Williams Trombone Model designations (back to at least 1946)
| MODEL | NO. | BORE (in.) | BELL (in.) | VALVE(S) | REMARKS |
|---|---|---|---|---|---|
| 2 | .465 | ||||
| 3 | .480 | ||||
| 4 | .491 | 7 | |||
| 5 | .491 | 7 | F | ||
| 6 | .500 | 7.5 | Similar in sound to the King 3b, but with a larger throat and more air efficiency | ||
| 7 | .500 | 7.5 | F | ||
| 8 | .522 | 8 | |||
| 9 | .522 | 8 | F | ||
| 10 | 0.562 | 9.5 | F | production of this model started in the early 1960s. The first few produced had Conn 72H bells and Earl’s slides. Then he made his own bells and produced a total of 12 bass trombones. Seven of them can still be accounted for. |
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