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Look around the middle of the set. The power supply regulator is mounted on the heat sink near the middle. Change the electrolytics in the section the IC faces. They dry out and B+ starts to vary and this van cause a number of problems. A ESR meter helps plenty on these sets.
Also, on the right front as viewed from the rear of the chassis is the vertical output IC. This develops bad solder connections. Be careful not to bridge any pins as it will blow the IC.
Good luck.
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