[davida]

Thank you for that link.
I took some pictures of the inside of the radio while it was running in a darkened room. I love the glow of those tubes. I think it would be nice to preserve as much of the radio intact as it is. It looks simple enough to use that aux input to connect my external source - I was going to put an Apple Airport Express inside which has the same type of connector as an iPod dock.
I wasn't clear from the circuit diagram exactly the right capacitor to use. It looks as though it is either .1μf or 1μf (and my knowledge of electronics is that limited that I couldn't be sure if those values actually exist!)

I have removed the chassis and loud speaker from the cabinet now to begin cleaning and re-finishing the wood work.
The speaker has what appears to be a transformer coil on the back of it, I am assuming this is in leu of a permanent magnet and the speaker is driven at high voltage. It doesn't need replacing, just curious.

I removed the glass from the tuning dial for cleaning. The decals/paint are quite fragile on here so I am going to very carefully try to clean the glass between the paint using warm water and cue tips.