The cabinet I have it on is quite susceptible to vibration, especially since the speakers are right next to it.
I went to googling for solutions, and read many.
Using a partially deflated wheelbarrow inner tube made as much sense as about anything else I saw out there.
But instead of placing the preamp on gold plated Rhodium ball bearings balanced on slices of the Glockman diamond, why not just decouple the board from the chassis by removing the screws and standoffs, and resting the board on a simple layer of fiberglass insulation?
It's not like you pick up the preamp and shake it every time you turn it on, right?