The replacement control arrived and it tested good so I installed it. Power. volume and contrast are all working correctly now
I then went through the vertical circuit and everything checks out. For example, here's the vertical sync pulse at 2 V p-p just as indicated. So although it's a little touchy, I think it's working as designed.
I'm going to let it run for a while then ship it back to it's owner. I sure hope he's able to wire it up to his CRT and get it running at his end.
