1964 Zenith 5111 comes to life!

[Tubejunke]

Originally Posted by old_coot88

Can you post a schematic of the color section? I'm betting that the problem is something other than the crystal, based on your statement that the color was strong and in sync prior to the sudden drop-out.
Bill(oc)

I don't have a way to scan a schematic, but later today I might be able to post or send you a PDF to look at. Again, from the get go the color took maybe five minutes to come in, but when it came in it was fine. I thought for sure that it was just a weak tube that was taking longer than others to achieve enough emission to do its job. Each time I powered the set it seemed to take longer and longer, till no color at all. I have a lot of studying to do for electronics tests this coming week, but I hope to at least have time to give the color killer potentiometer a good cleaning in the next day or two. I doubt that is the actual problem, but I know that it needs cleaning as it was a bit jumpy when I tweaked it the other night. Also, I need to give the underside of the chassis a better visual inspection and maybe check out some resistors. I already found the horizontal "efficiency" coil that seems to have a broken backbone (plastic), but it doesn't seem to be causing any problems. However, it might be why the horizontal hold control is off center. For now I want to focus only on color issues.