Roundie picture tube - What wrong with this? Rot? Mold? Delamination?

[lekkerbekkie]

Hi, Just joined the forum and I'm catching the restoration bug. I inherited a CTC20C with a 21FJP22A picture tube (weird combo, seems like a new design married to an older picture tube).

This TV is dead (has 9 bad tubes), but before I start investing in it, I'd like to find out if the picture tube is a lost cause. It has a strange mold-like defect around the perimeter (See pics). I tried searching the forum, but could not find a similar defect. Is this de-lamination of the safety glass? What causes this? Is it fixable or would I need a new 21FJP22A?


STA60052.jpg

STA60053.jpg

Thanks!
Eric