Description
100%-to-scale model of an Amati-Kraslice A51 tenor trombone-shank natural trumpet/bugle mouthpiece, intended to be very close to the original design.
The cup profile is somewhat like the Vincent Bach 1-1/4C, 1 [no letter], or Schilke 20 mouthpieces, with nearly a tenor trombone shank instead of the trumpet shank seen on these other models.
This is in the A19 signal horn/natural trumpet mouthpiece series, standard issue for the ABG-291. Amati-Kraslice states the A19 series pieces are for "bugles and fanfare trumpets", and can be used on other F/E-flat/alto-voice natural trumpets with this shank size. The general design has been in production since the 1950s or 1960s.
The catalog claims the shank opening outer diameter is 10.2 mm, but Vennture measured it at 10.348 mm / 0.4074", smaller than the 0.4220" VennCAD default tenor trombone mouthpieces.
Supposedly this is the small-shank version of the A60, with a larger shank with outer opening diameter of 10.7 mm.
It's a decent match with the Amati-Kraslice ABG-221 cavalry-style bugle, pitched in F. This bugle is coincidentally the inspiration model for the "Ceremonial Bugle".
The Amati ABG-221 does not have perfect intonation, but the A51 slots relatively solidly for "Taps", though the tone could stand to be mellower. For a trumpet player, the A51 makes it relatively easy to clearly articulate fast bugle calls on the ABG-221, giving an almost "heroic", orchestral French horn tone to some calls.
Note that the ABG-221 receiver opening has a diameter measuring 12.07~12.11mm / 0.476~0.477" (shank fit & caliper measurements in photos). The Materialise prints ordered are shown fitted with the ABG-221 for reference.
Al Cass, Chasons, Lausmann, and others have made smaller mouthpieces to assist brass musicians crossing over to/from trumpet and trombone. Thus, the A51 might help trumpet players to double on trombone or small-shank euphonium.
If you haven't encountered the "Ceremonial Bugle" before, it is a bugle-shaped metal device, with an electronic speaker insert used to simulate bugle calls, mainly "Taps" at military funerals. When the speaker insert is removed, they can be played normally, but they come with a shallow-cup, ill-fitting mouthpiece. This setup does not sound good, also due to their shoddy construction/prone to leaks, compared to the well-made Amati-Kraslice original version.
No dimensions have been adjusted or modified for printing. For print verification, the STL has overall length 87.26 mm / 3.436", and [greatest] outer diameter of 27.90 mm / 1.099".
Note that the shank opening is somewhat thin and fragile with resin prints.
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 mouthpiece 3D rendering "Pin It")
