BB-Tuba CC-Tuba F-Tuba Eb-Tuba Euphonium     Eb TUBA HBS 488   Eb TUBA HBS 688 Technical details Bore size 18/19 mm Bell diameter 400 mm Height 880 mm Other informations 4 valves piston/FRONT ACTION Automatic compensating system Band and orchestra instrument Technical details Bore size 18/19 mm Bell diameter 480 mm Height 880 mm Other informations 4 valves piston/TOP ACTION Automatic compensating system Band instrument