Fast forward 5 years. Vacuum tubes definitely don't last forever. Modern tubes really don't last very long at all when compared to the good old vintage tubes, but even those awesome old school tubes don't last forever. Biggest problem is the dwindling world-wide supply of quality NOS vacuum tubes. With my tube tester I'm able to see if a tube has been used via the "life test." Typically, after about 1 year of regular use a tube will show signs of usage or in the case of modern tubes it could be on its way out. I tested the cryo-treated tubes from 5 years earlier, which had seen daily use (30-40hrs per week) for that 5 year period. One would expect the tubes to show some signs of usage on the tester, but the cryo-treated tubes actually tested the same as brand new tubes.
Fast forward to today. I have finally decided its worth cryo-treating ALL tubes used by Lightning Boy Audio. This week I'm sending out the first batch of Lightning Boy tested and approved premium NOS vacuum tubes for cryogenic processing. All equipment manufactured by Lightning Boy Audio will not only feature NOS vacuum tubes, but those tubes will also be cryo-treated to ensure they last the rest of your life.