A 19 to 21 CRT monitor is not needed for the scalines 14-inch monitor with the cru program in standard CRT mode, just set the resolution to 640x320 at 100Hz and beautiful 17-inch scalines come out and set 480x320 at 120hz, that's the trick. They need an expensive Sony CRT monitor, so I use it on my 2 14 and 17 inch monitors, beautiful scalines come out without so much fart (note CRT monitor with cru program

I say this so that they stop selling these expensive monitors of course they are a gem but I do it so that if they want to play retro games they don't have to buy or get 19 to 21 inch monitors that take advantage of the situation so that you know In any CRT monitor, no matter the inches, you can play with scan lines