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there are height and lin adjustments as well as a vert centering adj. All of those are used in setting up the correct sweep.
The book I mentioned covers this. There is a correct process in setting up a set, needs to be done in order. a quick summary goes like this
set height and lin using test pattern.
degauss crt
purity setup
center converge with dots from test pattern
dynamic converge with grid from test pattern
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