are you trying to use 2 seperate x screens? one for tv and one for crt? if thats the case, i have an XF86Config for you. my config does 3 important things:
1) puts the TV to the left of the CRT
2) screen 0.0 is the CRT, screen 0.1 is the TV
3) screen 0.1 (the TV) has the video overlay. meaning if you play back movies on that screen they won't tear. but if you playback movies on the CRT, they will tear
4) there is a bug. when you quit the x server with this config, you get a blank (or a messed up) screen where you can't see anything. input still works, and you can restart the x server just fine, but you just won't be able to see anything at the console.
hope this helps,