Bach 42AF Infinity Valve Trombone – Super Mint
Offered here is a Bach 42AF large bore tenor trombone featuring the acclaimed Infinity axial-flow valve. This example was lightly used—not a factory second or B-stock—and arrived to us in truly super mint condition.
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This instrument has now been sold and is preserved in our archive as a historical reference for collectors and players researching high-end Bach trombones.
At The Brass Exchange, we have handled hundreds of Bach 42-series trombones across multiple eras and configurations, and examples like this represent some of the most refined modern builds of the model.
The 42AF features the classic 8.5" yellow brass bell paired with a standard weight .547 bore handslide. It is outfitted with a Bach premium hardshell case in pristine condition. Both the valve section and slide performed flawlessly during play testing, and the instrument received full shop service prior to sale. The lacquer remains near perfect, with minimal signs of use.
The Bach 42AF represents one of the most refined modern iterations of the 42 series—well suited for orchestral and symphonic playing, where a rich core tone, centered articulation, and consistent valve response are essential. The Infinity valve design offers a smooth, stable feel through the valve register, making it a popular choice among advancing and professional players alike. At the time of listing, this model sold new for approximately $4,000, reflecting its position as a serious investment in a professional-level instrument.
❓ Questions Trombone Players Often Ask
What is a Bach 42AF Infinity valve trombone worth?
Value depends heavily on condition, valve performance, and slide quality. Clean, professionally serviced examples from a trusted shop typically command a premium compared to private sales, as proper setup and playability are already verified.
How does the Infinity valve compare to traditional Thayer valves?
The Infinity valve is designed to provide smoother airflow and more consistent response through the valve register. Many players experience a more stable and balanced feel with slightly less resistance compared to earlier axial-flow designs.
Is the Bach 42AF considered a professional orchestral trombone?
Yes. The 42AF sits at the top of Bach’s modern large bore lineup and is widely used in orchestral, symphonic, and advanced ensemble settings.
🔎 Looking for a Bach 42AF or Similar Model?
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