I dug up a used 16DP4 CRT to try out tonight.
First without a focus coil just to see if I could get something.
Promising, so I slid the focus coil on the neck and spent a little time adjusting it, the ion trap magnet and yoke.
Better.
Yes, this will work. Hoping to use a similar 16LP4 which has the right deflection angle eventually.
