[Milsurplus] power supply question

[KD7JYK DM09]

> Off hand, you'd think so. as generally they rectify the AC line to make
> DC, but is there something that ties them to strictly 60 Hz?

Inductors, capacitors, transformers...  All selected to operate at 60 
Hz, and to switch from a certain frequency, at a certain frequency, 10, 
20, 30, 125 kHz, et cetera, and then rectified, filtered, et cetera, to 
end up with DC.

Kurt