21FJP22's get this condition because the safety glass is coming unglued from the face of the CRT. 21AXP's, CYP's, and FBP's do not use the glued on safety glass.
The tube itself can be very good electronically.
If you'll look towards the bottom of this page, this is wide discussion on cataracts. In fact, there is a photo of Rob removing the safety glass.
http://www.audiokarma.org/forums/sho...5&pagenumber=3
Yes, every now and then I can get some really good DX-ing on TV. I have seen nights in which the distant stations are almost as clear as the locals. Several years ago, I was able to pick up Corpus Christi 300 miles down the Texas coast... for an entire week! That was really somethin! In fact, at night it was causing problems for picking up the locals here. The channel 6 in Corpus was bleeding thru the channel 6 here at home. Several months back, I picked up what I believe was a station in Mexico. At first, I thought it was a Mexican station out of Houston... till I realized the call letters started with neither a K or W.