More pictures:
The high-voltage cage. The empty tube socket in the left-center is for the 1X2B focus rectifier; there may be a solid-state diode underneath and not visible. I plan to restore this whole area back to the original circuitry to the extent I can.
The replacement volume/power knob. It looks pretty close to the originals I have seen.
The control box and knobs. The knobs are not the originals, but I may have correct ones in a box of knobs I bought years ago. (I know I have at least two, because I just saw them on a wood-cabinet 10" GE that I got without knobs and used ones from the box).