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A table of brightness results for different crt's with the same cathode beam power consumption would be a very interesting thing. I have driven the 21AXP22A at it's upper limit when I took the photos. Due to the different color sensitivity, an overdrive effect is first visible on the red color.
A comparison of brightness effectivity might be possible with an A63-11X (your 25AXP22) and the 21AXP22A on the same photo, both adjusted with 0.8 mA for the A63-11X and 1.0 mA for the 21AXP22A which is the same power consumption.
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