What is the Pure Audio? I'm aware of Pure Sound, which is out of England via China.
The Dynavector SUP 200 is made by Dynavector Japan, not Dynavector Australia where the P75 comes from.
As with any stepup transformer, it goes into a mm or 47k load. In your case you would put the P75 into its first setting, -the high output setting. Of course it requires another set of cables. I'm finding out, that however good the phono stage is, if it doesn't overload the gain the stepup is the way to go with a low output cartridge.
Why do you think Vortrex is getting such great results with the A23 stepup and 103?