My Zenith Model 1512J Television

I picked up this portable TV as a freebie, advertised on Craig's List. It's not working, though it looks good enough for a display item. The original cord was cut off at the plug and so I removed it and found another cord with a plug of the same size (after reaming out the holes). Several tubes seem to light up but not the screen.

I believe it should have rabbit ears or some kind of an aerial on top but it just has a cable connection wired in. I found a similar TV shown on Ebay, dating from 1957. Would anyone have an original magazine ad for it or more information about it?

Jim