Quote:
Originally Posted by old_tv_nut
A thought: is it possible this set is intended to have some anti-pincushion magnets or pole pieces that are missing?
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The fixed anti pincushion magnets only appeared with the later wide deflection angle CRTs in the 1960s. I recall seeing them on later sets.
The 70 degree tubes like the 16GP4 generally did not suffer from pincushioning or raster distion unless there was a strong external magnetic field nearby.
My guess it is a magnetized cone are the corner distortions as the beam reaches a sweep extremity.