Well, playing with the ion-trap didn't help, neither did the focusing magnet. In a later supplement they refer to the focusing magnet as a focalizer.
I'm trying to get the 10MP4 out of the chassis. The rubber mounts under the front of the CRT are really stuck. The manual suggests using a putty knife between the steel mount and the rubber, but the old rubber and glue is very hard now.
I'll have to remove the front panel with the CRT. Not too difficult except that I need to get a higher wattage iron to remove some leads soldered to it. Once I get it off, I should be able to remove the panel from the CRT.
The ion-trap seems weak, but I don't have much experience with them. I do know that it's supposed to be about 35 gauss. I can check it tomorrow at work with a Hall probe.
John