Bell The new YAH-803S features a one-piece yellow brass bell. With a diameter 5mm larger than that of the YAH-602, the new horn's dynamic range is increased noticeably. First Branch The first branch features a newly designed taper improving tone and pitch. Valve Casing The YAH-803S's valve casing benefits from a new, heavier design. The sound becomes more rich and powerful from the additional weight. Tuning Slide Additional improvements to sound, pitch, dynamic range and playability have been achieved with the development of a wider, newly tapered tuning slide.