Starting on another RCA Portable

[Eric H]

Thanks.
I'm not done yet though, the horizontal is rock solid but the vertical still has an issue, it's rather unstable. It'll be fine for a while then the retrace lines get bad and it starts to jump.

Every RCA portable with this or a similar chassis has had difficult vertical issues, must be a really bad design or they all have something common bad in them.

There is one of those integrated Couplates in the Sync circuit I think, similar to what the Predicta has, I wonder if it could be going bad?

Oh and in answer to Maxhifi's question, yes, the board is soldered to the chassis around the edges, not in a way that can easily be removed either, you have to unsolder a metal shield from the bottom of the chassis to get access, it's fairly easy to work on after that.

Actually, I wonder if my vertical issue could be caused by running it without that cover?