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My CTC5N chassis Whitby is almost identical to yours. In mine I am beginning to see the defocussed silvering highlights the CRT and it appears the CRT has had its day. Certainly under test, the gun emissions are not balanced and Red is dropping off. I am weighing the merits of using a "Britener" to boost the filament voltage.
I tried testing the tube with increased filament voltage and emission picked up on Red. But the guns do not appear to track well.
I would be curious to hear experiences with others aging CRT performance.
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