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On a related note, I just finished recapping a GE set with a U4 chassis (21" B&W, 1960). It worked OK before, but I replaced the electrolytics in an attempt to bring back full vertical deflection. That didn't do it (it ended up being a drifted resistor), but I did test after each can replacement. After I replaced the main three section filter, the turn-off spot became much longer lived and brighter. So much so that I'm worried about damaging the picture tube. Before, the picture would shrink into a dot on turnoff, and the dot quickly faded. Now, it shrinks into a dot and stays there - very bright. Even turning down the contrast all the way to produce a dark screen before killing the power won't prevent it (although it's less bright). The replacement caps are the same values (within tolerance) of the originals. What happened? What can I do to minimize this dot? The turn-off dot is a nice classic thing, but it shouldn't last this long, or be this bright.
-Ian
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