Purple color in CRT

[kx250rider]

That means that air has leaked in, so beware that the tube may arc when it sees high voltage. I would recommend not planning on using that tube, but on the other hand, it may have such a small leak, that it has taken 50+ years to leak to this point, and if it's going to take another 25 years before it leaks enough to arc, then obviously you're fine using it. If it's been in a damp environment, then likely the wires from the base have corroded into the glass, and have allowed a leak.

Charles

[Eric H]

Charles, this question has been gone over pretty thoroughly over at A.R.F.
http://www.antiqueradios.com/forums/...p?f=3&t=182773

The main consensus is if it checks good then it's good, the glow on the glass in normal, down inside the elements is Gassy and bad.
I've never seen a tube with purple inside the elements check good.

Some folks even think a purple glow on the surface of the glass indicates a very hard vacuum.

Jon, I'm not sure if your afraid it won't work or just looking for the Scientific answer to why it glows.

I'm quite confident it will function in your set, the Scientific answer will have to come from someone else I'm afraid.

Dammit Jim, I'm a Mechanic not a Scientist!

[ketron281989]

Jon, I'm not sure if your afraid it won't work or just looking for the Scientific answer to why it glows.



Thanks Eric your always a big help

I just wanted to know if the tube would still be good at performing, we will see when I am able to do a recap, but the fear factor that it was bad is cleared up thanks to you and the other forum members.

[stusnyder]

[QUOTE=ketron281989;302284

I just wanted to know if the tube would still be good at performing, we will see when I am able to do a recap, but the fear factor that it was bad is cleared up thanks to you and the other forum members.[/QUOTE]

Have fun with that recap, especially the ones under the tuner. The lytics in the center of the chassis, you almost have to restuff the cans, no room to mount them underneath, too crammed in the first place.