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That's the first factory 25 cycle set I've seen. All i'd ever seen 'in person' were conversions with separate power chassis and BIG xfmrs. That was back in the day when Roosevelt, AZ was still 25 cycle from the nearby hydro dam.
Interesting side note - 25 cycle power xfmrs running back-to-back make excellent modulation xfmrs for plate modulation in transmitters. Audio is pretty flat, then rolls off abruptly above 5 khz.
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