Dig out your RCA Receiving Tube handbook and look at
the TV picture
Alas over here Philips CRT dataooks are more common...
Yes, this
would worry me also. Unless you know the exact reason for how
the CRT was originally assembled, I would have though you shouldn't
change anything.
Atmospheric pressure is about 1 Kg/cm2, so the pressure on a 27 inch
CRT faceplate isn't negligible. I'd be concerned.
It's considerale even for a 12" CRT (as used in most terminals)
Assuming a 4:3 screen aspect ratio, the sides and diagonal go as a 3:4:5
triangle. So the height is 3/5*12", the width 4/5*12".
So the screen area is 3*12*4*12/(5*5) or 69.12 square inches. Atmospheric
pressure is about 14psi. So a total force on the screen of 968 or so
pounds. Since there are 2240 pounds in a ton, that['s about 0.43 of a
ton. Not inconsiderable.
-tony