Not only is Steve a great guy, he gives you 90 DAYS! to be sure you like the product! I have three sets of them on my tubes. two on my Siemens E88CC on the preamp, two on my CCa on the amp, & two on my 6CG7 input tubes! Things get tight and crystal clear. Stick them on and leave them alone for a few days. Then pull them off. I'll bet you'll miss them a LOT soon as you fire it back up w/o them.
