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As for replacing capacitors, those old lab supplies used the most expensive parts and often the capacitors are still good. At least, mine has original capacitors from about 1961 and it works great.
As for a diagram, it's a relatively simple series regulator. If it doesn't work, check the ac outputs of the transformers, then the dc outputs of the rectifiers. See that the tubes all light and there is voltage on the plates. You have to measure these voltages with respect to the negative supply output, not the chassis. See that all the VR tubes glow.
You might be able to contact the company and get a copy of the diagram.
Yes, hams would be interested. Especially these days, with a major resurgence of boat anchor interest. Talk to someone from the local radio club or post it on QRZ.COM as some suggestions to get it to someone who would appreciate it.
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