Dot pitch on a crt might make the image look bad (trying to draw onto the shadow mask) but I doubt it would damage it.
Setting an invalid dot clock could damage some crts. But most of the modern (read from mid 90s on) would just go to the power save mode when they got a clock they couldn’t use. The warning did still remain on the xfree86 configuration guides though.
Are you sure it was dot pitch and not dot clock?
Dot pitch on a crt might make the image look bad (trying to draw onto the shadow mask) but I doubt it would damage it.
Setting an invalid dot clock could damage some crts. But most of the modern (read from mid 90s on) would just go to the power save mode when they got a clock they couldn’t use. The warning did still remain on the xfree86 configuration guides though.
Showing my age perhaps.