I just picked up this zenith in a package deal along with a 17" emerson and a 7" Admiral. I was told at the time that it had been recapped. So I'm watching it today to see how it does, and after being on for maybe 20 minutes, I lose picture and get a dim vertical line. I grabbed some freeze spray and opened it up. Looks like all the bumblebees have been replaced, but electros and maroon drops left alone. In a few minutes, pic came back on its own. Lather, rinse, repeat. No change if I chill the maroon drops.
Suggestions?

Vert tube or tubes.
Bad spot on control ( hgt, size, lin, hold) move them.
Dirty tube socket.
Bad cap.
Bad integrator.
Try tapping around first especially the vert tubes.

73 Zeno:smoke: