Tube dampers/coolers effect on preamp sound?

" If you hold your speaker cable while the music is playing, do you feel any vibration?"

No, I dont feel any vibration in the cable, but I wonder if Steve (Herbie) is right about vibration on the connectors, especially a RCA on a IC?

Every Herbie's tweek I have used has resulted in a noticeably improved performance. The tube dampers being the most jaw-dropping improvement.

very interesting thread I must say!,learned alot,wanted to say Hi to gammajo,my question is,has any one tried these tweaks on a tubed cd-player like ayon to good effect or bad?,the cd 2s or 5s players.

Audiolabyrinth, I use herbie's dampers on a Jolida cd with 12AX7s. Result was more focused image, tighter bass. But again, the placement of the damper is important; for me it is near the top of the tube, level with the top of the plates.

Herbies top of the line better bass quieter etc.

I found this article in Stereophile about Audio Research tube dampers? I've tried to locate a seller online, but haven't had any luck. The AR website isn't very helpful.

Anyone know where to find these or have any experience with them?

http://www.stereophile.com/content/audio-research-reference-phono-preamplifier-audio-research-tube-damping-rings