Quote:
Originally Posted by Electronic M
There's a line of imperfect purity on the screen that I suspect is a defect in the shadow mask.
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That's your answer.
A three gun color CRT is really a marvel of its time, and it's crazy how good they actually were in mass production.
I remember a couple of picture tube jobs that really fought back when trying to converge. They were so easy to change, we would sometimes just return the tube to the local dealer as defective and the new one would line right up. Fortunately, that was a rare occurrence - maybe 10 in 30 plus years of doing quite a few of them.
Between a less than perfect shadow mask and a gun just slightly tweaked either globally in the neck or individually in the assy, you'd get one here and there that was obnoxious.
John