I've seen on the internet several tube dealers promoting cyro treated tubes. Anyone have any experience with them? Is the sound or durability any different? I have a Jolida 502p that I will be purchasing a back up set of tubes for and found the cyro idea interesting.
Cryogenic International in Scottsdale, AZ can tell you all about this process; Charles does it for many tube dealers and manufacturers. It improves the gas molecular structure and lowers the noise in them.
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