I've used the Herbie's tube dampers on tubes in an Audio Note CD2, Lector CDP 0.6T and a MHdt Paradisea DAC (and an Audio Note pre-amp) and in every application the dampers improved the sound. I can't guarantee that it will do the same for you, but in my experience, using the dampers usually results in a smoother presentation and better bass definition along with better separation and focus and a wider and deeper soundstage. Give them a try. They are a very good value and if for some reason you don't like the results you can always return them for your money back as they are sold with a 90 day no-risk trial.
Herbie's Audio Lab: Tube Dampers
Herbie's Audio Lab: Tube Dampers