I'm considering replacing my passive preamp with a tubes. Is it worth it?

I have a Bent Audio AVC passive and a VAC Phi Beta tube preamp in my rack, along with a high input gain tube amp (VAC) and SS amp (Plinius). The Bent sounds great with both amps but I always go back to the tube preamp for the bigger, more solid sound stage it throws, and the improved low-mids.

That being said, I have heard a Music First Baby Reference passive in this system and that was truly special. It lacked for nothing. Great piece of gear.

@milpai

Sorry for the delay in responding. I just noticed your post. First, I've never owned a Music First, only listened to a friend's in my system. I did not mean to imply that anything was lost in moving from the MF to the Vac. Rather, as I recall, the MF was more similar to the Vac than I expected, and different from the Bent in the same ways the Vac is, as I described above.