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 ?
rmcfee
I use Herbie's Tube Dampers on all of my tube gear. I wouldn't say it's a profound difference, but well worth the asking price. It's a pretty cheap tweek that works well...IMHO.
I also use Herbie's Tube Dampers in my preamp (4 tubes) and the result was a tighter bass.