There's was ever made round picture tubes with in-line shadow mask?

[old_tv_nut]

With inline guns AND a line screen, there is no purity adjustment needed in the vertical direction - this becomes an additional degree of freedom for designing the self-converging yoke system.

The Up and Down refers to the preferred position of the blue gun in a delta tube, due to the vertical component of the earth's magnetic field. A tube designed for use in the northern hemisphere should be turned upside down for use in the southern hemisphere.