| Models | Backbore | Cup Volume | Cup Volume | Cup Diameter r2 | r4 | Rim | ||||
| 66 | Number | Description | Cubic Inches | Inch | mm | Fraction | @.032" | Contour | Bite | Alpha Angle |
| 66Z* | 1 | Small | 0.664 | 0.66 | 16.76 | 42/64 | 0.669 | Flat Med. - Wide | Medium | High |
| 66Z** | 1 | Small | 0.0669 | 0.66 | 16.76 | 42/64 | 0.673 | Flat Med. - Wide | Soft | High |
| 66SZ | 1 | Small | 0.0683 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| G66** | 1 | Medium Small | 0.0718 | 0.66 | 16.76 | 42/64 | 0.673 | Medium Wide | Medium | High |
| G66*** | 2 | Medium | 0.0793 | 0.66 | 16.76 | 42/64 | 0.673 | Medium Wide | Medium | Medium High |
| 66S | 1 | Small | 0.072 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| 66MS | 2 | Medium Small | 0.076 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| 66M | 2 | Medium | 0.079 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| 66MX | 3 | Medium Large | 0.085 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium |
| 66L | 3 | Medium Large | 0.087 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium |
| 66LX | 3 | Large | 0.0884 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Low |
| 66CX | 3 | Medium Large | 0.0871 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Low |
| 66C* | 3 | Medium Large | 0.0831 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| 66C** | 3 | Medium Large | 0.0834 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| 66C | 3 | Medium Large | 0.08 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium High |
| 66VB | 3 | Large Semi-V | 0.0857 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium |
| 66VC | 3 | Large Semi-V | 0.0862 | 0.66 | 16.76 | 42/64 | 0.673 | Medium | Medium | Medium |
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Quick Comparison - The GR 66 Series cup diameter is similar to a conventional 3 diameter. The 66M is a very popular choice for 3C players looking for more core in their sound with more secure articulations. The 66Z Series and 66SZ are popular alternatives for players who "bottom out" or get a thin sound and poor articulations on a conventional 14A4a or similar models. Classic Blank is standard. Symphonic Blank is standard on the C** and C models. Studio, Symphonic, and FatBoy are available as a special order on some models. Backbores, other than listed, are special orders. 66Q Series
The Q rim is slightly flat, outside diameter follows tradition in width
and contour, highpoint is further out than the standard GR Rim, the bite is
medium sharp with the traditional feel and grip, and the alpha is medium for lip
freedom, support, and articulation. The
bite grip holds the lips from penetrating too far into the cup. Q* Models have lower Beta Angles for a more "Traditional" sound.
66QM 66QMX...Q Rim, GR MX Cup. Same angle as GR MX Cup. More edgy than the Q* Models. #3 Backbore, Classic Blank 66Q*...Q Rim, similar to GR C* Cup. 1st Cup radius is slightly more open than the C*. #3 Backbore, Symphonic Blank
66Q*B 66Q*C...Q Rim. Excellent C Trumpet Mouthpiece. Very open blow. #3 backbore, Symphonic Blank, Larger bore similar to Haefner and VC Cups. 66C-T and 66B-T Similar to 67 C-T and 67B-T but with a slightly smaller .660" Cup Diameter. 66ES Similar characteristics to the 64ES and 65ES but with the wider .660" cup diameter. 66X .660" cup diameter, alpha angle between the L and the LX with slightly less cup volume. G Rim Models G66MX, G66L, G66X, G66LX, G66BX, G66CX, G66VC Same cups as their standard counterparts but with the slightly wider G Rim. These are a special order. |