crt models that burn easily

zachgold · 09-11-2009, 2:59 PM

Hi,

I'm doing an art project that involves intentionally creating burns on crt screens. Can anyone recommend popular models that are likely to burn? Or should I just look for ones manufactured before a certain year? I know this is an odd questions, but any advice would be appreciated.

Thanks,
Zach

mike7 · 09-11-2009, 5:24 PM

The idea is that they don't burn !. Actually you would probably need to hold a particular picture on on the screen for hundreds of hours in order to effect a burn on the screen. In olden days (black and white) when there was not 24 hour TV the test card would often get burnt onto the screen of display models. You need a technical person to tell you how a set might be altered to 'burn', but I'm guessing this is not a safe or easy thing to do.

zachgold · 09-11-2009, 5:36 PM

Let me clarify:

I already know how to create a burn. You just adjust the color levels beyond what is broadcast safe and hold the image on their for a length of time.

The issue is that most newer CRTs are designed not to burn, so I'm wondering if anyone can recommend a particular model or if it is simply a generational issue and I should purchase one manufactured before a certain year.

mike7 · 11-11-2009, 4:02 PM

You would have to be looking a long way back. Possibly a black and white set if you can find one on a dump somewhere.

zachgold · 11-11-2009, 4:15 PM

What exactly do you mean by long way back? 20 years? 50 years?

Obviously I'm looking for a specific answer here. There is eBay nowadays...

Also, I don't think b&w vs. color has anything to do with it.

24 P · 11-11-2009, 11:06 PM

Any CRT is quite easy to burn, turn up the contrast as much as possible, over saturate the content and leave as a static image.
Any CRT will do, just use all the contrast, turn brightness down, and you should have a nice afterimage quite quickly, maybe 2 3 hrs...

zachgold · 12-11-2009, 4:12 PM

Thanks 24P!

zachgold · 02-12-2009, 12:21 AM

Update:

After 48 hours with a super-saturated still image left on the screen I see no burn.

I think this could partially have to do with the old tv I picked up from salvation army having a permanent "wobble" (for lack of a better word, I'm not sure what the technical term is) on the horizontal scanlines.

Still, I think this would only soften the image, not prevent burn entirely. From my research I think it might take as long as a few weeks to get a decent burn on a color crt.

24 P · 02-12-2009, 2:00 AM

you can try a B&W if this helps, wobble will be a sort of Plasma protection, so this might not be what you need...
If the pic moves, it will eventually give a soft burn, not a sharp image, I take it you want a static image akin to those old Railway station display burn ins, or even Horse racing venue displays...

mike7 · 02-12-2009, 7:37 AM

Quote:

Originally Posted by zachgold

Update:

After 48 hours with a super-saturated still image left on the screen I see no burn.

I think this could partially have to do with the old tv I picked up from salvation army having a permanent "wobble" (for lack of a better word, I'm not sure what the technical term is) on the horizontal scanlines.

Still, I think this would only soften the image, not prevent burn entirely. From my research I think it might take as long as a few weeks to get a decent burn on a color crt.

Just to clarify the only burn I have seen was on b&w sets a long time ago. The test card would be visible on the screen even after the set had been switched off, like a photographic image. I cannot see how you could force a modern colour screen to do this in such a short time unless you push up some voltages (dangerous to do!) and then you may risk the tube failing altogether.