The schematic shows pins 5 & 6 connected to a loop on T3, the flyback transformer. That is the filament winding that Bill mentioned. Pin 8 connects internally to pin 5, so either of them could be used for this purpose. If the 486K resistor in your diagram is R89, then your hookup looks normal.
Do you see anything at all connected to other pins on the 1X2 socket? Pins 3 and 7 are not used for anything, so they would be free to use as tie points for unrelated stuff, although I don't recall seeing any such things on a HV rectifier socket before.
Phil Nelson
