Isoacoustic puck mini's or orea bronze for 12 pound tube preamp

When I tried the Oreas under my SACD player directly in contact with the base (bypassing the actual feet), it was a study in frustration. With one setting, I'd get fabulous mids but severely rolled off highs. Moving them 1/4" at a time completely changed the perspective. 

Going from 3 to 4 Oreas didn't help much either as there were always tradeoffs and compromises. What worked best (by the largest of margins) was to put the Oreas directly under the footers of the SACD player, which both Isoacoustics and MusicDirect recommended not to do for best results. Go figure.

With the mini pucks, try them right under the feet of your CD player and you may be surprised by the results. 

All the best,
Nonoise

I'd go on Amazon and order Sorbothane pucks, donuts, squares, whatever you need from there. You can get what you need for probably $20. Sorbothane is a very good, fairly generic, and widely available isolation material used for all kinds of vibration control from HVAC equipment to laundry machines, and yes, HiFi. There's no reason to pay silly markups for 'audiophile' versions. 

This might be even better: StackAudio AUVA Equipment Isolators.

More money but perhaps better sound etc.

https://stackaudio.co.uk/product/auva-equipment-isolator/?v=0b3b97fa6688