can anyone recommend tube amp for dartzeel preamp?

I agree with everyone. I don't think you would be happy unless you get Lamm or current VAC amp.

I too was a solid state guy and now tubes. To me, like vinyl, tubes are away of life(music). Either you do it or you don't! Any half way attempt will just end in disaster("I tried tubes don't see the big deal" kind of talk)! Happy with dart? Stay the course. Looking for something else? Make the move(or another set up). I did. Not looking back! That is the way I see anyway.

Jwm:

The only "current VAC amp" that is point-to-point wired is the Statement 450. I remain skeptical that it is, overall, equal to or better than the Renaissance vintage of amps. It does not appear to be a triode circuit and it is not biased fully Class A. It's also a high-powered design (i.e., loss of transparency and delicacy) that almost certainly uses feedback (disaster), and the output tubes are pentodes. The Kevin Carter-designed Renaissance amps were all-out efforts from the late 90's, when the company was flush with cash from the great economy and its contract to make the Marantz Model 7 /8B /9 reissues. VAC is still a great tube gear manufacturer and it stands behind what it makes, but those days are gone, I'm afraid.

If you want a real tubey, syrupy sound, I'd look into a used Cary V12R. They're 50 watts triode or 100 watts ultralinear. You should be able to pick up the V12R at under $2500. The CAD-120 mKII may also be worth a look, but I have no experience with it. I can't comment on how nice the V12R play with your other gear though.

Don't agree with you. Kevin will tell you his latest amps including the 300.1 sound better than the vintage 300B. The 300.1 does have a triode switch. Class A does not necessarily make it a better amp.