Tube dampers/coolers effect on preamp sound?

Has anyone heard a change in sound, good or bad, when using any kind of device that damps a tubes glass bottle in a preamp ?

rmcfee02-27-2013 3:55pm

gammajo Details Discussions Posts This discussion Message User 844 posts 03-01-2013 at 08:38am Copy Comment URL Report Comment Edit Delete I did not like the effect with my Audio Horizons Preamp (lost openness and aliveness) though it did stop microphonics