| Yamaha Model No. |
Approximate Size Equivalent |
|---|---|
| 64 | Bach 25, smaller rim diameter |
| 65 | Bach 25 |
| 66B | Schilke Helleberg, shallower cup |
| 66 | Schilke Helleberg |
| 66D4 | Bach 24AW |
| 67B4 | Miraphone C3, shallower cup (For F tuba) |
| 67 | Bach 22 |
| 67C4 | Miraphone C3 |
| 68B | Schilke 69C4 |