|
Update: I had fixed it and I didn't even know it. I replaced that diode back with the original one and now the horiz will sync through 3/4 of the span of the hold control, much more stable than it ever was. My guess is that those diodes aren't interchangeable between the set I pulled it from and this one. Now I'm dissapointed that I don't know which of the many pieces I changed actually was bad.
But if you look that one scope image taken between the 2 diodes (w13 - the one that only looked as it should if the AGC was cranked all the way up so there was no picture - top middle in the last post) is better, but there's still some of that junk in the background (see pic below). And those ones from pin 6 and 7 of the 6BU8 still don't look anything like they should. Oh well, I guess it doesn't really matter as the set now works.
I still have to find 51pf caps to replace those 68s that I used to replace those 2 51s. I wonder if that'll do anything. Also, anyone know what a modern equivalent for that 2 part diode is, in case I do need to change it.
This set was really the exception to the rule of these 60s Zeniths being nearly problem free, that one I just worked on with the broken crt mask had been sitting out in a barn for decades and used so much prior to that that the crt is a bit weak worked as is, this one that was packed in it's original box and hardly saw any use during its life, has had loads of problems. Either way, as much as I like space command, I'm taking this set out of my daily watcher rotation, so I don't have to keep fixing it.
|