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If you are interested in efficiency then you can buy different transformers, or alternately use switching-type regulators to get the different voltages.cant he use a voltage divider? What if he got a 42V transformer to power up several equipments eg.an amplifier(it contains, preamp,power amp,etc)that needs different voltages to different circuits.eg.18V to preamp,35V to power amp..etc then must he buy different kinds of transformers for each circuits?!! Just a doubt.