Phono Preamp. With transformer or fully active

Jensen named the parts of the Zobel Rdamp and Cdamp which clearly tells its purpose. I do not know of any phono stage inputs with those parts intentionally in place.

@intactaudio  Our preamps allow that- if we install the transformers internally (an option) then the output of the SUT is set up so the external loading strip on the preamp is loading the output of the transformer. If the transformer is external, obviously the same is true. So any Zobel or simple loading resistor can be installed with ease. I agree as well that if the aberrant behavior is a peak at 200KHz probably best leaving it alone.

An answer to the question about using a SUT vs. using a MC phono stage.
https://917bd498-4992-4ef6-bebe-3f682d04079f.filesusr.com/ugd/7869ac_7637ddd4ac28491fa20e1396de50696...

This discussion is beyond my pay grade.

I do believe that whatever the transformer it is dependent on the performance of the phono amp it is attached too. I have installed Sowter transformers ( they have several units designed for various cartridge impedance) in several phono amps the last one being an ARC PH 3 SE.
All I can say is that it was an easy job and it worked wonderfully well. For best performance the transformer have to be installed within the phono amp. It is also very cost effective. I have also used Sowter's ESL transformers in my Acoustats with great results.
Having said all this I prefer a fully active design. I am particularly enamored by Channel D's new units. They run in current mode and have battery power supplies that isolate the units from the mains. They are the quietest units on the market and not by a small margin.