Looking for a tube DAC.

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.

Another vote for the Audio Aero Prima DAC here! Sounds great, nicely balanced throughout the audible range, great bass and treble extension. All this is thru a Denon DVD2200 used as transport.