Steve, I'm using iso-cups for my tube preamp. I know you recommend iso-cups for mostly amplifier and tender feet as universal recommendation for rest of the components. I thought my preamp has tubes in it, so the iso-cups would be a good choice. Do you think I should try tenderfeet instead underneath my tube pre? Also, my tube pre is sitting in a hardwood shelf. Do you think, placing my tube pre on a butcher block and then using grungbuster dots between my rack and butcher block, would help?
Also, my amp - modwright KWA100SE has some nice spikes and brass footers integrated. Do you think, using tenderfeet should be an improvement? Btw, I'm going to place them on a maple butcherblock on my hardwood floor and use extra thick grungebuster dots between butcherblock and floor.
Lastly, My speakers are Daedalus Ulysses. It comes with maple base with soundocity outriggers (nice spikes with footers). Is there any isolation you'd recommend for my speaker setup that can be used with the soundocity outriggers and maple base to improve the sound?