What is the theory, or greater breadth of physics about toroid transformers? When did they come about, and what was the logic in replacing “C” or “E” frames (for non-RF applications). I had an old Uti-Com Communications radio that used a toroid switcher, and many other aspects of the radio were of quite modern design for its time frame. It even used a strip-line of 6360’s as buffer/multipliers, one as the driver, and two as the final. I saw a transformer design once for an “intrinsically safe” isolator for “DC ” analog lines, and the toroids used in this “phased switcher/rectifier” were covered with ferrite covers. I also seem to remember that design in the Western Electric 247B tone decoder.
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