- An amplifier utilized to boost signal levels, without distorting them, to those sufficient for a power amplifier to handle them effectively. Preamplifiers are often used in processing radio, TV, audio, and microwave signals. Also spelled pre-amplifier. Its abbreviation is preamp.
- noun an amplifying circuit, e.g. in a radio or television, that is designed to strengthen very weak signals and then transmit them to a more powerful amplifier