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yoke burns are PAINFULL, much worse than HV, more current available I suppose.
Just remember that that purity and convergence setup are effected by sweep so if you go thru the effort to adjust those before fixing sweep, you will prob just have to do it again when/if you get the deflection working.
process in this order AFTER the set has been on for 20 min to warm up.
full raster (vert and horz)
setup linearity with test pattern
purity best reds (yoke back/center red blob/yoke forward to best fill red)
center converge (dots) focus for sharpness and keep the brightness down
dynamic converge (cross hatch)
grey scale
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