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Sounds like the degaussing circuit might be doing something weird. Try unplugging the degaussing coil, and manually degauss the tube. Then cool it off, and see if it still goes wrong. If not, you need to check the degaussing circuit, starting with the 3-legged thermistor. Those can either get bad solder joints, or go internally bad. You can get one out of most any color TV from the 80s or 90s, if you need.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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