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Sometimes the focus rect tube will test good but not work well. I tend to parallel a modern 5KV diode across the focus rect tube as an early troubleshooting check/long term fix.
A few things to watch out for in focus circuits. Corrosion inside the CRT socket and or bad contact between socket and CRT, the 66M resistor, the 6KV ceramic cap on the focus coil can have issues...The collector that reported it had an tuning eye type cap checker and said it didn't fully open the eye on the capacitance test.
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