Not really, CRTs work in a way pseudo-analog masked fashion.You can Measure Horizontal and Vertical Resolution using a test pattern like this.
https://commons.m.wikimedia.org/wiki/File:EIA_Resolution_Chart_1956.svg
The part in the middle that says 200, 300, 400, 500, 800 is how you measure TV lines. The point at which the black lines converge to a single line is the number of TV lines your display has, and the resolution and fine detail it can resolve. So if they converge at the 300 mark then your display supports 300 TV lines. If they converge at the 600 mark then it's a 600 line display.
They don't really have a native resolution.
And anyway, the "480" lines from NTSC (the raster) is actually related to vertical resolution of the signal, not of the CRT, a continuous horizontal line is drawn 480 times (in two separate 240 lines interleaves) to produce a picture.
Regarding the phosphorous cells in the screen, they are not pixels, they are just masked groups of red/green/blue, each one of those masked groups can be exited in many different points with different intensities, each one of them contains as many pixels as you would like (as long as you can really focus the ray good enough along the cell).
I think I can find you a good youtube video that could explain that better than me.
PS:
I think the explanation is not superclear there, but if you pay attention and try to really understand what he is trying to explain you will get it. The fact that there's video and pictures to illustrate it makes it also easier to understand.
Last edited by sarkwalvein,