Large throat, extra slides, impeccable construction.
The 5100 Series of B&S tubas are a six rotary valve instrument with four valves right and two left. It is equipped with nickel silver inner and outer slide tubes, a corrosion-safe gold brass lead pipe. The rotary valve mechanism is supported by the heavily praised 3B linkage system. It additionally features a trigger for the second slide, and comes with a second exchangable lead pipe with a reversed slide. There are two additional slides as well on the 5100, a 7/8 and a 9/8 for impacting the intonation of the fifth valve. It features a graduated bore that begins at .748" and terminate at .827" (19-21 mm). It has a 16.5" (420mm) large throat bell and stands 38" tall.
This design has been 40 years in development and growth, and has inspired entire generations of tuba players. The sound, response and overall design has made B&S a major player among major players.