heres an odd one

[Chuck H]

So the actual vibration-to-electricity gets made larger because the amplitude of the mechanical vibrations is multiplied hundreds of times by the resonance. Even a little damping cuts that down a lot.

Using the BLUE rtv gasket goop. Not the black.

Actually... Even some commercial caulk tube silicone products are said to be conductive. Silicone II (2) is not. And it's good temperatures well above anything in a tube amp. It's a little more expensive than plain ol' silicone, but a caulk tube of the stuff lasts just fine if you seal up the opening some how. I never even get to use a whole tube on my electronics projects because something like a leaky tub or a sink installation always comes up before I do.