Thanks guys,
I figured that it was "tube microphonics" but didn't know how to go about solving the problem short of buying new tubes. btw, found a site for HAL-O Vacuum Tube Dampers and was wondering if any of you have used these (or other brands for that matter) and what your thoughs are about these products in solving "tube microphonics". Guess damping my tubes might be my first "tweak".
I figured that it was "tube microphonics" but didn't know how to go about solving the problem short of buying new tubes. btw, found a site for HAL-O Vacuum Tube Dampers and was wondering if any of you have used these (or other brands for that matter) and what your thoughs are about these products in solving "tube microphonics". Guess damping my tubes might be my first "tweak".