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The only AB comparisons I have done were on power tubes, some from Ron and Cryoset, and some non-cryo with similar test scores. The ones I recall were JJ 6CA7s and Tungsol 6L6Gs. Both tests, the cryo treated tubes sounded a little clearer and quieter, also a bit more dynamic. The others sounded softer, a little fuzzier, not necessarily bad to me, technically not as competent sounding though. I recall preferring the cryo at those times. From memory, it was one of those subtler things that was good enough to prefer, and that can add up when many subtler things together become not subtle.
Also, at some point I got Ron to cryo a bunch of my tubes. He had said folks had had good results with VRs in Decware which got me going, and since I was mailing some, I also sent some NOS inputs. Of those inputs, several individual tubes failed within a short enough time for me to suspect the cyro process had weakened weaknesses in the tubes further. The ones that did not fail consistently had that cryo sound...cleaner resolution.
I ran into issues with Ron's new Power tube Quads also, some tubes worse than others, but over years I had one of a quad fail 4-5 times I guess...odd to me! Ron reluctantly covered it, and the replacements all worked, but he still felt it was my amp and some bias issues, where I suspected it was more cryoing weakening weak connections. This was my speculation anyway.
I have a few audio developer friends who often cryo, wire, connectors, and other amp or DAC parts, and swear by the improvements. Having talked a lot with one of them about subtle sound, I have every reason to completely trust his judgements. But as he often says, if it is not there to begin with, or anything in the chain damages it, is not there to hear, making changes show less, or not at all.
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