Quote:
Originally Posted by old_tv_nut
?? Reference ??
There are two kinds of shadow mask warping, neither of which produces a "wavy' pattern, but instead a color purity problem.
1) thermal warp from high beam current - can occur with a constant area of high brightness, but reverses when the beam current is lowered
2) mechanical warping from dropping the set - permanent
By wavy pattern, do you mean moire'? This is a design issue of dot size vs. scan line spacing, and is permanent for a particular tube design.
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Yes, here's a vid I took showing the subtle pattern around the screen. Be sure to view with good resolution, as it's subtle and hard to capture on cam.
https://youtube.com/shorts/6nk-TYi0JOM?feature=share
Image example:
https://ibb.co/k6b1kw0