Jebe1,
The M3B comes with the 6H23eb tubes. They are not cheap and a very good match for long life. I've only read great things about the now discontinued DNA-0.5 and that Richard Vandersteen used McCormack in his system set-ups years ago...Also nice to read that McCormack does mods to his older amps as the DNA-0.5. What amp are you currenty using now?? The DNA-0.5 has been on my list as well. Just wanted to hear more from the Belles owners as well...as read this match is good. I see more older McCormack amps for sale on Audiogone vrs Belles.
Best Regards...