So I had an opportunity to listen to Audion Black Shadow mono blocks which use the 845 tube. They are SET amps with 25 wpc. They totally outclassed my XA30.5 and I would hope so at $14,000!
I've never heard the Tylers sound this good before. The black shadows basically did everything better except in one area. First off, instruments sounded more realistic. There was more resolution, depth, more separation between the different instruments, and so on....
The only place they started to run out of gas was when I listened to the Gladiator soundtrack, "The Might of Rome," which is a very powerful classical music piece.
They look friggin gorgeous to boot.