✦ Instrument Overview
The Bach 42BO Open Wrap Tenor Trombone remains one of the most recognized professional large-bore designs ever built. This example, less than five years old, features the popular open wrap F-attachment that offers freer airflow, easier low-register response, and smoother transitions between the trigger and straight positions.
It has been fully serviced in our shop — complete chemical bath, rotor and handslide service, mechanical alignment, and inspection. There are no dents, repairs, or lacquer issues, and the horn plays evenly throughout all registers.
The 8.5″ yellow-brass bell delivers the signature Bach clarity and projection that have defined generations of orchestral and symphonic players. For advancing students, this model provides a direct step into professional equipment quality without the new-instrument price.
✦ Condition & Service Details
Full cleaning and mechanical service completed upon arrival.
Hand-slide is straight, fast, and properly aligned.
Rotor linkage is silent and smooth.
No evidence of previous damage or repair work.
Original finish ≈ 95 % intact.
Includes factory hard case, one Bach mouthpiece, and starter lubricants for both slide and valve.
✅ Common Questions
What makes an open-wrap trombone different?
An open wrap routes the F-attachment tubing in a more gradual path, minimizing bends and back-pressure. The result is freer airflow and easier tone control — especially in the lower register.
Is this the right model for a student upgrading from a 36B or small-bore horn?
Yes. The 42BO’s .547 bore and open wrap provide a responsive yet forgiving transition into the large-bore category. It’s the ideal “first pro horn” for high-school or early-college players.
Why do professionals still choose the 42BO?
Its balance of warmth, focus, and projection keeps it a standard in symphonic and solo literature. Many current Bach 42 variations trace directly back to this configuration.
📦 Included Accessories
Bach factory hard case with clean lining and secure latches
Bach 6 ½ AL mouthpiece
Slide and rotor lubricants
This Bach 42BO Open Wrap Tenor Trombone has been sold and is shown here for educational and reference purposes.
Interested in a similar instrument or exploring trade-in options? 🔎 Browse current Bach trombone listings or complete our Trade-In Form ✍️.
