Dear @kennyc : " have Koetsu stone and Ortofon SPU carts which reportedly work well with SUTs. "
Do it you a favor and just forget ( for now ) what other reported because the type of higher distortions/fake colors that they like maybe do not like you because your targets could be different.
If what you want is to listen what's in recording then forgeret about SUTs that only degrades the cartridge signal and no matter what can't improve/enehance in any way the cartridge signal.
You can read this M:Fremer full review on this active high gain MM/MC phono stage and take a look with wich cartridges he reviewed along which preamp:
PS Audio Stellar Phono phono preamplifier | Stereophile.com
M.Fremer:
"
I recommend a listen to the Stellar to anyone in the market for a new phono preamp, regardless of price. I don't think I've ever written that before. Like darTZeel's clever engineer Hervé Delétraz, Myers designs using a deft combination of technical knowhow and careful listening, more interested in the sonic outcome than in getting the absolute best measured performance. In my view, that's a winning approach.
Footnote 1: As you can see in the measurements section, JA called the RIAA response "superbly accurate." "
Or you can go for the Phonolinepreamp as Dartzeel or Boulder. Just remember that the quality sound in any LOMC cartridge depends not only of a first rate phono stage but needs to a first rate line stage preamp.
If you can, stay far away from any SUT at any price MUSIC deserves a lot more than just that and you too.
R.