Tubes for VTL S200

I know it’s subjective and circuit dependent, but I really like the Tung Sol 6550s in triode in my Dyna/VTA monoblocks with an EH 12BH7a driver tube.  It’s the Goldilocks combo for me.  I’ve liked EH-EL34s, Siemens SL-34, GL KT66, and really liked the Tung Sol 7581A too, but those TS 6550 make me smile.  The EH6550 didn’t do much for me.

Have owned quite a few of the VTL monoblocks but not the S200. The EH6550s are nice, so are the EH KT88s. You may want to consider adding a 0.1uf film cap bypass to each of the main filter caps. Will remove a ton of the noise that gets modulated through on the B+ rail. 

Don't forget the 12AT7 input tubes and 12BH7s. Try to find RCA or Sylvania black plates to plug into those sockets.