TV Zenith Solid-state 70's

[dtvmcdonald]

As to the color in the convergence pattern with color turned on: that's normal.
Its caused by beating between the color subcarrier and the sharp lines that
occur at random phase with respect to it.

There was a "prefilter" thread here recently that puts a bandpas filter
on luma in an s-video signal before mixing luma and chroma.
That would eliminate it.