Amp Types: Amplifier (aka The Head)

Images for this post taken from http://www.samedaymusic.com/

Although we use the word amplifier (or amp) as an all encompassing word for the units which produce the sound of a guitar, it actually refers to the unit which amplifies the signal.
An amplifier consists of a preamp and a poweramp. A preamp to recieve a low level signal like a guitar signal, and the poweramp to power the preamp signal so it can drive speakers.

When the amplifier is on its own, it is usually referred to as ‘The Head’. Here are images of some amp heads.