Quote - I'm not defensive, but I know how kawecki behaves and I know what happens in this forum when somebody, confused by incomplete knowledge, starts a showdown with me, about the f***ing math.

If you want to learn something about cathode ray tubes (CRT) I recomend you the book "Cathode Arcs" by Andre Anders. Is good to read some serious technical books instead of repeating what someone put in some site in the internet icluding Wikipedia, even has its merits, is only one more site where anyone can write what he wants. And if maths are not your baby is good to learn them too, because without maths you go nowhere in technical subjects.

Stupidity also evolves!