Have you plugged it in to check for voltages at the 12 points?
Usually that old stuff can be plugged in not terminated, due to no solid state components.
I haven't tried yet. I want to go through the wiring first.. I wish I could find a picture of what it should look like Being there is no front cover.
That big tube was likely part of the recifier to change 120 VAC to a lower DC voltage. I don't think anyone makes anything like that now days. Most of the later units use the big diodes that have the threaded end on them to attach them to a chassis. That's definitely an oldie. Tungar bulbs are kind of rare.
Check this out: https://www.youtube.com/watch?v=nR1ZLC7t4Ns
Mr. Fibber McGee
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