How to narrow picture

[ppppenguin]

Assuming that the set is working normally and B+ etc are correct, a simple way to reduce width is to put some inductance in series with the scan coils. I've done this on a few simple monochrome monitors which had no width control. A few turns of ordinary hookup wire on a bit of ferrite rod does the trick.

Far better than putting resistance in series with the scan coils, which are largely inductive at scan frequency.