I have a 300X. It was originally a Supertube version, which I just had BAT change to the 6922 version. I prefer the 6922 sound, especially with Telefunkens, which Steve Bedarski of BAT suggested, to the Supertube sound; I even preferred the stock Sovtek 6922 sound to the Supertube sound. Everything else in my system remained the same when I made this change. I found the 6922 version to have that "wetness" you mentioned and a warmth, especially with the midrange, that the Supertubes did not have. The bass doesn't sound noticeably different between the two versions, and my speakers (Fulton Premiers) go down to 20hz. Other Audiogon commentators about the two versions were, I think, unanimous that the 6922 version is "better" than the Supertube version--if one wants more of the classic warm tube sound. Despite the cost, I'm glad I had BAT make the change, and I am highly satisfied with the 6922 version.
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