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The HV probe could be somewhat inaccurate. None the less it is a good bet the HV in the set is too low.
Could be that the HV is being loaded down by leakage.
However the other voltages in the horizontal sweep circuit should be checked.
Try disconnecting the HV lead at the CRT and insulate it by putting the end in a jar. Then measure the voltage on the doorknob cap.
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