Bach Trombone Build Sheet
Dated: 9/6/1957
Mounting Chart
Gauge #23 (minus .0015″)
Brass thickness .021″ (.55mm)
Bell Diameter 7.500″
Model | Bell | Slide Bore | Mouthpipe | Slide Crook | Bell | Lrg. Tuning Slide Tube | Tuning Slide Bow | Sml. Tuning Slide Tube | Gooseneck |
4 | 7.500″ | 0.468/0.485 | #412 | 0.518″ | #440 | 0.721″ | #431 | 0.562″ | #411 |
5 | 7.500″ | 0.485″ | #412 | 0.522″ | #435 | 0.696″ | #435 | 0.541″ | #435 |
6i | 7.500″ | 0.485″ | #412 | 0.522″ | #401 | 0.721″ | #411 | 0.582″ | #411 |
6ii | 0.485″ | #412 | 0.522″ | #425 | 0.721″ | #411 | 0.562″ | #411 | |
6iii | 0.485″ | #412 | 0.522″ | #425 | 0.670″ | #416 | 0.528″ | #416 | |
6iv | 0.485″ | #412 | 0.522″ | #431 | 0.721″ | #416 | 0.562″ | #411 | |
6v | 0.485″ | #412 | 0.522″ | #431 | 0.670″ | #416 | 0.528″ | #416 | |
6vi | 0.485″ | #412 | 0.522″ | #436 | 0.721″ | #431 | 0.562″ | #411 | |
6vii | 0.485″ | #412 | 0.522″ | #440 | 0.721″ | #431 | 0.562″ | #411 | |
7 | 0.485/0.495″ | #402 | 0.524″ | #449 | 0.721″ | #411 | 0.562″ | #411 | |
8 | 0.490″ | #418 | 0.527″ | #425 | 0.721″ | #411 | 0.562″ | #411 | |
9 | 0.485/0.500″ | #428 | 0.530″ | #425 | 0.721″ | #411 | 0.562″ | #411 | |
10 | 0.495″ | #418 | 0.532″ | #425 | 0.721″ | #411 | 0.562″ | #411 | |
12 | 0.500″ | #423 | 0.536″ | #425 | 0.721″ | #411 | 0.562″ | #411 | |
16 | 0.495/0.509″ | #402 | 0.540″ | #425 | 0.721″ | #411 | 0.562″ | #411 |
model #4 “Pick a light (thinner) bell like model 6 (stamp model 4)”
model #6ii “same as 8-12-16 bell”
Source: Irvin Karan @ Slidebone (from Sheldon Ginsburg (Philly) from Peppy (John) Pettinato.)
Bach Trombone Build Sheet
Dated: 9/6/1954
Model | Slide Bore | Mouthpipe | Slide Crook | Bell | Lrg. Tuning Slide Tube | Tuning Slide Bow | Sml. Tuning Slide Tube | Gooseneck |
6i | 0.485″ | #412 | 0.522″ | #401 | 0.721″ | #411 | 0.582″ | #411 |
6ii | 0.485″ | #412 | 0.522″ | #425 | 0.721″ | #411 | 0.562″ | #411 |
6iii | 0.485″ | #412 | 0.522″ | #425 | 0.670″ | #416 | 0.528″ | #416 |
6iv | 0.485″ | #412 | 0.522″ | #431 | 0.721″ | #416 | 0.562″ | #411 |
6v | 0.485″ | #412 | 0.522″ | #431 | 0.670″ | #416 | 0.528″ | #416 |
6vi | 0.485″ | #412 | 0.522″ | #436 | 0.721″ | #431 | 0.562″ | #411 |
6vii | 0.485″ | #412 | 0.522″ | #440 | 0.721″ | #431 | 0.562″ | #411 |
Some notes to add-
1. Models iii and v have the smallest bell thoats and smallest larger slide tubes, therefor making them the least desirable.
2. All bells listed on this sheet are from 1957 after Bach went to all 7 1/2 inch bells as standard sizes. Earlier M.V. and N.Y. bells could have 7 inch bells, but that would be the only variable from these numbers.
Source: Dr. Jason Oliver, D.M.A., Southeastern Oklahoma State University