[old_tv_nut]

This tube has a white field purity problem in the lower left that I have not been able to adjust out. The pure R,G,B fields don't look so bad. White field purity issues were fixed by the invention of negative guardband tubes, where the shadowmask holes are larger than the phosphor dots (which are then masked by black surround).
This is a GE-branded rebuild, and I have vague suspicions that the guns may be rotated a tad.