Schilke 66 vs Yamaha BB-65
The Schilke 66 has a wider cup diameter, the Yamaha BB-65 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Schilke 66
• Tuba
Cup diameter31.52 mm / 1.2409 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha BB-65
• Tuba
Cup diameter30.95 mm / 1.2185 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Schilke 66 has a cup diameter of 31.52 mm / 1.2409 in compared to 30.95 mm / 1.2185 in on the Yamaha BB-65 — a difference of 0.57 mm / 0.0224 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.