The Audio Research clear tube damper rings have worked well in several units I have tried them in and are inexpensive.They seem to add greater clarity overall with better bass slam and texture.Results may vary with different components. I use them in my ARC gear with good results. I tried them in some Dynaco gear and the results were dramatic. They took a PAS pre amp and a ST 70 to a new level. This may be that the circuit boards are so flimsy in those units and they really need help in this area. Look for them at the Audio Research web site under retail price list, then go to the price listing for tubes. You can spend alot more,and I have not tried the ones you mentioned but if these don't do what you are looking for you are not out much green stuff. They seem to sell very quickly any time I have seen them listed here.
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?