In terms of impedance matching, a passive will in most cases work better with tube amps, they are simply easier loads to drive. What is the input sensitivty of you amps? What is the output volatage of the DAC? In all likelyhood, it will be a very good match.
Can I use my passive preamp with tube amps?
I have been thinking about making the switch to some tube monos but I use a passive preamp (Bel Canto DAC3). I was wondering if a passive preamp works in the some way with tubes than solidstate. I have comared using a preamp with my current set up and I prefer the sound with the passive preamp. Thanks