Where to get picture tubes?

[Eric H]

Originally Posted by Electronic M

Not really. The metal part only goes from the face to the vertical line between the 27" radius and 54 degree markings from there back to the neck it is all glass and an insulator would be unneeded on that glass part.

I meant that the insulator would go around the face of the tube, like the Zenith Portholes that have the thick plastic spacer/insulator around the screen to keep the bezel from becoming electrified.
You can see one in this picture, it pushes the CRT backwards just about the right amount.