although i have not heard the vandy 5a's. i love thiels 2.3's with my pass labs x-350. you get all the benefits of tubes without the litations. the good thing about the pass is they all have the same sonic signature and musicality from the x-150 upto the x-350. the x-600 are only 15% better sounding than the x-150's.
Certainly worth a home audition.
dave
Certainly worth a home audition.
dave