There is no curve on the inside at so called real flat
CRT's. In modern sets the katodes are in line, so
no electrical convergenz is neccesary. Of course you
can adjust convergenz with magnets. I have no
favorite color TV, but I don't like the 100Hz picture.
Digital picture is good, but only if nothing moves.
It is a bad thing that they pick up digital pictures
for analog transmitters.
Darius