Valvet A3.5 Block with Merlin VSM ?

So, you've concluded that tube amps only sound good with NOS tubes? My VAC amps and pre sound great with new production tubes. If you like your current amp, find a good dealer that can properly test and match tubes for you and keep experimenting with new production. You may be pleasantly surprised.

If you really want SS, call Bobby at Merlin. He can steer you in the right direction.

When I last owned a EL34 based amp, the SED's were also my favorite. I've also heard good things about the Treasure tubes. Jim McShane is an excellent resource and all the tubes I have purchased through him have been very good and very durable, which goes to the importance of proper testing. To the OP, you can find Jim's contact info over at Audio Asylum. Good luck.