your killing her
no its like cunnilingus
this, too, is yuri,
So, fun facts: color CRT displays either use Shadow Masks (where there’s a metal grid inside the tube) or an Aperture Grille (where there’s a bunch of thin wires inside the tube).
Shadow Masks are pretty sturdy and shouldn’t be permanently damaged by a magnet unless it’s REALLY strong, but Aperture Grille displays use very small wires, so it’s possible to permanently damage them with a magnet.
But there’s also the issue of magnetizing them: the masks/grilles are not supposed to be magnetized, but if you get big magnets near them, they might get magnetized. This’ll cause the beams to be permanently deflected, causing color issues. This is what degaussing is for, but the built-in degaussing function is limited in how much magnetism it can remove. You can easily magnetize it to the point where you’d need to externally degauss it to fix the colorization issues.
So, these two methods (mask and grille) are needed because the inside of the screen is coated in a pattern of red/green/blue phosphors, which light up when hit by an electron beam.
The beam is steered using the yoke, which is two crossed electromagnets. One makes it go left to right, and one makes it go top to bottom.
By carefully tuning how the magnetic fields go back and forth, you get a raster: a pattern by which the beam can trace the whole screen.
For a color display, all three beams (red/green/blue) are being steered in unison, but it’s important to keep the beams hitting the right phosphors, or blue will show up as red and such.
So there’s a Shadow Mask , or an Aperture Grille. This blocks the phosphors so that the wrong beam can’t hit them, it hit the mask/grille instead.
But here’s the thing: this display is an early Macintosh. It’s a monochrome display. There’s no Shadow Mask or Aperture Grille to get damaged.
All that’s happening is that the beam is being temporarily deflected. As soon as you remove the magnet it’ll return completely to normal!
So shitposting and silliness aside, this should be completely harmless to the display.
Be careful doing this to a color CRT, but a monochrome CRT should give no shits.