How to choose step up transformers?

i agree with @lalitk .........if you are a DIY kinda person who gets techie stuff.

if you really want to do it right and are not techie, contact Dave Slagle directly and ask him to recommend which of his SUT’s is right for your cartridge and phono stage.

http://www.myemia.com/SUT.html

in my case, he sent me two to try, then two more, and i’m really happy with the results. i now own 2 of Dave’s SUT’s.

i wish i was smart enough to figure it out on my own, but i could not quite get a handle on it myself even after reading a bunch of stuff. if that is you too, don’t let that push you away from SUT heaven.

Thanks for the reply.  It seems I need to first pick the cartridge then buy the SUT.  But if I change the cartridge, I may need to buy another SUT?

The good news is that SUT matching is not that critical! So if you change your mc cartridge you will still have very good-to- excellent sound quality - just with a different sonic "flavor". That was what the late - and missed! - Art Dudley concluded after years of listening. He mentioned this in one of his many columns!

I own five SUTs, including a Mike Sanders Quicksilver - and numerous mc cartridges. Why? For the different sonic "flavors" with different combinations of cartridges and SUTs. 

And for something "different" I also have a Marcof PPA-1 battery-powered SS head amp. This too sounds excellent!