If @coco can’t work it out/explain it what chance have us mere mortals got.
Just re-opening this old discussion on IO1 and SUT’s. I still have the same setup with the same cure for noise which continues to work. However considering trying something different but low cost. Has anyone tried or know more about the Stevens and Billington transformers Emporium sell. The 120:1 60:1 copper one on eBay looks a reasonable deal hence asking.