Overview
This Bach 36BO-K trombone from the mid-1990s remains in excellent cosmetic and playing condition. The instrument combines several desirable features including a lightweight nickel silver handslide, open-wrap K-valve rotor, and the traditional 8" yellow brass bell used on the Bach 36 series.
With its .525" medium bore, the 36BO-K occupies a unique position in the trombone world. It provides greater depth and projection than smaller jazz trombones while still offering more agility and efficiency than large-bore orchestral instruments such as the Bach 42B.
The handslide on this example is straight, smooth, and requires no additional service. The only cosmetic note is a very small ding on the tuning slide (approximately 3 mm) that has no impact on the instrument’s performance.
Tonally, the instrument delivers the classic Bach warmth and centered response, making it flexible enough for chamber music, concert band, pit orchestra, and even some orchestral repertoire.
The trombone includes the original Bach woodshell case, also in excellent condition.
✦ Historical Perspective
The Bach 36 series has long been considered one of the most versatile medium-bore trombone designs ever produced. Many players appreciate its ability to function in a wide range of musical settings without the air requirements of a full .547 orchestral instrument.
The 36BO-K variant adds two notable upgrades:
• Lightweight nickel silver slide (LT) for quicker response and reduced resistance
• Open-wrap K-valve rotor, improving airflow and providing a more open feel in the low register
These refinements make the instrument particularly attractive for advancing students, educators, and professionals who want a responsive F-attachment trombone that remains efficient across multiple styles of playing.
Questions Trombone Players Often Ask
What is the difference between a Bach 36BO-K and a standard 36B?
The 36BO-K includes a lightweight nickel silver handslide and an open-wrap K-valve rotor, which improve response and airflow compared with the traditional closed-wrap 36B configuration.
Where does the Bach 36BO-K fit compared with larger trombones?
The .525 bore sits between small-bore jazz horns and large orchestral instruments. It offers flexibility, projection, and efficiency, making it suitable for many musical environments.
Is the Bach 36 series still relevant today?
Yes. Many players continue to rely on medium-bore trombones like the 36 series for chamber music, teaching studios, pit orchestras, and contemporary repertoire.
📸 Photography From Our Early Archive
Some photographs associated with this listing originate from the earlier years of The Brass Exchange archive, when our studio photography process was still evolving. Over time we have refined our lighting techniques, backgrounds, and camera systems to better showcase the craftsmanship of brass instruments.
These earlier photos remain part of the instrument’s historical record and reflect the ongoing effort to build a visual archive dedicated to fine-art photography of brass instruments and the documentation of vintage trombones.
🔧 Availability & Archive Status
This trombone has been sold and now appears in The Brass Exchange archive as a historical reference for players researching Bach 36BO-K trombones and medium-bore professional instruments.
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