It looks like Negative1 has done a transfer of the CED trilogy as well. You might find this thread interesting: http://originaltrilogy.com/forum/topic.cfm/query-converting-RF-to-RCA-video-audio-signals/topic/9710/

If you are looking at buying a CED player, then you might like to have a look at this page as well: http://www.cedmagic.com/museum/ced-player-guide/ced-player-guide.html

The specifications page mentions that some players had AV outputs as well as RF. If you were looking to buy a player, then it would probably pay to try and get a working one with RCA AV plugs as this will give you better quality than RF.

Hope this helps.