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If I were you, my next step would be to acquire a Sencore CR-70 or CR-7000 and check the emissions on the red gun. You have put some time on the 15G, probably not a lot though, and cathode material is finite.
Given that the beam current on the red gun is so much greater than on the other two, I'd want to rule out poor emissions first. The drop off in emissions can be rather fast in a tube that is driven hard. I think the red gun of a 15G would qualify...
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