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On any set with this type of board, we added a 220 mfd/25 volt electrolytic from the control grid to ground. We also added a .22/600 volt capacitor from the screen grid to ground. I can't remember how we discovered that these tubes were shorting from control grid to screen grid but once we started doing this "mod", when the tube would short, the customer would hear a snap and the picture would go dark instead of ultra bright. In a short time the tube would come back up and the sets didn't come back with the regulator fried and a dead CRT gun. The only thing the customer commented on was the set made a brief swirl of colors when they turned it off.
And a small capacitor near the jungle IC would open driving the picture nuts and the horizontal would go nuts too!
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