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An example of a typical high-end stereo preamplifier.. A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. [1]
Preamp-DIs for acoustic instruments often include two channels and a simple mixer, to enable the player to use both a pickup and a condensor microphone. Some preamp-DIs provide phantom power, in case this is required to power a condenser microphone. Preamp-DI units may be battery powered, have an AC mains plug, or both.
Hybrid bass amplifier heads typically pair a tube preamplifier with a solid-state power amplifier. This provides the player with the best elements of both amplifier technology. The tube preamp gives the player the ability to obtain tube amplifier tone, which tube enthusiasts state is "warmer" than a solid state (transistor) preamp.
Most phonograph cartridges also have a low output level and require a preamp; typically, a home stereo integrated amplifier or receiver will have a special phono input. This input passes the signal through a phono preamp, which applies RIAA equalization to the signal as well as boosting it to line level.
While tube amplifiers do need to attain a proper operating temperature, if the temperature goes above this operating temperature, it may shorten the tubes' lifespan and lead to tonal inconsistencies. [2] A Trace Elliot Bonneville tube amplifier as seen from the rear view: note the vacuum tubes extending into the wooden cabinet.
An integrated amplifier (pre/main amp) is an electronic device containing an audio preamplifier and power amplifier in one unit, as opposed to separating the two. [ 1 ] [ 2 ] Most modern audio amplifiers are integrated and have several inputs for devices such as CD players , DVD players , and auxiliary sources.
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