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tube
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    Also found in: Dictionary/thesaurus, Medical, Idioms, Encyclopedia, Wikipedia 0.03 sec.

tube

Or electron tube in electronics, a glass tube containing gas at low pressure, which is used to control the flow of electricity in a circuit. The electron tube valve was invented by US radio engineer Lee de Forest (1873–1961). Three or more metal electrodes are inset into the tube. By varying the voltage on one of them, called the grid electrode, the current through the tube can be controlled, and the tube can act as an amplifier.

Tubes have been replaced for most applications by transistors. However, they are still used in high-power transmitters and amplifiers, and in some hi-fi systems.



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It's the same old Clippers going down the tubes,' '' Brand said.
MEDIOCRITY IS NO LONGER AN OPTION: IT'S A NEW DAY IN CLIPPERLAND by Daily News (Los Angeles, CA)
Their whole presidency was going down the tubes because of the war in Iraq and all these other issues, so they just said, "OK, we're going to ratchet up the hatemongers, divert attention to the Federal Marriage Amendment, hide Mary Cheney, and we'll get by that way.
Heavy hitter: with a new book of collected essays, activist, author, ... by Ehrenstein, David / The Advocate (The national gay & lesbian newsmagazine)
We are facing a situation where all of those years of progress in the Middle East are essentially going down the tubes," one diplomat declared.
The International Quartet: tuning up for peace. (Special Report) by Curtiss, Richard H. / Washington Report on Middle East Affairs
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