Yes, my pre-amp/phono pre are custom built in an industrial (non-audiophile) box. The builder used soft spiked feet. It resulted in vocals having a covered sound, light a blanket. I already owned two of his pre-amp only units in 2000 and his phono stage. Those chassis were audio build type. So, I tried everything from Magico Qpods (the worst, dark, slow and muddy) to Isoblocks, to original and Ultra mini Stillpoints. Ginkgo, Herbies, Isoacoustics, tungsten carbon balls, etc. I stuck with the Ultra SS as the best for that unit through the years. That pre-amp sounds better than an EAR 912 which is saying a lot for something handbuilt back in 2000. It uses 6 subminiature tubes in the pre-amp and 8 in the phono stage. All voltage regulated.