If you shrink it down to the point where you have the same number of scanlines across the same number of dots as an arcade monitor, it should look similar. Unfortunately, given the drastic difference in dot pitch between a TV tube and monitor tube, the image will be tiny at this point. It's also usually impossible to get the low res modes used by old games out of a PC CRT anyway unless you double the refresh (which can be an option). Keeping the refresh rate the same will generally require the use of doublescan, which destroys any scanline effects in their entirety since each original scanline is actually two.