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I checked the hv last night. Previously I had set it with a VTVM but I have now rigged up a spare hv probe to work with my digital multimeter. I am averaging 25,600v. I cannot adjust it any lower. When I tried it last night it took longer than usual for the focus problem to show itself, long enough that I thought maybe it was just an intermittent. But it did finally go slowly to a blur-and while this was happening the hv did not change. I also measured hv while varying the focus control-no difference. No visible problems in the crt neck; I pulled the socket but the focus pin looks okay. I haven' t decided what to try next. At some point I guess I should find out why the hv is on the high side; I'm in no hurry to pull the chassis.
While I am at it...where (physically) is the jumper for measuring hv current? The chassis design on these is very thoughtful, I thought it would be marked & on top of the chassis but I see nothing. Sams makes reference to it in the schematic & the setup page but does not show it. I have to admit that I have never done this before but the other thread on here has been discussing it & I do think the flyback gets too warm on this Zenith. I don't think there is any connection between this & the focus...
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Bryan
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