Detail 01
Size 66 (Helleburg-style)
Deep cup, broad rim. Favors a dark, wide low register over easy upper-register response.

Independent shopping perspective
Yamaha tuba mouthpiece, size 66. A deep Helleburg-style cup for players wanting a broad, dark low register on a large tuba.

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
Deep cup, broad rim. Favors a dark, wide low register over easy upper-register response.
Detail 02
The B version is the same shape with a shallower cup, if the 66's depth costs you high notes.
Detail 03
A different cup profile again. Worth knowing exists if the 66 doesn't sit right on your face.
Detail 04
Larger rims support low-register volume but tire the embouchure faster on long sessions.
Detail 05
Shallower, smaller-cup options. 64 has a smaller rim diameter than 65, which is the tighter step down.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
It corresponds to the Schilke Helleburg. The 66B is the same profile with a shallower cup.
Check the receiver on your instrument. Tuba mouthpiece shanks vary, so confirm the shank matches before ordering.
The 66 has the deeper cup for a darker low register. The 66B is shallower, which helps if you struggle in the upper range.
The 67B4 is the size in this line aimed at F tubas. The 66 suits larger BBb and CC horns.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.