21FBP22A/21FGUP22 Sylvania Rebuilt C.R.T.

[Tubejunke]

My 1964 Zenith has this rebuilt 21FBP22A/21FGUP22 (never heard of the latter number) tube in it and I am first wondering how it compares to the 21FJP22 and what difference there is. The Sam's folder shows a footnote on mine that says, "Use insulating sleeve and mounting wafer." Not sure what that means. Perhaps some insulation provision due to the metal cabinet.

Also I am wondering if it has the bonded faceplate or the type that the tube just sits down on and there is no bond. Reason being, someone in my home was nice enough to put about a 4" long and rather deep scratch right smack in the middle of the viewing area. The tube (if bonded) has absolutely no cataracts and I wonder if I could simply remove the faceplate in the future to eliminate the nasty scratch. I know either type can be removed, but I would rather lift the tube off of a faceplate than go through the trouble of removing the bonded type.

I guess the easy way out is of course to deal with the scratch and move on without and unnecessary tube removal. More safe too for reckless individuals who gouge TV tubes!