The cimbasso is an orchestra brass musical instrument and is part of the low brass family, covering the same range as the tuba or contrabass trombone; most often pitched at F.
["In short, no; the cimbasso is not a transposing instrument. "]
["The cimbasso was originally an Italian instrument specified by Verdi and other Italian opera composers to be used as the bass voice for the brass in the orchestra instead of a tuba."]