which is better ? MC phono stage or MM+step-up ?

This is a very interesting thread. My situation was that a well-regarded, but still relatively modestly priced phono stage with a JFET had been heavily modded. Even then, that left a modestly priced JFET still in the mix. The EAR MC-4 is a flexible, well-built and well-regarded unit. It is is nice complement to my modded phono stage run in MM mode. And yes, it is not purely about gain. I swapped 20 db of JFET for 20 db of SUT.

The use of JFETs + tube or pure tube or SUT + tube, etc. in a well-designed, top-of-the-heap unit, such as CJ, Atma-Sphere, Einstein, Aesthetix, etc. becomes a matter of design and listening preferences.

I like the previous comment that there are many roads to Rome.

Dertonarm, IME LOMCs have a lot of current. So much that if you short them out completely, the sound from the phono section will only be a few db down (and rolled off on top). Most audiophiles don't seem to realize that in exchange for low output voltage you get high current.

If there is any advantage to using an SUT, it is this fact, although a direct-coupled input stage can take advantage of this as well. I suspect that 20 years from now this will still be a debate, and still largely be dependent on the topology of the phono section.

:-)

Ralph, your statement on lomc voltage and current is profound. Indeed it is the very essence of how SUTs work.
If only I knew more about the basic concepts of current,voltage,impedance,capacitance and the laws that govern them.Having no background in electronics other than it can kill you I am somewhat in the dark. Having built a SUT I am experiencing the results and consequences of those laws.
This is giving me a taste of the concept of matching and summitry.I really would like to learn more.Keep up the good posts.

To anyone: My SUT default load is 200ohms.Can I load it even lower? It seems to be working very well with my lomc (a Benz Gold)but sometimes vocals seem very slightly strident. When words end in S,it some times sounds like snakes.This is not consistent.
One other thing I am experiencing:If I have a non-shielded interconnect plugged into the preamp I get hum.If I unplug the interconnect the hum is gone.Any suggestions?

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Emorrisiv, sounds like you have a grounding problem. Make sure the arm ground, transformer ground and cable shields are all good. You can tie the arm ground to the SUT ground at the SUT's input and that should be consistent with the ground at the output of the SUT.

There could be a loading issue, but I would not mess with it until you have the hum problem fixed! If the ground is not right there could be ringing in the cable (anyone how has worked with oscilloscope probes knows what I am talking about); IOW the hum and the sibilance could be related.