What SUT for Ortofon Cadenza Black and Simaudio 891 Preamp

Viridian, I don’t doubt what you say as regards liking a 1:18 SUT more than a 1:10 SUT, but there are many other possible reasons for the sonic differences besides the fact that the respective turns ratios result in a difference in cartridge loading. For one thing, when you use a higher turns ratio, that affects the capacitance (due to the cable between the SUT and the phono stage plus the input C of the phono stage) seen by the cartridge by a factor equal to the square of the turns ratio, so maybe somehow the big increase in capacitance with the 1:18 SUT works in your favor in your system. Or maybe it is only that your 1:18 SUT is superior in other ways to your 1:10 SUT.  In fact, the difference in the load on the cartridge between the two would be way down my list of explanations, but maybe you have data not mentioned.

@fundsgon I went through this a couple of years ago. Just an FYI, don't assume a SUT is a SUT. Some have much wider bandwidth than others. 

You may want to consider something like the Technics 305 SUT. 

If you were nearby have several SUTs that I have bought over the years. 

I find this discussion increasingly of interest, particularly the exchanges between viridian and lewm.  In the end the use of an SUT, like everything else is very subjective.  Like lewm, I favor low ratios, 10:1 and 5:1 are typical.  Please note viridian's preference for higher ratios.  There is no right or wrong here, just difference.  I too like Bob's Devices and use a SKY 10 often.  I also use a Consolidated 10:1 quite a lot.  Like lewm, I also try cartridges with and without an SUT.  Most often I seem to like the sound with an SUT better, but not always.  There is no generally accepted practice in my madness, but I have fun.  For others seeking guidance, I believe this diversity is enlightening.