Zenith am/fm table radio

[jln1966]

I have a Zenith am/fm radio I got on ebay last summer. I am now getting around to working on it. I am not sure of the model # but the chassis is #7c06. I beleive it is a 1959 model. It does not power on at all. It does have a selenium rectifier that will need replaced plus a recap. Also there is a 2 stage .0047 ceramic cap connected across the power line that is bad. The area around it is blackened and a lead that connects to the chassis is burned off. What would cause that and whet do I replace the rectifier with?
Thanks,John