CRT RPTVs require quite a bit of maintenance and cleaning, including reconvergence, and tend to have geometry and viewing angle problems. Yes, I know, some swear otherwise. And replacing the "guns" is probably cost prohibitive, when they fade, since there are 3 highly driven CRTs in each CRT RPTV, not just lamps/light bulbs. Other RPTVs have lamps rated for around 4,000 to 8,000 hours. My 61" JVC is rated at 6,000 hours and I'm about to buy a spare to keep on hand for $230.
Some will declare CRT RPTVs have the best PQ. Doubtful, since they are fading from the market. Oh yeah, that's due to a conspiracy to make more profit, etc etc
CRT RPTVs are almost off the market, and sold because they were cheap, for the most part. 9" guns from folks like Mits were good, but perhaps not quite as good as some would like to believe. Only the 9" guns could actually produce 1920x1080- the more common 7" guns were limited to more like 1440x1080. Now that you can get a microdisplay RPTV for not much more than a CRT RPTV, there's little reason for the CRT RPTV to exist.
Direct view CRTs are probably the best PQ. But I think the largest you can easily buy today is 32". I think the 36 inchers are all but gone from the market. So if you want a large screen, you won't be looking at direct view CRTs. This year we will see even the direct view CRTs start to disappear from store shelves, replaced by flat screen technologies.
LOTS of discussion on this at AVS. More than you want to know, liberally coated with heated emotions.