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Check the G2 voltage from the flyback and make sure it varies as you adjust the control. If it does not, you have a bad flyback or you might have possibly forgot to solder the G2/focus ground lug on the underside of the flyback to the PC board.
If that checks out, measure the B+ voltage to the video output stages. It should probably be at least 200 V. If not, suspect an open resistor or a bad cap in the B+ line.
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