✦ Instrument Overview
This Bach A47i Gold Brass Large Bore Tenor Trombone (.547 bore) is a used professional trombone that remains in virtually like-new condition. Designed for advanced and professional players, the A47i incorporates Bach’s precision Infinity rotor valve, which delivers a remarkably open, even response throughout the range.
The instrument features an 8.5-inch gold brass bell, standard-weight handslide, and gold brass tuning slide, producing a rich, centered tone with an elegant warmth unique to gold-brass construction. Its response and tonal clarity make it ideal for both orchestral and solo performance settings.
This A47i comes as a complete outfit, including the original factory case, two Bach mouthpieces, and full accessory kit. The horn has only been played a handful of times—it’s as close to new as you can find without paying full retail.
✦ Condition & Classification
Although listed as used, this instrument is not an open box model.
In the instrument world, open box typically refers to a new item that has been unsealed, demoed briefly, or returned after trial—often without factory inspection or full quality control review.
By contrast, this A47i is deluxe premium factory stock, carefully maintained, play-tested, and verified in our shop. It shows no signs of wear or cosmetic flaws, and performs identically to a new unit.
For anyone searching for a pre-owned professional trombone with full assurance of quality, this instrument offers exceptional value.
✦ Model Insight
The Infinity valve represents Bach’s modern evolution of the rotary design, engineered for seamless airflow and long-term reliability. Combined with the gold brass bell and tuning slide, this model provides enhanced tonal color and projection over the traditional yellow brass version.
New A47i trombones retail for over $5,000 USD, and this like-new example delivers the same sound and performance at a fraction of that cost.
✅ FAQ
Q: What does “open box” mean in musical instrument listings?
A: “Open box” typically refers to a new product that was opened, demoed, or returned, not factory-sealed, and may not include all original packaging or inspection. See more about "open box" retail instruments here.👉
Q: Is this A47i an open box item?
A: No. This trombone was fully inspected and verified in-house, not a demo or returned product. It’s classified as used, but is effectively new in condition and playability.
Q: What makes the Infinity valve special?
A: It provides an exceptionally smooth, efficient air path with reduced resistance, giving players effortless transitions and improved clarity in the lower register.
Q: Why choose gold brass over yellow brass?
A: Gold brass contains more copper, adding warmth and depth to the sound—especially effective in symphonic or chamber contexts.
This Bach A47i has been sold and now remains here as a historical reference for musicians researching modern Bach Stradivarius trombones.
Looking for a similar used professional trombone or current large bore model?
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🕑 Looking for what’s next?
Explore our Unpublished Used Trombones and Brass Instruments – Early Access List, featuring upcoming arrivals not yet photographed or fully serviced — available soon at The Brass Exchange.
🕑 Photography Note – Historical Workflow
Photos for this listing were taken before our most recent studio upgrades. Lighting and background differ from our current photography standards, but the images accurately represent the original instrument condition.
