Bach 42BO Stradivarius (Open Wrap)

About the Bach 42BO Stradivarius (Open Wrap)

The 42BO shares its core bell and slide with the standard 42B, but its F-attachment tubing is routed in an open-wrap configuration - a looser, less convoluted path for the air than the traditional wrap uses, specifically engineered to reduce resistance and give a more open feel when the rotor is engaged. That difference matters most to players doing extensive low-register or F-attachment work, where backpressure from a tighter wrap becomes noticeable over a long performance.

As part of the Stradivarius line, the 42BO carries Bach's reference-standard orchestral trombone sound - a design so influential that most modern professional tenor trombones, regardless of maker, are implicitly compared against the 42-series Bach. Its standard rotor valve (rather than a Thayer or similar axial-flow valve) is the traditional configuration many orchestral players still prefer for its familiar feel and sound.

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Sound character of the Bach 42BO Stradivarius (Open Wrap)

The 42BO's larger 8.5-inch yellow brass bell and open-wrap F attachment give it a broader, warmer orchestral tone than a straight student horn, with the open-wrap tubing routing air on a looser path that reduces backpressure and keeps the low register and F-attachment work feeling free rather than resistant. As the reference-standard Stradivarius orchestral trombone, it's built for a full, resonant sound that projects in ensemble settings.

Technical data for the Bach 42BO Stradivarius (Open Wrap)

The history of the Bach 42BO Stradivarius (Open Wrap)

The Bach 42BO extends the reference-standard Stradivarius 42 trombone design with an open-wrap F attachment for players who prioritize reduced backpressure.