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It looks like arcing in the high voltage. These little sets are prone to arcing over around the CRT socket and the centering control area. Turn out the lights and make the room as dark as possible. Look for tiny sparks around the high voltage areas and if you can, slightly back off the CRT socket and look there also. Turning the brightness down usually won't make these arc worse. Dirt around the centering control terminals and case are a problem also. Also, look for light blue "streamers" (corona) arouns that area too. These can be a source also.
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