Instrument amplifier
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An instrument amplifier is an electronic amplifier that converts the often barely audible or purely electronic signal of a musical instrument into a larger electronic signal to feed to a loudspeaker.
A Fender combo amplifier. The combination amplifier is a preamplifier, power amplifier and tone controls and one or more loudspeakers or drivers mounted in a portable wooden cabinet. This amp's sound is being picked up with a microphone in a recording studio.
A Vox AC30 guitar amplifier used by The Beatles
A small Gibson combo amplifier.
A 3×6 stack of mock Marshall guitar cabinets for Jeff Hanneman of Slayer
Audio power amplifier
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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
Instrument amplifier
…instruments and some keyboards) or other sound source (e.g, a synthesizer's signal) into an electronic signal that has enough power, produced by a power amplifier, to drive one or more loudspeaker that can be heard by the performers and audience. Combination (combo) amplifiers include a preamplifier, a power…
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