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Use the high voltage meter to check and see if you get any voltage on the focus pin of the CRT with the socket unplugged. If there's leakage from the anode connector to the focus pin inside the CRT it can cause the focus voltage not to track with the high voltage. If you measure voltage, use a grounded clip lead and touch the focus pin, if it "pops", like discharging the anode, it may correct the problem.
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