After the flyback, I had problems with badly scratched
picture tubes,
and dead tubes. I still don't know how they could scratch them up so
badly.
Easy. Pinheads would put any CRTs face down on any dirty floor or
pavement and grind it around. Just a slight move same thing. Even
two CRTs facing each other and touching while jousling either one
have same effect.
Cheers,
Wizard