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I connected an electrolytic cap from the brightness line (connected to the grid of the CRT) to the B+ of the power supply of the TV set. That way, when the set is turned off, the B+ collapses, and the charge on the cap pushes the CRT grid way negative to cut it off while the heater cools down. This cap eventually discharges, but slower than the heater cooling down. This avoids the spot on the tube after shut down.
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