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Air Core H.O.T.
I think the reason for the early air core H.O.T.'s is that the insulating materials were not developed enough to use iron core H.O.T.'s. The static sets and early lower high voltage CRT's were able to use iron cores simply because the HV was lower and they could insulate them from arching. When they went to larger CRT's requiring higher high voltage the iron core transformers would arch to the core. Even though using air core transformers made it more difficult to create the required HV it also made arching less likely. That's just my guess, may be completely wrong. Thanks guys!
Dennis
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