I am using the Ceraballs under my ARC VT100 MKII with excellent results. Improvements in clarity, focus and bass definition were not subtle. Also, the soundstage opened up considerably.
Isolation for tube amps
I've read the some of the threads on isolation platform ideas for amps, but am wondering how one can isolate the amps (and other equipment) from ambient sound pressure? It seems that this would be the most predominant force to isolate? I don't know how anyone would be able to isolate one's components from this force unless the components were in the other room. Any ideas?