The crashing is due to some kind of instability when the +5 VL has no load. If I add enough constant load on that supply, the off condition doesn't cause any trouble. It's not something shorting out, but the opposite. I need to check some caps and R value changes in the supply and make sure all are up to date according to the mod history. If needed, I think I can fix it with some extra permanent loading.
The A-horizontal seems to work when the 7B53A plug-in is set just right mechanically - a contact problem I think. I can apply pressure to the bottom of the plug-in to make it fail. It's weird that when it goes bad, both axes are shrunken to about a quarter of normal. I'd think only the horizontal should be affected.
Ed
