My Brand New CTC-7!

[dtvmcdonald]

To check whether little magnets around the edge are the solution,
try a refrigerator magnet. Don't hold it close unless that cures the problem ...
you could magentize something. Bring it up slowly from the side towards the
problem area, rotating it every possible direction as you so this.

I've used this method with a CRT device we use in my Physical Chemistry
teaching lab: the beam in it normally runs from 10 to 150 volts over all but the
last 1/8 inch .. imagine a 5 inch CRT with a shadow mask, the cathode
at 0 volts, final grid in gun and mask at 10 to 150 volts, actual screen at 5 kV.
Magnetic field nightmare. Little magnets work great.