Talk:Cathode-ray tube

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Article milestones
Date	Process	Result
June 12, 2007	Good article nominee	Not listed

Electronics High‑importance

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Older Comments

since someones mentioned not messing with a CRT, should it be mentioned that one should short the large capacitors to avoid a shock

I've just added:

These high voltages can persist long after the device containg the CRT has been switched off.

In general, the untrained shouldn't be opening the box in the first place, and providing warnings is better than providing "how-to" details: where do you stop?

To do:

phosphor metamerism
color gamut

The line "CRT is a triode. More complex CRTs contain greater numbers of electrodes. " was deleted. Primarily, this makes no sense logically, and also, triodes were mentioned later.

Sounds good to me, welcome to Wikipedia. -- Tim Starling 07:47, Jan 5, 2004 (UTC)

CRT illustrations made especially for Wikipedia

Hi - danish wikipedian here.
For some snazzy illustrations, check out the danish article (language: "Dansk") on the subject: I just rendered some "cut-away" images of various CRTs...

User:Peo on danish Wikipedia

... and now I've moved large versions of those illustrations onto Commons. See:

User:Peo, from danish Wikipedia - again!

How many joules are in the capacitors? lysdexia 22:18, 19 Oct 2004 (UTC)

"...children should even be encouraged to do this so that they may see the immediate and dramatic effect of a magnetic field on moving charged particles, provided they are informed to never do the same with a color tube."

TEACHER: So remember, kids, never put a magnet near your TV or you'll mess up the screen.

JOHNNY (THINKS): Gee, that's great! If I mess up our crappy old TV Dad'll have to get a new one! Lee M 01:59, 2 Dec 2004 (UTC)

---

I wonder if *THAT* is what happened to my crappy old 13" TV? :)

Seriously, the Exploratorium has a color TV and a huge magnet set up for just this sort of playing around.

Meanwhile, [[User::lysdexia]] asks about how many joules are stored. Well, Joules = KV^2 * uF, so lets take a SWAG and call the CRT 0.01 uF. Meanwhile, the charge on the CRT can be 25 to 30 KV on a modern color CRT so we can calculate 6.25 to 9.00 Joules based on our SWAG about the capacitance. Having been on the receiving end of a 17KV discharge from an old B/W CRT (never grab the 1B3GT by the bottom; you might contact the HT pins!), I say that sounds like it's in the right ballpark. The shock wasn't too bad, but I really hurt my elbow when it smashed into the wall behind the TV set.

Atlant

Additional environmental content

I've removed the content below from Digital television as CRT to flat-panel transition is separable from the transition from analog to digital transmission. I'll try to return and work this material into Cathode-ray tube § Health concerns and Cathode-ray tube § Recycling but if anyone else wants to take this on before I get to it, have at it! ~Kvng (talk) 16:26, 16 March 2024 (UTC)[reply]

According to one campaign group, a CRT computer monitor or TV contains an average of 8 pounds (3.6 kg) of lead.^[1] According to another source, the lead in glass of a CRT varies from 1.08 lb to 11.28 lb, depending on screen size and type, but the lead is in the form of "stable and immobile" lead oxide mixed into the glass.^[2] It is claimed that the lead can have long-term negative effects on the environment if dumped as landfill.^[3] However, the glass envelope can be recycled at suitably equipped facilities.^[4] Other portions of the receiver may be subject to disposal as hazardous material.

Local restrictions on disposal of these materials vary widely; in some cases second-hand stores have refused to accept working color television receivers for resale due to the increasing costs of disposing of unsold TVs. Those thrift stores which are still accepting donated TVs have reported significant increases in good-condition working used television receivers abandoned by viewers who often expect them not to work after digital transition.^[5]

References

^ Campaigners highlight 'toxic TVs', Maggie Shiels, BBC News, 9 January 2009
^ "Lead in Cathode Ray Tubes (CRTs) Information Sheet**" (PDF). Electronic Industries Alliance. 2001-11-30. p. 1. Archived from the original (PDF) on 2011-05-20. Retrieved 2009-09-29.
^ Poon, C.S. (2008). "Management of CRT glass from discarded computer monitors and TV sets". Waste Management. 28 (9): 1499. Bibcode:2008WaMan..28.1499P. doi:10.1016/j.wasman.2008.06.001. hdl:10397/24493. PMID 18571917. Retrieved 2009-09-29. number of studies have demonstrated that the neck and funnel glasses of CRT are hazardous wastes, while the panel glass exhibits little toxicity.
^ What To Do With Your Old TV's, Mike Webster, WCSH-TV, January 28, 2009 - dead link
^ Many people throwing out perfectly good TVs over digital confusion Archived 2009-01-23 at the Wayback Machine, Daniel Vasquez, Sun-Sentinel, Florida, January 19, 2009

CRT TVs were popular until the late 2000s Beyond the United States and the last commercials for new CRT TV models were between 2007 and 2008.

CRT TVs known as tube TVs were popular around the world in general until the end of the 2000s because until the end of the 2000s in several countries CRT TVs were still selling a lot in stores because there was still great demand. They only began to be replaced slowly since the mid-2000s but were only completely replaced in the early 2010s when they lost popularity worldwide in general. Eusouwikipede2001 (talk) 18:48, 29 May 2024 (UTC)[reply]

Cathode current seems off

"...while at the same time current is supplied to the cathode; typically anywhere from 140 mA at 1.5 V to 600 mA at 6.3 V."

Implies there's ~100s of mA applied to the cathode. The source this sentence cites implies the same. This is certainly the the heater voltage/current (e.g. 5CP1 datasheet [1]), however. Is it possible to rephrase this? MyIpIsLocalhost (talk) 03:32, 23 December 2024 (UTC)[reply]

[1] Campaigners highlight 'toxic TVs', Maggie Shiels, BBC News, 9 January 2009

[2] "Lead in Cathode Ray Tubes (CRTs) Information Sheet**" (PDF). Electronic Industries Alliance. 2001-11-30. p. 1. Archived from the original (PDF) on 2011-05-20. Retrieved 2009-09-29.

[3] Poon, C.S. (2008). "Management of CRT glass from discarded computer monitors and TV sets". Waste Management. 28 (9): 1499. Bibcode:2008WaMan..28.1499P. doi:10.1016/j.wasman.2008.06.001. hdl:10397/24493. PMID 18571917. Retrieved 2009-09-29. number of studies have demonstrated that the neck and funnel glasses of CRT are hazardous wastes, while the panel glass exhibits little toxicity.

[4] What To Do With Your Old TV's, Mike Webster, WCSH-TV, January 28, 2009 - dead link

[5] Many people throwing out perfectly good TVs over digital confusion Archived 2009-01-23 at the Wayback Machine, Daniel Vasquez, Sun-Sentinel, Florida, January 19, 2009

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