The rectifier is not Selenium. It might
be Germanium, but is likely Silicon. The oil condenser almost
certainly means the transformer is ferro-resonant, which will
give fairly good output voltage regulation. You can try
reforming the electrolytic condenser, it may be fine. the AC
power cable plugs into an old industrial connector, usually made
by Cutler-Hammer. My model 19 uses a similar sized 4 pin
connector. Try making a search for old industrial power
connectors, if you can find a NEMA number you are on the way to
finding the connector. You might consider changing out the power
cable to a modern one, and gain the safety of a ground wire.
Bruce Gentry, KA2IVY