New, or is Used an Option?
I started this here for a friend: Tube Preamp with MM and MC. Perhaps something mentioned, or will help you find something, or clarify your thinking.
Many Preamps that have MC, like my Luxman SQ-N150, have a single fixed impedance and gain, most often I see 100 ohm. That's limiting, but ok for my office. Main system: that's not enough. Most will advise a separate Phono Stage, my friend's quest is for a Preamp with MC options built-in.

