Well, I consulted my boss(we work at Vacuum Tubes, Inc.)and he says it has a bad filter capacitor. I didn't really have time to take apart the radio and remove the chassis to clean, and I was a little afraid to do so because of how tightly packed in everything was!

I haven't the slightest idea where the cap in question would live inside the radio, or what kind to replace it with. Does anyone know what I should look for? Thanks again.
P.S.- I read your article, Phil, and you're definitely right about that chrome-mine is bubbled and peeling off in a decent number of places. Although my handle seems very solid to me.