Join Date: Oct 2002
Location: Pompton Lakes, NJ
Re: Tube Amp bussy hiss
A) Bring the amp back, and get a replacement.
B) Tighten up any visible screws...
Note specific? Sympathetic vibration... It's like when your at band practice, and your bass player plays a B, and your drummer's snare vibrates from it, but not from an E, which is lower and bassier.
One more thing, i had a similar problem with my amp... Peavey 5150... Turns out, i added to much bass to the mix, and it was causing the speaker cable's screw on plug cover to vibrate loose from the plug making a similar sound to what you described. But since your at low volume, it shouldn't matter.
Other than that, there's no solution... asumming of course you've plugged into other amps to ensure it's not the guitar.