i will go ahead an put my .02 into this, but here is a photo of everything in a omega race laid out on my floor minus the marquee, flourecent lights and the art glass. here ya go, this is what you are missing.
whole setup
off the xformer taps i see, 18 v h, 18v center tap, 18v low <-going to board 3 pin connector, 3.16v,0, 3.16v going to ps board, 6.3v,0, 6.3 heater voltage?? 30v, 0, 30v <--- going to monitor
the big MT89A that plugs into the filter assy has 9VAC and 15VAC i think comming out of it unreg.
caps in filter assy are 100,000mfd/uf 30vdc and 55,000 mfd/uf 25vdc
3 pin connector voltages are the one with 3.16v... im guessing the battery charger circuit???