Here are a few other technical issues.
Don't worry about the load on the cartridge. That is really only for the benefit of the phono section (ask if you need explanation). But you do have to worry about ringing from the transformer itself. If the transformer is designed for particular cartridge, its probably not going to ring if connected to a standard 47K input, unless the manufacturer of the SUT states otherwise.
But if you change the cartridge to one of a different impedance, you may well have to change the load on the output of the SUT to make sure its properly loaded. If loaded too lightly it can ring, which is to say it will make distortion, if loaded too hard (IOW with a load of too low an impedance) it will roll off the highs. 'Critical Damping' is where the load is just right.
Transformers **transform** impedance in both directions so change the load on the output definitely affects the source- and vice versa.
Don't worry about the load on the cartridge. That is really only for the benefit of the phono section (ask if you need explanation). But you do have to worry about ringing from the transformer itself. If the transformer is designed for particular cartridge, its probably not going to ring if connected to a standard 47K input, unless the manufacturer of the SUT states otherwise.
But if you change the cartridge to one of a different impedance, you may well have to change the load on the output of the SUT to make sure its properly loaded. If loaded too lightly it can ring, which is to say it will make distortion, if loaded too hard (IOW with a load of too low an impedance) it will roll off the highs. 'Critical Damping' is where the load is just right.
Transformers **transform** impedance in both directions so change the load on the output definitely affects the source- and vice versa.