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Paolo C. Was using a PSVane we 6sl7 before, it does sound great but I think the electrical parameters where a bit off from standard 6sl7 overdriving my amp a bit, with the cryotone I get the same resolution and musicality (if not bettter) while the amp also seem to sound fuller as I can rise the volume a bit and driver the rest of the tubes better. At least this is my hypotesis for switching to the cryotone, excellent tube for a type that is otherwise hard to find of good quality.