Quote - his page discusses the CRT math, including the increased mass of these very fast electrons.http://www.antonine-education.co.uk/physics_a2/options/Module_8/Topic_1/topic_1.htm
also here:

http://www.exo.net/~pauld/activities/physics/relativitytelevision.htm

What are you going to do? create an assassin TV set ?

Did you know that electrons traveling at very high speed have high energy and what does happen when a high energy hits a target? It produce X Rays, higher the energy harder the X rays. You are making a X ray generator and not a Television CRT tube !!!!

PS1- Who was right and who was wrong, Einstein or Heisenberg ? Forget Tesla, he was crazy.

PS2- My new LED monitor has three gammas: gamma1, gamm2 and gamma3, which one is the right one ?

Stupidity also evolves!