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Thanks for the suggestions Don.
I got the screen bias from the B&K465. I had it set at 300V for the 5AXP4.
During the test the CRT isn't hooked up to the set. It's just physically sitting in it. The brightness is essentially what I'm adjusting by adjusting the G1 bias.
I'll play with the ion-trap and perhaps raise the filament by 10%. If that doesn't give me anything I'll put a 10BP4 in that should work and see if it's a problem with the beam optics due to the ion-trap or focusing magnet. The focusing magnet is adjusted differently than the manual suggests. It says to keep the screw shunts adjusted the same as you adjust the focus. There are two of them. Whoever adjusted this one, could be the factory, has one at 1/16" and the other at 3/4" gap.
When I played with the 5AXP4 I just had it laying on the bench since it doesn't care about the focus or ion-trap.
John
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