Guitar amplifier

A guitar amplifier is an instrument amplifier designed for use with an electric guitar, electric bass guitar, or acoustic-electric guitar. An amplifier receives an electric guitar's pickup-generated signal and shapes that signal's tone through a preamplifier and amplifies it through a power amplifier; it is then projected through loudspeakers. When the preamp and power amp circuits are combined with one or more loudspeakers in a single enclosure, it is known as a combo.

When the preamp and power amp are housed together for use with an external speaker cabinet, it is known as a head.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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