Beautiful set
I hope you had an easier time with service info that I have. I've never found a 430 specific schematic and the 423/425 info doesn't quite match mine.
So as Kevin mentioned, I have pulled the Sentinel out for some servicing. All this time I've been running it on the weak CRT it came with but it's nearly dead and needs replacing.
I guess the sales flyer claim of 17" was accurate after all.
Here's a shot of how the set was playing. The CRT lacks focus and it gets worse as the brightness is increased.
Back when I got this set I had assumed it had an early 16" CRT in it, but it turns out I was wrong. If I had just peeled back the rubber trip on the CRT I would have found this label showing it's a rebuilt 17BP4!
So I can't really using the nice aluminized 16KP4 I found
I do have a couple good 17BP4s although neither is aluminized. I chose the one with the best external coating and installed it.
That's too bad though because it means my
17T13 with dead CRT will have to wait. I then checked all the tubes, found six weak and/or shorted and replaced them.