Best isolation device


I am currently running a tube pre and solid state amp. I am trying to decide on a set of feet to set them on. The problem is that I have a glass and steel belo rack. Wife. I am not sure I will have enough clearance for a platform as well the cones. I have considered black diamond and mapleshade. I just want something that will work on glass. Thanks for the help.
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I fear that the glass shelves should be adressed first.Any chance of getting custom wood shelves made to fit the rack?
Having said that,I prefer brass feet-Star Sound,Mapleshade,Walker and assorted machinists here at AudioGon.
I agree that those glass shelves must go!!! Glass sounds awful due to significant resonance glare issues; same problem with those glass front doors on equipment racks.
As anticipated, the glass shelves have turned the stomachs and raised the hairs of my fellow agonr's. Should I threaten my wife with divorce? Without the shelves, what is best? Thanks for the great input.
Vibrapods and Vibracones work great with glass shelves. Go to Vibrapod.com and check out the Vibrapod sandwich.