>>714208276
Patents have all run out and the documentation is in theory there for the taking. Main problem is CRTs were made in the analog era and required a lot of manual labor.
A quality CRT is in a sense a fine tuned instrument. To build up the required experience and knowledge to begin producing these displays again would take a very long time and be unreasonably expensive.
The only way a technological marvel like the sony trinitron CRT is possible to sell at consumer prices is purely with the help of economy of scale.