Thoughts on vibration elimination...

A couple of months back I was experienceing a rather nasty vibration situation in my room which involved my turntable, a wall mount stand, and, I think, my subwoofer system. The problem was reasonably effectively addressed by constructing a floor mounted stand from MDF, PVC plumbing fittings, and tennis balls.

I'm wondering if it wouldn't be a half bad idea to try and isolate my power amps as well, since they are presently sitting on the floor and they have tubes in them. My question is: Do vibration dampening materials tend to be component specific, or environment specific? In other words, because of the size of the room (15' x 14'), and the nature of the construction (basement, concrete floor with, studs and drywall on the walls), will the MDF/PVC/tennis ball contraption work yet again, or do power amps require a different solution based on the nature of their construction/operation.

Any help or opinions greatly appreciated!