Bb Tubas

– Bell diameter 420 mm (16,535 inch) – 3/4 – piston valves – Bore of valve section conical 18,8 –

– Bell diameter 450 mm (17,717 inch) – 4/4 – rotary valves – Bore of valve section 19,6 mm (0,772

– Bell diameter 450 mm (17,717 inch) – 4/4 – rotary valves – Bore of valve section 19,6 mm (0,772

– Model Ambassador – Bell diameter 500 mm (19,685 inch) – Number of valves 4 (3R/1L) – 5/4 – 4th