[Tucker]

I finished recapping this radio a few months ago and replaced the combination power/volume switch and the radio was playing good up to a few days ago. Now, after sitting unused for a few weeks it has hum that changes with the volume and the audio is distorted. I looked over the wavemagnet antenna and I don’t see any breaks in the wires. I also checked for continuity and all 5 connections on the plug make a connection inside the wavemagnet antenna. 
I’ve checked for B+ and it is present across both filter caps and I’ve retested all tubes and they’re good as well. I poked around with a plastic chop stick lokking for a loose connection or bad solder joint but found none. 
I’m thinking this is probably something simple that I’m overlooking but I’m not sure what to check next.