Roundies (top & bottom of screen covered)

[Chad Hauris]

Yes, I think they wanted to make the picture appear as rectangular as possible...also the mask around the round tube is often painted the same color as the tube (when off) to further try to disguise the roundness of the screen.

There are some b/w sets where the mask is actually totally rectangular over a round tube...cropping the sides as well as the top and bottom.