Bach 42BO Tenor Trombone Overview

The Bach 42BO Stradivarius is a respected professional large-bore tenor trombone developed for orchestral, symphonic band, and advanced ensemble playing. The Model 42 series has long held an established place among professional tenor trombonists, and the 42BO pairs that familiar Bach tonal concept with an open-wrap F attachment designed for an open response through both sides of the instrument.

Bach 42BO Tenor Trombone Specifications

• Key: Bb/F
• Bore Size: .547 inch
• Bell Diameter: 8.5 inches
• Bell Material: One-piece hand-hammered yellow brass
• F Attachment: Open wrap with rotary valve
• Finish: Clear lacquer
• Case: Fitted Bach hard case
• Accessories: Bach 6 1/2A large-shank mouthpiece and Vincent Bach Model 1880 slide cream
• Serial Number: 226577

Condition & Setup

This lightly used Bach 42BO is in excellent playing order and has been professionally serviced, set up, and play-tested. The lacquer and metal components remain bright, with fine scratches and localized scuffing on the bell throat around and below the engraving. The fitted hard case is structurally intact and shows faint exterior handling marks.

Who the 42BO Tenor Trombone Is For

The 42BO is intended for professional players, advanced students, and serious ensemble musicians seeking a large-bore tenor with a centered core, substantial projection, and the added register flexibility of an F attachment. Its established orchestral sound concept and open-wrap configuration make it particularly relevant for symphonic, wind ensemble, solo, and low-register tenor trombone work.

Common Questions About the Bach 42BO

How does the 42BO differ from the Bach 42B?

Both are .547-inch large-bore Bb/F Stradivarius tenor trombones. The 42BO uses an open-wrap F attachment, while the 42B uses a traditional wrap. Players commonly choose between them according to their preferred airflow, response, balance, and attachment feel.

What does the open-wrap F attachment contribute?

The open wrap reduces the number of tight bends in the attachment tubing. Its design supports a more open airflow through the F side and is often preferred by players who want the valve register to feel closely connected to the open horn.

What musical settings suit the Bach 42BO?

The 42BO is widely used for orchestral, symphonic band, chamber, solo, teaching, and advanced collegiate work. Its large bore and F attachment are especially useful when a full tenor sound and dependable access to the lower register are priorities.

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