Quote:
Originally Posted by old_tv_nut
A design that allowed spot burn should have been corrected quickly, but sometimes a problem escapes engineering until the last minute, or happens only in marginal cases where all the component variances are in the wrong direction....
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I think it's more an issue of the image collapsing to a dot 100s of times and the damage slowly accumulating.
I've mostly seen it in 21" sets from the late 1950s. CRTs like the 21CEP4, 21ESP4, 21FDP4, etc.