Courtois AC551 Creation New York (bass)
Bb/F/G-Gb/Eb-D dual-bore bass trombone · professional · current
Focused projecting bass voice with convertible tuning
| Type | bass |
|---|---|
| Key | Bb/F/G-Gb/Eb-D |
| Bore class | dual |
| Bore size | .562/.578″ |
| Valve configuration | Double valves (independent / inline) |
| Valves | 2 |
| Rotor type | Hagmann |
| Wrap | open wrap |
| Bell diameter | 9.49″ |
| Bell material | yellow brass |
| Bell construction | one piece interchangeable, screw ring |
| Slide | dual-bore brass outer slide with nickel silver sleeves, hard-chrome-plated nickel silver inner slide |
| Leadpipe | interchangeable |
| Finish | clear lacquer |
| Level | professional |
| Era | current |
| Country | France |
Features: Two independent inline René Hagmann free-flow progressive-bore valves; convertible G/Gb second-valve tuning; screw-ring bell packs into flat viola-sized case; ergonomic left-hand rest. Yellow (AC551BHA) or gold brass (AC551BHRA) bell. Distinct from AC550 (dual bore, screw-ring, convertible valve).
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