The Bach 42BO Trombone has earned its reputation as one of the most popular and enduring large bore tenor trombones in modern brass history. Known for its .547 bore, 8.5" yellow brass bell, and open wrap F-attachment, the 42BO combines power, resonance, and responsiveness, making it a favorite among students, educators, and professionals alike.
This example, serial number 224335, arrived at The Brass Exchange in very clean condition. It underwent a complete shop service prior to listing, including chemical bath, rotor cleaning and adjustment, and handslide alignment. The result was a horn in excellent playing condition — smooth, balanced, and ready for performance at a professional level.
Cosmetically, the trombone showed only light evidence of use, with no structural issues or major wear. The original case was included and remained in excellent condition, providing both protection and authenticity.
For advancing players stepping into their first professional instrument, the Bach 42BO has long been one of the most widely approved models, frequently recommended by band directors and private teachers. Its versatility makes it suitable for high school, college, and professional performance across symphonic, chamber, and solo settings.
With modern Bach 42BO models retailing new for over $4,000 in 2025, this pre-owned example represented a smart choice for players seeking the legendary Bach sound at a fraction of the cost.
FAQ 🤔
Q: What does the “BO” in Bach 42BO mean?
“BO” designates the open wrap rotor design, which offers freer airflow, smoother transitions, and less resistance than a traditional closed wrap.
Q: Is the Bach 42BO considered a professional trombone?
Yes. The 42BO is widely regarded as a professional model, used by students, teachers, and orchestral players alike.
Q: Who is this trombone best suited for?
The Bach 42BO is ideal for advancing students entering college, adult amateurs, and professionals seeking a reliable, versatile large bore tenor trombone.
This Bach 42BO Trombone (SN 224335) has been sold and is now preserved here as a historical archive reference. Looking for a similar Bach 42 or other large bore tenor? 🔎 Browse available trombones
