Same story as my line isolator, but this one is more useful. Passive reamp with a Lightning Boy RA66. Sounds good. Another ad hoc kinda build, but hey, it works. Features phase switch and ground lift. Actually goes a bit above unity.
Lightning Boy transformers are handmade in New York by a dude with a lot of studio gear experience. I don't think he likes me very much since I got a new transformer supplier, but I used his MC15 transformers for my D.I. builds for a long time and they're great, I would put them right up there with Jensen and Cinemag for quality.