Based on that definition, I'd say dual transformer should have dual power cords to separate circuits, then to dual power distribution panels.The Meridian G51 uses a twin secondary single transformer.
That rules it out if you ask me.
The Pioneer SX-1980 and SX-1250 use the same, twin secondary TX/former and separate PSUs and amps.
Personally, assuming ONE power cord means that there is no advantage to having more than ONE primary winding. But that's just me.