I'm just about done with the rest of this set. The audio is still weaker than I'd like, but at least I have some.
This nasty splice wasn't helping

That explains all the noise!
I'm not sure what impedance coax to replace it with, but maybe it doesn't matter much at audio frequencies ?
I wonder if anyone carries cloth covered coax ?
I'm just about done with the lower chassis too. I used a mini-hack, heat gun and corkscrew to gut those capacitors.
It's less messy than the Dremel with cutoff wheel I had been using.
I also discovered that the tuner was pretty dirty and rusty so popped it out and cleaned it up
Next up - re-coating the CRT dag and restoring the cabinet...