SUTs are very cartridge specific. The Shindo's are designed for the the SPU type cartridges and I felt like I had too much gain for the Dynavector. I had the same very low volume hum you describe with the internal VR's SUT, but none at all with the A23.
I just switched to the Teatro and have ordered a Bob's Sky 20. The Giscours works really well with the Teatro and Bob's 1131 at 1:20 but Bob said the Sky 1:20 uses the whole transformer rather than half of it. I'm looking forward to trying it. I also have a Lyra Etna and use a Lyra Erodion SUT with it. The Etna does not sound as good with the Bob's at 1:20. For it, he recommends the Sky 1:30.
While the VR's internal transformer worked ok with my Dynavector, I learned it was not the optimum choice and was never meant to be. The T1 would not be either for that matter.
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