Tuba BE1087 Student Bb Tuba Instrument details Both the Eb (BE1077) and Bb (BE1087) tubas are free blowing with an ease of tone production and an even response. The mouthpipe is carefully positioned to give the optimum playing comfort and the valve technology produces complete accuracy and reliability. A lightweight design makes these tubas exceptionally easy to hold and carry, with their depth and quality of tone capturing the essence of the legendary Besson sound.