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Saturation point. I recall seeing this on weak tubes where the capacitance between elements would hold enough voltage to "lag" or smear the highlights to the right when G2 was pushed too high during the peaks.
As a young teen I got this early 70's Panasonic "Quintracolor" modular set that had no red gun. After several hits of my uncles 467 it began to show life but never really recovered, I was always looking for the "why" answers to the point of becoming an obsession. It also had a bad power supply module and being 12-13 at the time my understanding of the SCR regulator was all but non-existent and I ended up with a 13" hybrid Panasonic "swivel" set. Decades later the CRT is still an obsession and I find myself spending more keeping the tubes alive than the cost of a high end plasma or LCD based flatscreen.
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