The Trombone That Defined a Sound
If you've sat in an orchestra pit, marched through a conservatory practice hall, or simply watched a professional trombonist work through a Mahler symphony, chances are you've already heard the Bach 42BO — you just didn't know it by name. It's the most popular selling Bach Stradivarius symphonic trombone, and that reputation didn't happen overnight. It's the result of decades of consistent performance across stages, studios, and rehearsal rooms.
It features an 8-1/2" one-piece hand-hammered bell that has defined the symphonic sound for generations, and the .547" large bore combined with the open wrap F attachment offers outstanding clarity and projection with less resistance. Whether you're navigating a demanding orchestral excerpt or working through a solo recital, the 42BO gives you a platform that doesn't get in your way.
The Bach Stradivarius 42BO professional trombone is ideal for both symphonic and solo performance. If you're ready to play a horn that serious trombonists trust, this is it.
The Bell: Where the Sound Starts
Bach fitted the 42BO with a 1-piece bell made of yellow brass, flaring out to an impressive 8.5 inches for robust projection. That one-piece construction means there are no seams to interrupt the bell's natural resonance — the metal vibrates as a single unified surface, which contributes to the trombone's characteristic fullness and evenness across registers.
This professional symphonic horn is constructed from yellow brass to give you a classic tone with a generous serving of low-end presence and treble detail. The clear lacquer finish adds a subtle warmth to the sound overall. It's a combination that rewards players who want control over their color — from dark and centered to open and bright — without fighting the instrument to get there.
The Open Wrap F Attachment: More Range, Less Resistance
Bach's team of engineers consider the F attachment as a vital component that contributes to the overall tone. Bach opted for an open wrap instead of the traditional closed wrap, which has a reputation for choking tone and making it difficult to hit a C2 without using pedal tones.
An open-wrap design results in fewer bends in the tubing, which creates a free-blowing trombone, and the 42BO's .547" bore and 8.5" bell produce a large, symphonic sound with clear projection. The open-wrap F-attachment section offers a more uniform sound, so when you use the F-attachment, the sound is not different from the sound of the trombone without engaging the trigger. That consistency is a genuine advantage in ensemble playing — your section mates won't notice the switch, and neither will you.
Slide Action and Construction Details
The chrome-plated nickel silver inner handslide tubes provide the ideal surface for smooth and quick handslide action. The 42BO also has a yellow brass outer slide for speedy slurs and glissandos. The combination of chrome-plated nickel inner tubes against yellow brass outer tubes is a time-tested pairing that generations of trombone players have come to rely on for speed and consistency.
More than a century later, Bach instruments are proudly crafted in Elkhart, Indiana, to the same lofty standards as those from the '20s and '30s. That continuity of craft is part of what makes a 42BO feel like more than just a purchase — it's a connection to a long lineage of players who trusted the same design.
Product Features:
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Key: Bb/F
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Bore: .547" large bore
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Bell: 8.5" one-piece hand-hammered yellow brass bell
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F Attachment: Open wrap design for free blowing and consistent tone with or without the trigger engaged
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Valve: Standard rotary valve
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Inner Slide: Chrome-plated nickel silver for smooth, quick action
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Outer Slide: Yellow brass
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Finish: Clear lacquer
- Made in Elkhart, Indiana, USA
Brand: Bach
Model: Stradivarius 42BO
SKU: 42BO
Condition: New
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