Quote:
Originally Posted by Tom Bavis
25 cycle transformer will work fine on 60 Hz - probably won't even get warm... there's twice the iron needed for 60 Hz.
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One could run a 25Hz 120V primary transformer on 240V 60Hz and still not get warm. However, all the secondaries will produce twice their rated voltages. Which might be an issue for the high voltage secondary, as the insulation might not be up to it. Obviously, we'd be talking about this transformer separated from its radio set, if it were parted out and being reused elsewhere.
Generally, the higher the mains frequency, the less iron you need for the same amount of power. Aviation used 400Hz, for much lighter transformers (you care much about weight in aircraft). And this is also a major selling point with switching power supplies.