Detail 01
Bach 22 equivalent
Large diameter with a deep cup. Fills out the bottom octave, at the cost of endurance up high.

Independent shopping perspective
Yamaha's standard 67 tuba mouthpiece, cut in the Bach 22 pattern. A large, all-purpose piece for concert band and orchestral tuba players.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Large diameter with a deep cup. Fills out the bottom octave, at the cost of endurance up high.
Detail 02
Numbers step through sizes. The 64 and 65 sit near Bach 25, the 66 near a Schilke Helleburg, this one larger and deeper.
Detail 03
Yamaha's production line rather than a signature or custom cut. Consistent unit to unit and easy to replace.
Detail 04
Variants of the same rim with a shallower cup. The 67b4 is the F tuba version of this size.
Detail 05
Needs real air support. Players stepping up from a student mouthpiece often lose range before they gain tone.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
It follows the Bach 22 pattern in size and cup. Yamaha builds and finishes it their own way, so the feel is not identical.
The 66 corresponds to the Schilke Helleburg, and the 66b is the same idea with a shallower cup.
The deep cup favors big BBb and CC horns. For F tuba, the 67b4 is the shallower version of this size and matches a Miraphone C3.
Only if your air support is developed. It is a large, deep piece — jumping straight to it can cost you range and endurance.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.