You can not make a rectangle delta CRT perfect. The L & R blue
is hardest. So here are some hints.
Warm se up a half hour.
Turn OFF the color
Turn down the brite & contrast & adj focus for sharp dots & grids. The idea in
not to drive the CRT hard.
Do a DGS then purity then lock down the yoke.
Do center only looking at that.
Move on to the instructions but recheck the center as you go.
Using a mirror dont work for me. I would lay across the set & look
directly at the screen. Much faster.
BTW on the conv PCB there is a red square. Thats a diode pkg and they
do go bad.
73 Zeno
LFOD !