (ics as well as TT ground wire) is the buzz still present?

Should I just run a wire from the preamp to a electrical outlet screw, or what? I am at a loss.
If the NAD has a 2 wire cord and plug I would not advise that. And I do not believe it will make any difference in regard to the buzz.

licoricepizza OP
48 posts
 
The TT does have 2 prong plug. To check if the TT was the offender, I completely disconnected, ground wire and all. the buzz was still there. To this untrained ear, it sounds like a 60Hz buzz, like you'd get from a fluorescent light, or a wall-wart transformer.
jea48
4,425 posts
 
01-29-09: Licoricepizza
The TT does have 2 prong plug.
How about the NAD preamp?

To this untrained ear, it sounds like a 60Hz buzz, like you'd get from a fluorescent light, or a wall-wart transformer.
Is the buzz sound being heard from the speakers?
Or is the sound, a mechanical sound, coming from the preamp itself?
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