I recently picked up a Suzo Happ power supply for my Neo 25, 4-Slot MVS.
When I set the 5V to as close as to the value as possible (5.1V), the 12V lowers to a little over 10V (10.2 or so).
If I raise the 5V to around 5.7V, then the 12V raises to 11.5V.
But I fear leaving it at close to 6V...