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I tried sever RC combinations, 470k and 22uf seems the best for spot control with miminmal impact on time it takes for the full brightness to be achieved when the set is turned on. Again this is just a series connection from the cathode to the ground. during operation the cathode has a positive charge, when the set is turned off this charge goes away, and the spot comes on (very bright dead center of the screen). by using the RC combo the cathode maintains a positive charge long enough for it to cool down and stop emitting.
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