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before you invest in a new flyback, you need to see what the HO cathode current is set at. if its excessive (over 200ma) then the flyback will burn up. I will usually run it at about 170 - 195, just enough for the Ho tube to conduct properly. Keeping that flyback cool is the secret to keeping it alive. The fly also shouldn't affect the raster grayscale either. You could have a gassy CRT or have a short in one of the guns.
If the vertical and horizontal were wonky that would suggest a power supply problem. I would have re-capped the power supply and check the HO cathode current as soon as I knew the set was working.
Leaving the old electrolytic caps in there is only asking for trouble. I would test the HO tube and damper. Make sure there is no grid leakage on either tube.
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Jordan
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