Maril555,
I have my Cortese setting on a rack that is similar to the Mapleshade racks (Rock Maple shelves). The preamp is supported by Mapleshade brass cones. I think the best isolation would be Silent Running Audio isolation bases. These are custom made to the exact size of your equipment and they take into account the weight and weight distribution of the piece of equipment they are supporting.
I have my Cortese setting on a rack that is similar to the Mapleshade racks (Rock Maple shelves). The preamp is supported by Mapleshade brass cones. I think the best isolation would be Silent Running Audio isolation bases. These are custom made to the exact size of your equipment and they take into account the weight and weight distribution of the piece of equipment they are supporting.