I tend to agree with Upscale on this. I use Top Hats and find them to be excellent on the principal tubes in my preamp, DACs and amps, but I note that along with better focus their effect can also be to rob a little of the euphonic sonic "glow" of some tubes which you may like. The ARC dampers are pretty cheap, I'd suggest them as a good place to start.
recommendations for tube dampers???
I have found a combination of components that I think I can live with for a while. So now I'm starting to think about tweaks. I was hoping to get some feedback on various tube dampers that you have tried. The ones on http://www.vintagetubeservices.com/ look interesting, but many things do. Top hats, tube sox, pearl coolers, etc??? Anything you would recommend?