Main Page | See live article | Alphabetical index A preamplifier (preamp), as its name suggests, is an amplifier which precedes another amplifier. The second amplifier is typically a power amplifier (power amp). In this example, the job of the preamp is to amplify a low level signal, perhaps from a microphone or pickup, to line level and to apply any necessary equalization and tone control. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.