Good day.
The problem with your unit is that when your tube was replaced, it was not degaussed or demagnitized. The purpose of such is to distribute the color evenly unto the entire television matrix.
You can try to demagnetized it by rotating a magnet around the surface( but not so near) of the picture tube while it is operating.
Also, please check for the degaussing coil around the rear portion of the tube was returned and also check for loose contacts.
chris
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