Thanks for all the tips. Yes, the pattern generator is working properly
I noticed the old 5U4 glowed blue briefly during startup and replaced it with a NOS Westinghouse.
I also replaced the 6V6 vertical output tube which had a noticeable effect! I had more height and the linearity control was more effective.
Still need to check the horizontal yoke cap.
Here's what I've got now. I think it's pretty watchable
Odd that we both have trouble with that Jughead hat shaped tube
Notice that dark speck near the top center? That's actually a bubble of air in the glass! I have some in another early GE 10FP4 too.
Almost forgot - a new 560 10W focus coil resistor arrived yesterday. I'll pop that in and see what effect it has.
