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Just got back from the DC Audiofest.  Hangin' with Jack Woo, his cousin Simon and two other guys.  The show ended at 5pm, so as I was leaving to come one, (I live close to the show site), Jack took this tube out of another amp and asked if I wanted it.  USAF 596.  He is said they were old, rare and he only had a few.  He said when they were gone, they're gone.  So i took it.  Just plugged it into my WA6-SE and it sounds fantastic.  Not better or worse then the Sophia Princess it replaced.............just different, but in a very good way.New tube for the WA-6 SE from Jack Woo, USAF 596.JPGSo I will continue to use it and leave the Sophia Princess as a backup.