A preamplifier (preamp) is an electronic amplifier that prepares a small electrical signal for further amplification or processing. A preamplifier is often placed close to the sensor to reduce the effects of noise and interference. It is used to boost the signal strength to drive the cable to the main instrument without significantly degrading the...
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http://en.wikipedia.org/wiki/Preamplifier
amplifier located before a main amplifier or an amplifying chain, generally to provide it with a signal of sufficient power level or to obtain the highest possible overall signal-to-noise ratio NOTE - A preamplifier often takes the form of a low-noise amplifier located as near as possible to an antenna or another signal source.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=713-10-45
This is usually referred to as preamp and is a device that takes a source signal, such as from a turntable, tape deck or CD player, and passes this signal at line level on to a power-amplifier. The preamplifier may have a number of controls such as source selector switches, balance, volume and possibly tone controls. This is typically the large...
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A control and switching component that may include equalization functions. The preamp comes in the signal chain before the amplifiers.
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An electronic device that boosts extremely weak signal voltages, such as those from microphones or mag heads, to a level that is usable by power amplifiers. (Electronics)
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http://www.filmland.com/glossary/Dictionary.html#A
A preamplifier, also referred to as a preamp, is an electronic device used to adapt a signal for augmentation. The instrument is most commonly situated next to a sensor during testing to lessen the effects of distortion caused by interference and superfluous noise. Used to boost the strength of the signal, the preamplifier's primary objective is to...
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An electronic amplifier that prepares a small electrical signal for further amplification or processing
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preamplifier 1. An electronic circuit or device that detects and strengthens weak signals, as from a radio receiver, for subsequent, more powerful amplification stages. 2. An amplifying circuit; for example, as in a radio or television, that is designed to strengthen very weak signals and then transmit them to a more powerful amplifier.
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a device in the amplifier circuit of a radio or phonograph that increases the strength of a weak signal for detection and further amplification.
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https://www.infoplease.com/dictionary/preamplifier
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