'50 mercury radio stops working after a few mins

[JohnHacker1]

I (kinda) helped a friend fix an early car radio recently.
There were at least 2 dozen different types of vibrators made-just cuz it fits in the socket doesn't mean it's the right one.
We had to really search for one cap., it was INSIDE of the transformer housing. And burn't to a crisp.
Best would be to post the schematic-lots of good radio fixer-uppers on here.
There are 6-to-12 volts converters available also-and properly ground it-pos. or neg.