Short for Vacuum Tube, a device used to drive amplifiers until the advent of transistors. A tube works like a flood gate, except with heat. A small heater in the base warms up, while a gate like mechanism opens and closes depending on the input signal. As heat goes through the "gate", it is turned into electrical energy. Tube slots must be biased, which determines the voltages seen by the tube. Only guitar amps still use tubes (as well as some bass amps, mic preamps, and other pro audio devices.)

Though a true discussion of tubes is enough to fill a large book, let alone a short definition, but here are some more common types of tubes.

Preamp: American name (European name) Other name
12AX7 (ECC83) 7025
12AT7
12AY7

Rectifier
5U4 (GZ32)
GT5Y3 (GZ30)

Power Amp
6L6GC
6V6GC
EL84
EL34
KT66
6550
The Ampeg STV had a whopping six 6550 tubes, producing 300w @4 ohms!"
by Contraceptive SpongeBob November 30, 2005
Noun: A derisive and/or derogatory term for a Woman's vagina.
Dahveed: "Yo Emy, why'd you break-up with Jackie?"

Emy: "I was tired of banging her tube"

Dahveed: "Hey that brode is so hawt I wanna fuck her tube"
by Dahveed May 12, 2008
Television
I feel like watching the tube
by Arya F April 03, 2003
Senator Ted Stevens's vision of the internet.
The internet is not something you just dump something on. It's not a truck.

It's a series of tubes.

by Hen July 05, 2006
Idiot, innocent fool -- particularly a teenager.
Scots origin Glasgow urban slag
"See him he's a pure tube man !"
translates as "That chap is a proper fool"
by Andy MacFadyen January 21, 2004
london underground/metro/subway
fuck the tube, I have a car.
by blah December 15, 2003
What the internet is made up of.
The internet is not something that you just dump something on. It's not a big truck. It's... it's a series of tubes.
by Jimmy So August 25, 2006
Medical shorthand. Totally Unnecessary Breast Examination.
Female, 19, mild foot pain. 5ml sodium pentathol. TUBE.
by Lord Grimcock August 21, 2007

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