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In my Portacolor which was built in 1977, the boost voltage(several hundred volts) is on some of the rear adjustment controls. These controls are in a common package, with some controls seeing the boost, some not. This caused carbon tracking in the controls. In my particular set, the AGC control was affected. The TV would work, then the AGC would overload. Then it would work again.
After I took the ganged rear adjustment control apart a cleaned it completely, the problem disappeard. This is a tedious process as these are crimped together in my set and care must be taken not to break the metal tabs when unbending/rebending them.
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