General CRT question (sony trinitron)

[AgentWinchester]

This is not a "help me fix my monitor" thread. This is on a computer monitor, but is a general CRT question involving the way one works. I appologize if this doesn't belong here.

I just bought a Dell Ultrascan P991 (sony manufactured trinitron type flatscreen CRT) on a thrift store run. Picture's great, but blurry in some areas, and text ghosts to the right. Using the Convergence control in the menu, I got it looking moderately OK.

While shutting down a Knoppix LiveCD session, I noticed the problem. Some blue was peeking out from behind a string of pink text at the bottom of the screen, so I adjusted the convergence accordingly. Then I noticed that the pink text at the top off the screen was WAY off. In windows, when i fix the top of the screen, the lower half goes blurry (varied, kind of gradient from center to bottom)

So, it would appear that there is a convergence problem with the hardware, leaving discrepancies in different areas of the screen, and no front panel tweaking can fix this. Now, here is my question: Could this be a component or circuit problem, or a terminal problem with the tube? I know certain products from this era are notorious for bad capacitors, but i haven't heard anything about monitors. I've degaussed it about seven times already, too.

Many thanks for any info.