King 4BF Sonorous
Bb large-bore tenor trombone · professional · vintage
Large-bore symphonic tenor with big, open tone and F-attachment low range
| Type | tenor |
|---|---|
| Key | Bb |
| Bore class | large |
| Bore size | .547″ |
| Valve configuration | F attachment |
| Valves | 1 |
| Rotor type | traditional rotary |
| Wrap | closed wrap |
| Bell diameter | 8.5″ |
| Bell material | yellow brass |
| Slide | nickel silver |
| Finish | clear lacquer |
| Level | professional |
| Era | vintage |
| Country | USA |
| Years | 1960s-1970s |
Features: F-attachment version of the 4B Sonorous large-bore symphonic tenor