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The Wagner tuba is a narrow-bore tuba with a French-horn mouthpiece. Tubas appeared first in Berlin in the 1820s, soon after the invention of the valve. They were soon accepted into the band and orchestra, displacing the serpent, ophicleide, and other such instruments of poorer tone quality and intonation.
Tuba. A tuba is a brass instrument characterized by its large size and deep sound. It consists of vertically coiled tubing, three or four valves, a wide conical bore, flared bell, and a cup-shaped mouthpiece. The different segments of the tuba are shaped and bent from machinable brass using standard techniques.