Pure tube phono preamp

It's possible to do a MC stage with tubes but I wouldn't. Just finding tubes that are quiet enough is going to be a challenge and nothing guarantees that they will stay quiet.
Step up transformers matched to the cartridge is the way to go. Than buy a really good tubed phono stage. You will have all the magic you need. A lot of us go this route.

BillWojo

What is the bias against using a SUT? If setup properly they are the quietest solution to increasing the gain of a LOMC.
High quality SUT's also have a very high bandwidth so they induce no roll off at either end of the audio spectrum.
Using an all tubed setup for a LOMC just seems like an invitation to frustration as the tubes wear and get noisy. Finding suitable replacement tubes is going to add another level of frustration. I've seen folks complaining about finding good quiet tubes for a MM stage, MC voltages are typically only 10% of that.
To me, using a SUT is a very elegant solution, it doesn't add any components not found in a typical tube system, no solid state components, just simple transformers.

BillWojo