My observations in general are:
The are great until they break.
For the most part they suffer from internal bad solder connection due to years and vibration. I have repaired several chrysler factory radios with just a soldering iron.
Common problems are one or more speakers quit working or work intermittently, and the display on the front of the radio goes out or works intermittently.
On the Old 'tune-o-matic' AM car radio its pretty much the same story. The controls get very dirty and scratchy. Buy a can of 'tuner and control cleaner' from Radio Shack can take care of them. Remove the radio and take the cover off. Spray the controls and work the knobs back and forth. Do that several times and it should take most of the scratchy noise out. If that doesn't fix it, its just a case of the control being worn out completely but cleaning usually takes care of it.
The old radios were generally built like tanks so they are usually easy to repair. Its usually bad connections.
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