Nah. The pic works just fine. In a worst case scenario,copy n paste. No reason to redraw the schematic. Pic show what i point out. You see a long grey wire leading halfway cross the PCB? To the right in the pic it ends as a small solderjoint. Just left of that solderjoint is the machines center starground,as i guess is quite evident. The grey wire is basicaly soldered directly at the solderjoint for the rectifierbridge negative,which is turn leads for that starground on the PCB. To make it even more logical,i recap. Absolutely nothing is to be installed between the point of where the bridge negative or the PT´s centertap hit the circuit,be it a PCB based point or chassis,and the grounding of the first electrolyte. Nothing. Simple as that. The purple marked area is the forbidden zone. If you ground anything but the negative/CT and minus for the first lyte in there...the amp WILL hum. To a larger or lesser degree. Period.