What would really make this interesting is if we would use only tubes in current production, wherever possible. I understand that some tubes, like HV rectifiers, would be impossible to find.
But there are many tubes in production for audio use that would work in video circuits, and were used in TV sets in the past. EF86 pentodes, 12bh7's, 6FQ7's, big tetrodes like 6L6GC's or 6550's as Horizontal output tubes, etc...
These links are just an example of the variety of tubes in production today.
http://www.tubedepot.com/elha.html
http://www.tubedepot.com/jjtesla.html
http://www.tubedepot.com/sino.html
http://www.tubedepot.com/sovtek.html