Another 621

[M3-SRT8]

Originally Posted by decojoe67

Through the years I've noticed what appears to aftermarket masks that make a "double-D" out of the old rectangular masks of '46-'48. They just look too cleanly done to be home-brews. Maybe even some repair shops offered this customization (?)

Yeah, but I don't get the advantage. Don't you lose screen area in the corners with a double D mask? It's not like you're going to have focus problems on a 7" CRT.