Electro-magnetic transformer, nominal output of 28V 250VA. Take out from new equipment- designed to power a 28v 250w aircraft landing light bulb I measured 27.7 volts between 0-28 taps, no load with 121.5V input at the 0-125 taps (see photo #3). Measures 5" x 3-3/4" x 4-1/8" and weighs 10+ lbs.
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