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not able to adjust contrast, look for that wire coming off the contrast pot that goes to one of the sections of a can, 100uf 50v or something like that. Disconnect that, you should lose most of the luma content (looks like very low contrast). then try hooking a good 100uf cap to that wire (pos, neg to ground), see if that fixes the contrast control.
Tube testers are not much good but for testing short/grid emissions/and totally dead tubes. Don't put much faith in them, better to do tube subs with known working tubes.
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