What is tubes instrument?

A tube instrument, also known as a vacuum tube or valve instrument, uses vacuum tubes to amplify electrical signals and generate sound. These instruments were used primarily in the early 20th century before the development of solid-state electronics. Tube instruments include guitar amplifiers, microphones, radios, and amplifiers for musical instruments such as the theremin. The use of tubes in instrument amplification creates a warmer, more vintage sound due to the natural distortion and compression that occurs in the tube circuitry. However, these instruments require more maintenance and are often more expensive than their solid-state counterparts.