Bass Tuba, brief description
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“Classification
Aerophone, lip-vibrated instrument, brass wind instrument. Belongs to the valved bugle-horns family.
Material
Brass, gold brass, nickel silver, gold lacquer.
Mouthpiece
Deep cup mouthpiece
Tubing
Length 350–400 cm, conical along entire length
Bore
Very wide, inner diameter 17.3–19.5 mm
Valves
Four to six valves (lowering pitch by 1, ½, 1½ steps, fourth-valve, fifth-valve – this can also be a compensating valve with a wide whole step. The 6th valve is a compensating valve with a wide half step).
Bell
Rim diameter 35.5–41.9 cm”