Best isolation device for a tube pre-amp

I have used black diamond racing cones MKIII with very good effect ,tighteng up the low end more focus else where,then as my system was upgraded in several areas I found an unnatural hardening in the sound in that set up.Now I am using a $3, 12" bicycle tube with a corion shelf on top, best results with pre on it's original feet.This works well for tube pre but the best yet is SOLID TECH'S SILENT FEET under the CD player (could be used for pre as well but with diminishing cost/effect returns),look for major increases (all good)with this set up .oh ya all this is best on a cement foor.

tried the bicycle innertube sandwich that soundstage.com raved about and it was TERRIBLE. bass was slow & muddy.

everything improved substantially when i put hard cones under the pre which sits on an MDF shelf on a rack. look at blackdiamondracing and TG audio for starts and use a weight on top the pre as well...that ought to isolate it very well w/ no adverse effects.
rhyno

I agree with Rhyno on this one, as I use Nordost Pulsar Points under with lead weights on top of the pre. All on a 1.5" MDF shelf; increased width, hieght, depth, brought things into focus; but most importantly increased micro and macro dynamics, which brought the performance to "life"; helped me connect more. Increasing the PRAT and boogie factor helped me connect more as well. I haven't heard the titanium versions, but the aluminum PP's worked wonders. PP's and MDF are great combo. Tg Audio's cones (also aluminum) I bet would work well also. Perhaps with the points up if mass loaded?

Use a good,solid stand.For tubes get Black Diamond Racing Cones #4's For S.S. try the #3'sI tried Vibra-Pods,stock feet and J.A.Mitchell cones.The best by far were the B.D.R. cones.They opened up the soundstage,deepened and tightened bass and just sounded nicer overall.You can pick up 3 here on AudiogoN for $45 used.. $60 new.....dave99

An empty box Of Montecrosto #4 works well.Put the cigars in the Humidor and fill the box with silica sand.Place it on top of the pre amp.Works great.