Zenith Roundie Craigslist Score!

[Electronic M]

Most Zenith vert integrators were installed between the synch sep and the input to the first vertical multivibrator tube, and filter horizontal noise out of the synch....If it synchs good leave it be. Some times they also used them in the feedback from the vert output/second multivibrator to the first vert multivibrator section.

Never found a bad Zenith integrator so they would be far from the first thing I'd suspect as the problem. Get the caps and resistors in speck before you worry about it. The sam's should show the way replace it with discreet parts.