The Probert Encyclopaedia of Music

SACKBUT

The sackbut was a musical instrument of the brass family, developed during the 14th century, like a bass long trumpet, so contrived that it can be lengthened or shortened according to the tone required. The trombone developed from the sackbut. The sackbut of the Scriptures was a stringed instrument, the translators of the King James bible having been mistaken in their translation, which should not read sackbut but rather sambuca.
Research Sackbut