BB-Tuba CC-Tuba F-Tuba Eb-Tuba Euphonium F TUBA HBS 288 F TUBA HBS 289 Technical details Bore size 18.5 mm Bell diameter 380 mm Height 880 mm Other informations 5 valves rotary (6 valves possible) Smal bore Classical F-Tuba Technical details Bore size 19.5 mm Bell diameter 420 mm Height 890 mm Other informations 5 valves rotary (6 valves possible) Large bore Orchestra F-Tuba F TUBA HBS 388 F TUBA HBS 389 Technical details Bore size 18/19/19.5 mm Bell diameter 380 mm Height 880 mm Other informations 5 valves, 4 piston/1 rotary Smal bore Good solo and quintet instrument Technical details Bore size 19/20/20.5 mm Bell diameter 420 mm Height 890 mm Other informations 5 valves, 4 piston/1 rotary Large bore Orchestra F-Tuba