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Just a quick note that if you do replace the CRT, be sure to discharge the anode or you are likely to get a nasty shock and possibly end up dropping the CRT....not a pretty sight. Typically you would only need to do this once, but I have heard of CRT's building up a charge a few times after the initial discharge.
I had a 25BP22A that I picked up and rested it on my stomach as I was carrying it, unfortunately the anode end was toward my stomach and I got zapped right through my shirt. It is a wonder I didn't drop the CRT. I probably would have dropped it if I didn't have a thick shirt on.
Be very careful with handling the CRT. While they are relatively sturdy when in place, they are quite fragile and are under a great deal of pressure.
Changing a CRT is relatively easy, just please be careful and observe proper safety precautions and try not to rush.
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