Looking for a tube DAC.

The Hermes II is an excellent DAC especially when teamed with Telefunken Falcon tubes. Better though is the Chord DAC 64. No tubes but high end is not rolled off like a tube DAC. It also has buffers to tweak the sound to your liking. Runs hot!
I find the best place for tubes in a system is the preamp but that is another debate.

I'll echo the thumbs up on the Hermes II. I've got Siemens CCA's in mine and it sounds great.

You should check out the Audio Logic. There have been quite a few threads on this outstanding dac.

For a more "tube" and beautiful sound, the pricier Audio Notes, the Audio Aero and older Audio Logics are good choices; the newer versions of the Audio Logic are my choice, but you lose a little bass warmth in them compared with the older versions, so I wouldn't call them "tubey"-sounding, if that's what you're looking for.

I second the Audio Note recommendation.