electron gun

The electrons get reused. The shoot out of the gun accelerated by a high positive potential circa kilovolts. Ultimately they slow down and wander back to the negative side of the accelerating power supply which is near zero potential.

Bill

-- Ferme le Bush

i worry about more important issues like: why were there no rainbows before the great flood?

The little electron fairy goes to the ammo store and buys a case of full metal jacket electrons, brings 'em back, loads up the clip and slaps it back into the electron gun.

conservation of charge, but I like the fairy explaination better!

How do you know?

Bill

-- Ferme le Bush

i read it on the internet! :)

Electrons are made of dark. The electron gun is pointed at the screen of the CRT, which is actually a modified darksucker capable of displaying images. When you turn off the CRT, the dark is recycled back from the screen to the gun.

You'll notice on old CRTs that never get turned off that you can see the image on the CRT even if you do eventually turn it off. This is because the dark is stuck and can't get back to the electron gun. It takes a while for the dark to get back to the gun. Less effecient crts will show a small bright dot in the center after they're turned off, before all the dark is recycled.

The newer CRTs have a special accelerated-dark-recycling (ADR) circuit built in, and you usually don't see that bright dot. This is how they are qualified for the energystar rating. You will never see a legitimate energy star rating on a crt that shows this small dot shortly after being turned off. If you do, that means that either the ADR circuit has failed or the energystar logo on the CRT is a fake.

LCD and TFT m> Why doesn't an electron gun in a CRT tube run out of electrons?

You guys almost have it, but the real reason is that the electrons are supplied by tv stations and websites. There is a top secret super minature flexiable not corroding ansi approved fibre glass optic nerve thing-a-ma-jig that runs inside the power cable and connects to an identical but different thing-a-ma-jiggy in the wall outlet. This has been going on ever since before the war. (The big one). It is still top secret stuff, just in case another cold war breaks out. This is also why tv stations charge for their services. Where you dont have cable tv, the electrons arrive in the form of disquised air molecules. How do I know this highly classified stuff? Well, I invented it. I also won a nobel peace prize for it. It was in all the papers, then this guy name of Albert something came up with the idea of time travel. He traveled back in time and entered his idea before I could mine, thusly beating me to the coveted nobel prize. So all mention of me getting it was wiped away. But alas, I still have the nobel prize plaque hanging on my wall right up there... DOH!!! It's gone! That dogone Albert, he mustve time traveled into the future, read this post, then back time traveled and stole the plaque off my wall while I was out getting diet pepsi!!! One of these days!!!

In a sense, they do, but it takes a long time.

The electrons are emitted from a part of the gun called the cathode, which is a nickel sleeve coated with various metal oxides. After many thousands of hours of service, this oxide layer starts to lose its ability to emit electrons, and this loss of emission causes a dim, poorly focused image on the screen.

Most modern TVs or monitors end up in landfills for other reasons well before the CRT gets worn out, though.

Bob Weiss N2IXK

Sounds like an application for Viagra.

Bill

-- Ferme le Bush

Proteus, why didn you correct it all da way., it still soundz a part of a lil off.

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