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yea you should see the 6Bk4 glow all the time, just brighter when there is less beam current thru the CRT (dark scenes), should be clearly visable glow near the base of the tube. The 6EL4 from what I understand is just more X-ray shielded, leaded glass perhaps. I routinely replace some of the large ceramic tube caps in the vert circuit of zenith, .1 1kv I think. My cap tester only goes to 450v so I cant really test them well. They are prob ok, but I change them anyway. like the other poster said, often there are a lot of minor problems, just need to work them one at a time.
Make sure your pic is centered, do this in the setup mode to see where the horz line is. then you can adj the V heigh and V lin. get that and the purity all squared away before touching the convergence.
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