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Original Message
Ah-Ha
Posted by Steve O on January 10, 2017 at 16:48:35:
..."So, if you wanted to make a buck transformer out of this by connecting the secondary in series with the primary"
This isn't a conventional circuit for a stand alone bucking transformer. Conventional arrangement places primary directly across the mains and the secondary in series with the load with the combo across the mains.
I too set up a circuit using a tiny 115V - 6.3V/1.5A filament transformer in buck mode supplying 100V/1.5A to a resistive load (150VA or W). Measurements were just as I described previously and the 10VA transformer handled the 150VA load for 1hr w/o issue. i.e. no transformer buzzing and normal operating temp.
Will edit in circuit diagram and meas later.
Test circuit: