You have been given some good advice from some of these guys. In another life, I worked on stuff like these old radios. Since you said the light is on, your fuse is almost sure to be OK. Still would be silly not to check it. Of course, I would test all of the tubes before going any further, simply because it's quick and easy. It's hard to find a tube tester these days, but most communities have some old guy who works on old electronics for a hobby. He'll have one. If a tube checker says a tube is good, then it probably is. If a tester says it's bad, then it MIGHT be bad. Beyond that truckernix and bouymaker gave you good advice and I would follow it. If it were me, while I had the radio apart, I would change all of the old paper capacitors, and the electrolytics capacitors too. If they're not bad right now, they will be in the near future. Oh I forgot to mention, if your vibrator is working, you should be able to hear a faint humm from it, unless it's been replaced with a solid state vibrator. I would replace the vibrator while it's apart too.