The Antoine Courtois Paris AC421BH New York series trombone with Hagmann valve combines traditional hand-hammered construction with modern performance efficiency. Its one-piece bell—offered in yellow or gold brass—is shaped by hand for a focused, elegant sound that continues to mature with the player. A .547" large bore supports strong projection and breadth of tone, while the open-wrap F-attachment and Hagmann valve deliver exceptionally smooth airflow and seamless register transitions. The standard-weight slide, built with yellow brass extrusions, produces a lively response that suits advanced articulation. Finished in durable lacquer and outfitted with a large-shank mouthpiece and fitted case, this instrument offers professional-level reliability for musicians who need both nuance and power in their daily work.

Hand-Hammered Bell and Hagmann Valve Expand Tonal Possibilities

Advanced players who value expressive versatility will appreciate how the AC421BH responds to technique and dynamic control. The hand-hammered bell provides clear projection and warmth, with yellow brass favoring articulate clarity and gold brass offering greater depth for rich orchestral lines. The open-wrap F-attachment and Hagmann valve allow effortless shifts between Bb and F, keeping airflow open and resistance low for fluid legato playing. Paired with a responsive yellow-brass slide, the instrument delivers vibrant articulation and consistent tone across demanding passages. Built for professional rehearsal, recording and live performance, this Courtois model supports confident, expressive playing on any stage.