[old_tv_nut]

When viewing them, they will be moving, not stationary as in the snapshots. It is important to view a large flat area of color. That's why color bars are best. Variable areas and edges generate sidebands that produce dots that cannot be nulled out by the trap. You will always see some dot crawl on edges. If you have an oscilloscope, you can look at the luminance amplifier output and null the "fuzz" caused by the subcarrier.