I have used both of these, being a dealer for both. I think you are confused about the nature of the 75 as you are calling it a step up transformer. A SUT is used in front of a phono stage for very low output cartridges. For example, I have used a Bob's Devices SUT with the 75. I assume you are running the 75 into an AUX input on the C-28 and not the phono input, if you are do not do so. There are several things you can do, I am not a fan of Mac of this vintage so I would change that.You can get a Passive pre amp which would work with many amps, you can get a better line stage and keep the 75 or replace it with the Consonance. If I had a chance to get the Consonance at a good price I would get it and sell the Mac. I would keep the 75 for a while and compare it to the JRs built in phono stage. If the built in one was better or equal I would sell the 75, if the 75 was better [I suspect it will be] I would use it and use the JR as a line stage. Or you could get an entirely different line stage. In any case removing the Mac will improve your sound.
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