The term “amplifier” or simply “amp” is now used not only to mean any device that increases the signal’s breadth of range. Its modern usage is primarily to refer to an electronic amplifier used in microcomputers, hi-fi stereos, television and radio transmitters and receivers, electronic digital equipments and instruments for audio applications, such as guitar amplifiers.

Buying an amplifier therefore requires one to determine what you are using it for. Another factor to be considered is the amplifier’s efficiency, meaning, its ability to convert power input to output. Amplifiers can fall under categories that range from Class A to Class D, with Class D being most efficient and Class A being the least. And like all other technologies, the compatibility of the amplifier to where you intend to use it is the key factor.
If you’ve ever attended a rock concert, it’s very likely that you’ve spent the rest of that night or even the following day nursing your ringing ears. The level of noise that concert goers experience at these events is created with the help of a series of industrial guitar amps. These electronic amplifiers enhance the level of noise produced by both electric and acoustic guitars, and their use first became widely popular in the 1940s.