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ok so you are seeing .5ma to 1.5ma depending on raster brightness? of so then shunt is working.
HV holds steady thru those changes (raster brightness)? if the shunt is working then this should be steady.
if the above is correct then maybe there is something wrong with the video output that is causing a bias issue at the CRT, the video output during normal siganals (not raster). Is this what is happening?
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