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If you could find the schematic that would be a big help. Flying blind is a good confidence builder until one starts to hit the sort of odd little bugs I'm dealing with. I'm enjoying the portacolor. There are a few tiny bugs I need to address(I think a couple controls need cleaning), but otherwise it works a lot better than what I'd expect from what I've read about portacolors.
Tom: Thanks for the info. It did have a dark tinted safety glass, but it got destroyed in the cataract removal. I don't know if this tube has a neck weld as I have never removed the neck hardware. My standard operating procedure when decating a tube that has already had the neck hardware adjusted is to pull the tube with all neck hardware on and plop the whole thing in the bucket I use as a stand during decating(I did have to hang the convergence adjustment chassis outside the bucket on this one though). This method has resulted in not having to re-setup the tube in several sets or to only have to make minimal touch-ups.
I may be able to answer your question soon. If a couple of things I'm going to try fail to get this tube to have acceptable purity. I'm going to assume the Silver-Glo that is in there now is defective and swap in my spare Zenith 21FBP22 CRT. I've degaussed the living bleep out of it, so about all I can think of doing now is to swap the purity rings and possibly the CRT.
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