Any tube DACs with tight bass?

From a number of reviews of tubed DAC's, a common theme seems to be that the bass can be soft/loose/ripe/etc. I realize that one is unlikely to find Krell/Levinson/Wadia bass from such designs, but which tube DAC's give well-defined bass as well as rich, full mids? (I'm not worried about "rolled-off" highs... this is usually welcome on most CD's).