Its confused because V3 splitter driver is physically on the op pcb, but all
3x .3 amp heater valves (6.3V setting) are in parallel for .9 amp total at
node ( 6V or 6V1) and then in series with the 4 output valves, each at .9
amp so in effect current-wise 5x .9 amp in series and 5 x 6.3V supply