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Everything on this diagram is on the power supply chassis isn't it?
With the power supply disconnected from everything else you should be able to put 120VAC on the primary where the Phono Motor is attached and run the power supply by itself.
If you still get red plating on the rectifier then the short is on the PS chassis, if not then it's further downstream in the TV or radio chassis, it should be fairly easy from there to figure out exactly which circuit has the short on it.
I'm guessing your High Voltage is low because of the drag on the power supply voltage.
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