[Warren]

Best thing to do is to replace ALL the old caps. Maybe because they are so old they change value on you, plus it is dangerous to leave those old caps in there.. sooner or later they will go out.. could go out with a fire. Good chance after those are replaced your problems will be solved if you have also checked all the resistors. There are a lot of people here more experienced in the electronics than me that might have more ideas but these are a couple basic things that need done before other things.