How to choose step up transformers?

While a generic SUT covers a broad range of MC carts (2-40 ohms), a purpose built SUT from EMIA and Bob Services will definitely sound better with the cart it was originally spec for. That’s how one ends up with multiple SUT’s. When it comes to Analog, you want to extract every last ounce of goodness from that cart and vinyl.

Glad to see roberjerman loves his vinyl cause he pretty much trashes everything else here :-)

Check out this thread as well,

https://forum.audiogon.com/discussions/tango-step-up-transformers-vs-bob-s-sky-blue-cinemag

@lalitk : Yes, I am critical of most of the claims made for today's Hi End gear! But I am content to live with and use some of the best tube and SS gear of the pre- '90 eras! Three roomfulls, in fact! Plus many TTs and boxes of LPs. And not to forget the three RTR's and boxes of RTR tapes!

I have been using Grado MI's and various MC cartridges since 1976 - so I certainly have experience to draw upon!

Not sure if using a low-end MC is worth all the connections and lossy wiring over a good MM. Especially in your setup. Compare an Audio Technica VM760 with the MC configuration. 

I agree with the Audio Technica VM760 - that is one fantastic cartridge!