If your preamp is a tube unit, it could be that you have a microphonic tube in the circuit, resulting in what you describe. If ss...not applicable.
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.
Showing 3 responses by daveyf
@tubeguy76 Might want to experiment with swapping tubes around. See if that does away with the issue. I had this exact problem with my tube preamp, and with some tube swapping was able to zero in on the offending tube. Sometimes tapping on the tube will show an issue, but not always. |
@tubeguy76 Since you confirmed that your preamp is a tube preamp, it would be instructive to know what make and model and also the tube compliment that it uses. While a grounding problem is likely, my suggestion about a tube issue is also possible. IMHO,It is a little crazy in this day and age that manufacturer's still have problems with grounding issues! |