Tube dampener questions


I bought some tube dampeners and on when I put them on the tubes on the amp and DAC it seemed to suck the life out of the sound so I removed them.

Doing some tube rolling and while the new tubes sounded good the vocals were disconnected somehow.  They seemed to distort during dynamics so I put a dampener on the input tube and it seemed to help at the cost of a little bit of life.

What is the correct way to use tube dampeners?
As vibration control are they like a guitar string and where they rest on the tube changes the frequency of the vibration?

Several burns later I think I got it right but I'm sure someone out there knows how to do this correctly.
128x128danager
Agree with the others. I find all forms of damping to um, damp the music. 
Brian - The Croft of mine does not benefit, el cheapo  chassis..and all…

but i tried

It benefits from an HRS damper tho….. greatly
and Stillpoints.
I've tried several types also,but only had good results once with some 12AU7 tubes in a pre amp with Herbies. Much better results to be had with footers and platforms under tubed equipment.
also tubes like Tele that you cast aside as thin……well, maybe listen again…..
When you say "new tubes sounded good..."
why not give them a few hundred hours to break in,
before you start evaluating dampers seriously?