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If the rectifier isn't the problem the cup it's socket is in might be...I had a friend's 13" Zenith tube color on the bench a few years ago and that set had HV rect socket cup arc through....the point of the screw that held the socket in the cup was arcing through the cup to the chassis. My solution was clean the living daylight out of the cup to confirm condition, drill out the arc hole and carbon path near it, fill the drill hole with RTV silicone to block the arcing path, and shorten the screw and round it's point to avoid a relapse....worked like a charm, and hasn't failed yet.
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