400hz is great stuff "for where it is." Much much lighter transformers than 60Hz. "When I was a kid" there were outfits selling WWII military surplus stuff. The catalogs did not necessarily TELL you that these were 400hz, and not useable on 60hz power
My Gramps had bought a Crocker Wheeler top training turret "for the motors." On that thing the motors were 28VDC. Only thing 120V on the thing was the box that controlled the suit heater, which was a great big rheostat control. He never used any of it, and it sat in a couple different places, "us kids" shooting down thousands of Japs and Germans. Later Dad sold it to one of the warbird people who came through Spokane
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