Thanks Justin. I found that document and it's what I've been using. There's no load on the output and the current meter confirms zero output current. Poking around carefully with my DVM has so far shown me that the transformer, bridge rectifier and reservoir caps are producing the unregulated rails. The schematic shows a long tail pair as an error amplifer, and this has about 0.44V error at the input. My knowledge of pentodes is pretty rusty, but I'll look at the pass elements next.

The hand annotated voltages don't say what they are referenced against, which is a problem with so many floating sections.