A guitar amplifier takes the electrical signal from an electric guitar and increases it to a level that can drive a speaker, producing audible sound. Amplifiers are available in tube, solid-state, and hybrid configurations, each with distinct tonal characteristics and maintenance requirements. Tube amplifiers are known for their warm, responsive feel, while solid-state models tend to offer reliability and consistency. A guitar amplifier also shapes tone through built-in equalization controls and sometimes built-in effects. Wattage, speaker size, and cabinet design all influence how an amplifier performs in different playing environments.