Night and day difference. Much quieter, more musical, more tonally accurate, better control and no more mid-bass bloat.
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Do a search on the BAT preamps. I think BAT is one of the first company to jump on this tube. They probably have a lot of discussion on their website about this tube. And of course, compare to the Sovtek 6922/6DJ8s, they sound better. I suspect the redesign has to do with modifying the existing design to use this tube instead of the 6922s.