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Field-coil speakers
Terry,
That is a very nice Halli. The field coil speaker is a hangover from the early radio days, but is quite uncommon to find in post war TV's. It is as you probably know useful in the B+ supply to double duty as a filter choke. Hallicrafters seemed to like to put B+ chokes in their TV's. My T-54 has a real choke transformer, even though what it should have gotten was a real power transformer!
I have a 1947 Admiral wooden consolette with the 30A13 chassis that uses a field-coil speaker. My Pilot TV-37 also uses one.
Rob
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