Posted by Eve on May 07, 2001 at 03:39:13:
I'm supposing that the appropriate choice shank size for a Yamaha YEB-321 EEb would be the second category "S".
Tuba Shank Designations
Perantucci tuba mouthpieces are available with the following shanks:
No Indication: (15.2 mm)
Standard shank, for contemporary CC and BBb tubas with large receivers.
"S" on shank: (14.8 mm)
One size smaller, for CC and BBb tubas with small receivers and most Eb and F tubas.
"XS" on shank: (14.5 mm)
For Eb or F tubas with particularly small receivers.
"AM" on shank: (14.2 mm)
For instruments with extremely small receivers.