Who is using their DAC as a preamp?

I am using my TEAC NT-505 DAC as a pre-amp in front of two CARY 805AE mono amps. I am very happy with it. It replaced a Modwright SWL 9.0 tube pre-amp, which is no slouch pre-amp. I moved the Modwright to my other system which is all SS. A better fit to soften the SS sound with a but of tube sound. But the TEAC does great as a pre-amp. And you can configure it to by-pass the preamp/volume option to use it as a straight DAC with another pre-amp if you choose.

Using my dCS DeBussy, sold the preamp and when the Bartok arrives, it'll be hooked up to my amp. Bye bye preamp.

I use my Altair DAC/Streamer and it is my pre-amp too. It is fine.
It is nice.

I've done it for years, started with my Theta DS Pre in the early 1990s, and doing it now with the Cambridge Audio Edge NQ (which also styles  itself a DAC/preamp).  I've never bought the claims that introducing a preamp improves the sound, unless it provides better impedance matching, which is unlikely, or eliminates design problems such as distortion in the gain phase.  I've tried a variety of preamps and the only real difference I noticed was an increased noise floor (that was with a Spectral preamp, not a tube unit, interestingly enough) and some tube bloat.

I use a Wadia 321 DAC and a RP-1 as a pre/phono stage. The RP-1 doesn’t have balanced capability but the Wadia and my amp do. I put the RP-1 in line for the phono stage, which was rated good, and so I could roll some tubes and hopefully warm things up as I my amp is class D. I proly been running the RP-1 and using streaming sources 80% of the time for nearly a year. Just the other day I pulled the RP-1 out of the system and went back to balanced connections from the Wadia to the amp as I been streaming a bunch. I like having both capabilities but wished I could afford an RP-5 with balanced.