That power supply is different than normal transformer power supplies, which is why it is a magnetic field amplifier. The duty cycle of the current going into the transformer (actually a field coil) is adjusted by a triac, which gets feedback from the voltage rails. When the voltage starts to sag on the high rails, the duty cycle is adjusted upward (but never to 100%). The power is never flowing into the field coil during the zero crossing of the A/C cycle.
It should sound like it isn't there!
There is a difference between hearing and listening...
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