Bach 42BOF Stradivarius Tenor Trombone in Bb w/ Open Flow Valve

Bach 42BOF Trombone – Symphonic Power with Modern Precision

The Bach 42BOF Trombone represents a modern evolution of one of the most iconic orchestral trombone designs ever created. Built on the legendary Bach 42 platform, the 42BOF incorporates advanced features like an open-flow valve and bell-free bracing to deliver a more responsive, resonant playing experience—ideal for serious students, educators, and professional performers.

Built for Musical Development

The 42BOF is designed to help advancing players refine tone control, airflow efficiency, and dynamic flexibility. Its large bore and open design encourage proper breath support while producing a broad, centered sound that defines the symphonic trombone voice.

The open-flow valve system improves response in the low register while maintaining clarity in the upper range, allowing students to develop consistent tone and intonation across all registers. This makes it especially valuable for players transitioning into advanced ensemble and solo repertoire.

Key Features & Benefits

• Open-Flow Rotary Valve – Provides a more free-blowing feel with improved low-register response
• Bell-Free Bracing Design – Allows the bell to vibrate more freely, increasing resonance and projection
• Traditional #42 Bell – Known for its ability to produce a wide range of tonal colors
• Large Bore (.547") – Supports a full, symphonic sound with excellent projection
• Open Wrap F-Attachment – Reduces resistance and creates a more even response throughout the instrument
• Professional Handslide Options – Designed for smooth, precise slide action
• Antimicrobial Lacquer Finish – Helps protect the instrument in high-use environments

Specifications

• Key: Bb/F (F-Attachment)
• Bore Size: .547"
• Bell Diameter: 8.5" (one-piece, hand-hammered)
• Bell Material: Yellow brass
• Valve: Open-flow rotary valve
• Wrap Style: Open wrap
• Finish: Clear lacquer (antimicrobial)
• Included Accessories: Case and mouthpiece

Why Artists Choose Bach

Bach trombones have long been considered the standard in symphonic brass playing, trusted by professionals and educators worldwide. The 42 series, in particular, is known for:

• Rich, orchestral tone quality with exceptional projection
• Consistent response and intonation across all registers
• Flexibility in tone color, allowing players to adapt to multiple musical styles
• Time-tested design used by students, educators, and top-tier performers

The 42BOF builds on this legacy by incorporating modern innovations that make the instrument more responsive and efficient—without losing the core Bach sound.

Ideal For

• Advancing high school and collegiate trombonists
• Wind ensemble, orchestra, and symphonic band settings
• Players transitioning to a professional-level instrument
• Educators and performers seeking a versatile large-bore trombone

The Bottom Line

The Bach 42BOF Trombone is a professional-level instrument designed with education in mind. Combining the iconic Bach 42 sound with modern enhancements like the open-flow valve and bell-free bracing, it provides the response, projection, and tonal flexibility needed for serious musical growth and high-level performance.