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#1
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The RGB Y tube sockets could easily be cooked, too. I know the twin triodes they used on the RCA sets would cook.
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#2
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Check the plate resistors on those triodes also. They tend to cook down in value raising the plate voltage on the tubes. This will upset the CRT voltage on the grids (altering the brightness of a given gun) and cause a very short life of the color triodes as well.
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