An Emerson with a 19AP4??

[Eric H]

Short of breaking one open and checking how would you know if a metal cone tube was Aluminized?

You can tell on a glass tube because you can see it from the back side, no such luck on a metal tube.

[John Marinello]

Originally Posted by Eric H

Short of breaking one open and checking how would you know if a metal cone tube was Aluminized?

You can tell on a glass tube because you can see it from the back side, no such luck on a metal tube.

With an image on the screen, you can tell by looking down the neck of the tube. On tubes that weren't aluminized, you will be able to see the screen image reflecting off the gun assembly. At just the right angle, you can usually see all the way to the screen.