[Jamie]

Thanks Arran. I replaced the cap in the tone control and it appears to be working fine. The tone control works on all three settings now. The only remaining problem is hum. The radio hums all the way across the band. It's not terribly bad, but it is annoying. The hum increases if you increase the volume. Other than the hum, the set actually works well now. It pulls in some distant stations too. I've replaced all the caps, and I've checked and replaced resistors too. There is also some distortion and garbling above 70% volume level. I'm trying to trace everything according to the schematic, but it's very difficult.

Phlogiston, thank you. As soon as I removed the wire, plate voltage on 42 came up to 245. I'm using a DMM to measure. I'll check the other voltages too and report back.

This radio must've been fairly new when someone attempted to repair it. The bad wire I found was almost identical to the original cloth wiring. I only found it because, when I first looked at the chassis, there was a huge, melted paper cap in that area. It was not original. Then I noticed a huge glob of solder connecting this wire to part 33-3222. I'd originally attributed the solder glob to the melted cap, but the wire had been added too. Perhaps this repairman was trying to fix the same hum I am experiencing?

Any ideas where this problem could originate from? If I could narrow down the hunt, it would be a great help. Thanks.