C.G. Conn 20K Series BBb Sousaphone - Silver Plated Learning and Practice>Accessories>Practice Aids A built-in chromatic tuner lets

A built-in chromatic tuner lets you bypass the currently selected patch while tuning

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C.G. Conn 20K Series BBb Sousaphone - Silver Plated Learning and Practice>Accessories>Practice Aids A built-in chromatic tuner letsGet An Industry Standard With The C. G. Conn 20K Series BBb Sousaphone The "original" sousaphone. This large bore sousaphone has the most sought after sound for the marching field. Ergonomically friendly as well as improved bracing over time for the demands of todays marching activity. Historic design in sousaphones, the C. G. Conn 20K originated from the concepts of John Philip Sousa in the early 1900's. This large bore . 734" with a 26" bell