Electronic switching and amplifying system inside a glass tube. Pre-solid state. Requires huge amounts of power, generates beaucoup heat, takes up lots of space. Fails regularly. Over 2,000 of them in a Nike Set.
The connecting tube in a milking machine between a milk receiving bucket and the air pipeline. Valuation(a) The process of attributing value to a specific item for a specific reason. A number of alternative methods are possible.
Also known as "Vacuum Valves." It is an electron tube from where all air and gas has been evacuated. It was previously used in radio and electronics.
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
a hollow glass cylinder from which as much air as possible has been removed
an electron tube from which all or most of the gas has
an evacuated glass bulb, containing a metallic cathode (heater) that gives off electrons when hot and an anode (plate), that collecting electrons when it is made positive
a sealed glass bulb containing a cathode and an anode which transmit and receive electrical currents
a valve, as our British brothers say
A device with electrodes in an evacuated glass tube for the control of current flows in an electric circuit. Used for the construction of early logic gates.
A multi-electrode valve which controls the flow of electrons in a vacuum from electrode to electrode. It is based on a principle known as thermionic electron emission. A common use is for signal amplification. While not often found in modern electronics, certain audio manufacturers produce high quality components utilizing these devices.
An tube with no air inside of it. (See electron tube.)
a tube contaning a low pressure gas and two or more metal plates that control the flow of electrons.
Also known as thermionic valves. Similar in appearance to a light bulb, they have a filament that, when heated, releases electrons into the vacuum. Used in amplifiers, they are becoming increasingly rare
An amplifying device that is a tube.
Sealed container, usually glass, with all the air taken out (creating a vacuum) and two electrodes placed at opposite ends of the container from which electrons can flow (electrons flow freely in the vacuum environment with no air present).
Electron tube evacuated to such a degree that its electrical characteristics are essentially unaffected by the presence of residual gas or vapor. Have been essentially replaced by transistors for amplification and rectification. Cathode ray tubes are still used as display devices.
In electronics, a vacuum tube or (outside North America) thermionic valve or just valve, is a device generally used to amplify, switch or otherwise modify, a signal by controlling the movement of electrons in an evacuated space.