[Arran]

I hate the diagram they posted on the Nostalgia Air site, when I see sets built like this, and so poorly documented, my first inclination is to #1 Sell or trade it off #2 Clip the power cord off, shove it into a corner and put a potted plant (or another radio) on top. The only other option is to pray that someone has the original factory service folder for this insult to good electrical engineering, the RCA/G.E/Westinghouse folder will have a chassis wiring diagram with the parts locations shown.
The only good news is that it looks like you can bypass all of the capacitors in that can while leaving the inductor portion connected, if the connection on one end of that choke (marked solder) that is connected to the .025 uf cap is accessible externally. One to start with is the .005 uf cap that connects across the primary of the output transformer, which is also connected to the plate pin of each #45 tube, use a 1 Kv rated cap here, or connect two 630 vdc .01s in series. Of course if that choke is shot you might as well melt the can out and start over.
Regards
Arran