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Originally Posted by asynchronousman
Refine your definition of "turning up the bias" please. It has color, hue and tint if anything and an AFT/color/contrast type switch. I do know that when you adjust for the "best" color picture the bright "blue" screen generated by many VCRs is blood red and green is more bluish. It took some effort to prevent it from looking like "Halloween" or two-color process movie films, which is why my original beliefs have leaned towards a bad gun. If I recall, it may affect colors in the way you've mentioned. I also recall the the color was much better when I bought it at a yard sale 3-5 years ago.
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turn the color all the way down.
on the crt socket board you will find controlls marked drive and bias or background.
the bias adjusts the background and the drives the bright areas.
there is a drive and bias for each color.
if you turn up the red bias and the background goes red its not a purity issue.
try to borrow a degausser or bulk tape eraser and degauss tht tube.
looks more like bad purity in the(poor) pic you posted.