So Bhamham was kind enough to offer me a pair of these to experiment with. I haven't gotten too far, need to order a few caps but I was able to draw up a schematic. Its not quite a polished one, but it should get the point across. I did not draw in the output socket though, mostly because I forgot. Pinout on that is as follows:
1 - chassis ground
4 - output transformer black
5 - output transformer yellow
8 - output transformer green
Seems to me that 4 to 5 is the 25v output. To tie an 8 ohm speaker to it, connect 1 to 4 and send that to speaker -, pin 5 to speaker +.
Voltages marked on the supply are not accurate, the caps are in pretty sad shape and one started ailing and eating a lot more current while I was taking readings. Once I get caps in it that work I'll give it another go. You know the deal, no matter how many parts are in the bin, the one that is needed isn't there.
Overall the design looks fairly solid. Split load inverter, extra triode gain stage, power supply that should be reasonably stout. On the list of things to add is a bias level control and test points, but thats easy stuff.