This Bach 50B2O dependent bass trombone is a rare find—approximately 20 years old, yet barely played. It comes from a single-owner collection and includes all original paperwork, accessories, and even the unused tuning slide keys. The case has never left the owner’s home, and the condition of the instrument is truly exceptional.
The Bach 50B2O features a 9.5" yellow brass bell, .562 bore standard-weight handslide, and traditional dependent rotary valve system. Despite the popularity of independent valve systems today, this design remains a powerful, intuitive setup—especially for players with tenor trombone experience. You get the flexibility of an F attachment for extended low range, and when both valves are engaged, the system provides access to low Eb in first position and even low B in sixth.
The slide action is fast and quiet. The rotary valves are airtight and responsive. There is not a scratch, dent, or blemish on the instrument—it’s as close to new as you can find outside a factory box.
For reference, this same model currently sells new for $5,499 plus tax at major retailers like Sweetwater. If you're a tenor player transitioning to bass or someone looking for a pristine pro-level dependent valve bass trombone, this is a golden opportunity.
What’s the difference between dependent and independent valves?
Dependent valves are configured in sequence, so the second valve only engages when the first is pressed. This keeps the tubing shorter and lighter but offers less alternate-position flexibility than an independent setup.
Is this instrument suitable for orchestral or jazz use?
Yes. While ideal for classical and symphonic settings, the dependent system also works well for commercial or jazz bass trombone parts due to its simplicity and balance.
Would this be good for a tenor player switching to bass?
Absolutely. Many tenor trombonists find the dependent valve layout more intuitive when learning bass, since it mirrors the familiar F attachment with added range.
This Bach 50B2O bass trombone has been sold and is now shown here as a historical reference for collectors and players.
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