What would cause noise (ground noise?) when touching the volume control and tone controls?


I have a new preamp that I recently hooked up and I'm getting some interference or what may be ground noise but I only hear it when I'm physically touching the metal volume knob and tone controls.  When I touch the metal top of the case in addition to the knobs, the noise will subside.  Just looking for ideas to help isolate the cause.  I think the case itself just isn't grounded sufficiently.

I have tried new power cables, RCA cables and plugging into different outlets with no change.

tubeguy76

@daveyf I'm going to not mention the manufacturer right now until I get a chance to speak with them about it.  I don't want to cause any issues for them in case the issue is really mine and not theirs.

I did try the cheater plug to remove the ground and the noise was still there so I'm thinking a tube or maybe a bad transformer?  We'll see, I'll update the thread as soon as I can.  :)

I fixed it.  The left channel output ground wire had fallen out of its terminal block.  It's quiet now.  :)

Use a power conditioner plugged into one outlet.

And then buy a new dog