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Charlie:
I would reduce the width to about 1/2 to 3/4 inch overscan on the sides. Make sure the 6500 ohm, 7 watt 6DQ6 screen resistor is not shorted. Other than that I would not attempt to reduce the high voltage.
Measuring high voltage did not come into fashion until it was mandatory for color TV so service personnel rarely knew what it was or were concerned with it.
Anything creative you do to lower the high voltage will either reduce width or load the flyback. Both should be avoided.
Don
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