see

http://bs.cyty.com/menschen/e-etzold/archiv/TV/pye/img/Ionenfleck.jpg

Who has some more photos of ion burns on the screen?

- Eckhard

Yikes! :yikes:

That is scary. The phosphor looks almost completely gone!

Yikes! :yikes:

That is scary. The phosphor looks almost completely gone!

It is not as bad as you think. This photo was enriched with contrast to make it more visible. I have created a Wikipedia article with an actual ion burn photo (with normal contrast):

http://de.wikipedia.org/wiki/Ionenfleck

But with moving images you don't see the ion burn after a while. See this photo from the same tv set:

http://bs.cyty.com/menschen/e-etzold/archiv/TV/pye/img/LV30.jpg

Who can make more photos from ion burns on the screen? I want to compare these to see whether they look similar or not.

- Eckhard

I have a worn-out Zenith 10BP4 with obvious spotchiness of the phosphor. It isn't concentrated in the center like the one pictured, though. If not ion burn I'm not sure just what it is. It's stuffed way back in the attic but sometime I'll pull it out and get a picture.

I've seen a couple CRT's with phosphor that flaked off , not related to Ion burns. I am not sure if that is the spotchiness you are refering to. I have a Dumont 15AP4 that is missing a speck.



-
Matt Davala

I had a Zenith with a spot burnt right through in the center, where the turn-off dot generally is.

I had a rotted tube in a tek scope once that I pinned the brightness on and XY drew by burning off the phosphor. I wasn't the first one to try that 'experiment' on it, either. Tek sold a kit to internally limit the brightness, for just such a reason...

I wonder where the stuff goes, after that, though?