Plain vanilla - the larger board produces +/- 21 volts (at 4 amps) (heat sink omitted). AC from a toroidal transformer. The smaller board produces 6 volts. The latter is the lamp supply for the (ridiculously expensive (Swiss)) panel switches (which are using 6.3 V 1.26 W little bulbs rather than LEDs). Most of the electronics will use +/- 15 volts which will be down regulated from the +/- 21 volts locally on each board - as seems to be the fashion.
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