BB-Tuba CC-Tuba F-Tuba Eb-Tuba Euphonium Euphonium HBS 378 Euphonium HBS 479 Technical details Bore size 15/16 mm Bell diameter 305 mm Height 660 mm Other informations 4 valves piston Automatic compensating system Brillant sound Technical details Bore size 15/17 mm Bell diameter 305 mm Height 660 mm Other informations 4 valves piston Automatic compensating system Full rich sound