The Last Transistor, and associated "extra" components, has been replaced. I verified my work with a checklist, and it's very close to being powered up. I have some tidying up to do, along with cleaning the soldering flux off the back of the PA Board, and I'll do that tomorrow with fresh eyes.
And I finally bought a decent workbench for the garage. Now I have a place to mount a proper bench vise, belt/disc sander, bench grinder, and a drill press.
Stand by for pix!