The inside of the signal generator looks in pretty good shape, almost like it was assembled yesterday. Plugged it in, turned it on and was rewarded with a soft orange glow from the two vacuum tubes inside.
There's one very large electrolytic cap that's marked 20 MFD which according to the schematic appears to be a 20 μF cap. It has two positive leads going into it and I'm not entirely sure I'd be able to find an exact replacement for it. Probably need to sub in 2 20 μF caps if it does need to be replaced.
The guy at http://www.heathkit.nu/ replaced the two signal outputs on his IG-102 with BNC connectors, which seems like a pretty good idea and something I think I'll try to do as well. Otherwise I'd probably have a hard time finding leads with the original style connectors to use. I'll need to find some panel mount BNC connectors (female) and might need to snip/replace some capacitors to replace the old connectors.