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Sorry, I see your post that you tested the tube. What kind of tester did you use.
If I remember right, the red drive is set at full and the green and blue are brought up to match it from minimum. Are the screen controls adjusted properly? Both of my sets are fairly critical on focus and start losing it if set too high. If possible, also check your high voltage. Usually, if the 6BK4 goes bad it goes way too high. I have seen chassis trouble make the 6BK4 pull down the high voltage. If the voltage is too low focus suffers first then width.
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