MM phono preamplifier

Consider the EAR 834P.  You can get it configured as MM only and it's been around forever.  You could probably pick one up used for cheap and it's quite tubey ;-)

Look for a used NVO tubed phono yes it has both mm & mc but my understanding is the mc just has more gain. I use their 13 tibed unit in mm and find it sonically just super.

IMO the best bang for the buck in an MM-only phono stage is Croft. Glenn offers three tube phono stages. The least expensive model uses SS rectification, the mid tier used a tube rectifier and the most expensive is a 2-box solution w/ segregated power supply. All excellent. I believe the least expensive model lists for right around $1K. Highly recommended.

Leben makes a MM only phono preamp. Most use it with a SUT

https://lebenhifi.com/products/rs30eq.html