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Unfortunately, it's likely the tube weakening, but you can try re-soldering the connections on the CRT socket board, and/or tap on the board. The 36" tubes seem to be holding up much better over the years than the 27s, but time is time.... I'd pick up a few free spares on CL while you still can ;-)
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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