Dave, I purchased this same tube from Cryoset several years ago (they did not have a "super-cyro" at that time). IMHO I did not hear any difference between a non-cyro or cyroed 6H23 Rocket Logo tube (both tube pairs purchased from Cryoset). They have more than doubled the price with the new "super-cyro" designation. I do believe in the cryo process, it should increase the life span of the tube but I have not found that it improves the sound of a tube or silver wire.
I have also experimented with identical cyroed and non-cyroed silver interconnects, and again IMHO did not hear any difference in the wire or enough difference to justify the additional cost. The only area where I have found that I could actually hear an improvement was in interconnects with better quality RCA connectors, usually the lower mass of the connector the better the cable sounded.
