Without seeing the rest of the power supply circuitry (L page 40?) I suspect by the number of secondary windings is that this receiver uses both positive and negative DC voltages. As such you would need some kind of DC to DC isolated inverter section to generate at least the negative and maybe both polarities if they are required to be higher then the +12volt available in a car. So your probably better off just considering a standard 12vdc to 120vac inverter of the proper wattage. Keep in mind that inverter use for audio service is often quite 'noisy' and distorted if not well designed and filtered.Lefty
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