[Jeffhs]

I appreciate all the advice, but I'm not sure I want to try to replace parts under the chassis; I've only replaced a chassis component once in any of the old radios I've owned, and that was some 25 years ago or more. Besides, I don't know where I would get a 1N4007 diode, as the only Radio Shack store near here closed a few months ago and I don't know if there are others in this area. I think there is still a RS store about 20 miles from here, but since I don't drive, I don't know how I would get to it.