Dear @lewm : All SUT's have more or less the same " problems " and all degrades de cartridge signal including the EMIA because all needs those additional IC cables, input/output connectors, solder joints and the like.
Your Supex cartridge in those old time was designed by today MSL Matshudira.
@dogberry active high gain phono stages/phonolinepreamps have a price tag range from 3K to 90K+ ..That's is a wide price range for you or any one else. Btw, our ears are the worst tool to make precise comparisons, that " your ears will tell you " is full of subjective with no objective single parameters it's only: " I like it " and that's all.
First you have to have the best cartridge signal reproduction you can and the you will listen it and to achieve that " best " signal reproduction you need objectivity a bout and common sense if not then you have the " I like it ".
Many of us are in the analog/digital audio world because we truly love MUSIC and achieving the best reproduction not only gives us a very high MUSIC enjoyment but a lot of added fun. In the other side there are the gentlemans that mainly does not cares of quality reproduction of MUSIC but mainly only just for fun even if that you ask to them they will tell you that are " music lovers ".
R.