The Yamaha YSL-640 is a professional-level medium bore tenor trombone, built with Yamaha’s reputation for consistency, durability, and precise engineering. Featuring an 8.5" yellow brass bell and a lightweight .525 straight bore slide, it delivers both warmth and clarity with excellent projection.
This example was in exceptionally clean condition at the time of sale. All original parts and lacquer were intact, with no signs of previous damage or repair. The precision rotor valve functioned flawlessly—quick, quiet, and reliable—while the handslide was smooth and responsive.
The YSL-640 was designed for players who want the flexibility of an F-attachment but prefer the feel of a medium bore (.525) over a full large bore (.547). This makes it an excellent choice for advancing students, younger players, or comeback players looking for an instrument that is easy to manage but still offers professional-level sound and playability.
Complete with its original Yamaha case and mouthpiece, this horn provided outstanding value and versatility.
This Yamaha YSL-640 is now part of our Archive of Sold Instruments, included here as a resource for musicians and educators researching Yamaha’s medium bore professional models.
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