20" round tube DuMont on the 'bay

[jeyurkon]

Originally Posted by Tom Albrecht

That's probably a matter of taste. I'll probably go with aluminized, but one could presumably have the option to choose no aluminization and bent gun for more historical authenticity.

Or, you could go for aluminization and bent gun. Some other CRTs were done that way for increased brightness, such as the 12LP4C. It still required a double field magnet.

The lower cathode current might mean longer life. Especially for a larger CRT like the 20BP4. Given the expense of rebuilding one that might be desirable.

John

*** Oops! Chuck pointed out that the 20BP4 is a straight gun to begin with. ***

[ChuckA]

Originally Posted by Tom Albrecht

That's probably a matter of taste. I'll probably go with aluminized, but one could presumably have the option to choose no aluminization and bent gun for more historical authenticity.

Tom,

20BP4 is a straight gun, it's a screen burner. All of mine show ion burns on the screens.

Chuck

[Tom Albrecht]

Mine has a big blast spot of missing phosphor in the center, so I think I never had an opportunity to notice the ion burn!

Aluminized sounds like the way to go.