Zenith transoceanic H500

[vortalexfan]

First of all, you NEVER use any sort of chemical sprays on the tuning condensers on these old radios, because you'll ruin its ability to conduct properly, the only thing you should use to clean the "fins" of the tuning capacitors is compressed air, by using the DE-OXIT on the Tuning capacitor like you did, you may have ruined the tuning capacitor.

I would of first checked some of the tubes to make sure they didn't go to air, or didn't go bad.

Also I would of taken the chassis out of the cabinet and made sure the radio was actually restored, because there have been cases where people have been selling old radios on ebay where they claim to have "restored" them, when in reality all they did was clean the case up and and clean the chassis up and that was it, if you still see old paper capacitors (or old bumblebee caps) under the chassis then you know it wasn't actually restored.

I hope this helps.