Audio power amplifier
Videos
An audio power amplifier amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or
Audio stereo power amplifier made by McIntosh
The internal view of a Mission Cyrus One hi-fi integrated amplifier (1984)
De Forest's prototype audio amplifier of 1914
McIntosh MC240 from 1961, with exposed vacuum tubes
Preamplifier
Videos
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 process
Audio power amplifier
…chain before the signal is sent to the loudspeakers. The preceding stages in such a chain are low-power audio amplifiers, which perform tasks like pre-amplification of the signal, equalization, mixing different input signals. The inputs can also be any number of audio sources like record players, CD players, digital…
An example of a typical high-end stereo preamplifier