大号 吹嘴 规格对照表 Model mm inches throat Description 62 3.185 1.254 21/64 A superior standard mouthpiece with a good centered sound and easy response in the high and low register with good intonation. Also recommended for Eb or F tuba. 66 31.52 1.241 21/64 Designed from the original Helleberg, this mouthpiece offers a smaller inside cup diameter but still produces a rich tone quality with a wealth of volume. SH 31.84 1.253 21/64 This Schilke “Helleberg” model offers a rim contour that is different from our #66. This mouthpiece produces a sound that is clear and dark. 67 32.41 1.276 21/64 Similar to the “SH” model, but slightly larger. The contour is also similar to the #66 but offers improved tonal response. 69C4 32.76 1.290 M With a very comfortable rim and cup that is not too deep, the 69C4 offers an excellent characteristic sound and facilitates all registers of the instrument.