The Yamaha YSL-644OII is a versatile medium bore tenor trombone, designed with a .525 bore and 8.5" bell—the same bell size as a full .547 large-bore tenor. This makes it an excellent option for players seeking the look and feel of a professional trigger trombone, but in a more accessible bore size.
This instrument (SN 001294) is one we often recommend to students moving up from beginner models. The .525 bore offers less resistance than a .547, making it easier for younger players, developing musicians, or even adult hobbyists to transition into a trigger trombone without struggling with air demands. It accepts a standard small shank mouthpiece, keeping it comfortable and familiar while still delivering a full, rich sound.
At The Brass Exchange, this YSL-644OII received a complete shop service, including a chemical bath and slide alignment. The handslide is free of plating loss on the inner tubes, and plays smoothly. The bell is in excellent condition, with no creases or trauma, though there is some natural lacquer wear consistent with age. The case is original and functional, though the top handle needs replacement (the main carrying handle is intact). An original Yamaha mouthpiece is also included.
Tonally, this model delivers a balanced response—warm and resonant in the lower register, while still projecting clearly in higher passages. It is equally suited for concert band, jazz ensemble, or chamber settings, and remains a favorite “step-up” choice among educators for students not yet ready for a large-bore tenor.
For comparison, new Yamaha 400-series trombones retail around $2,300–2,400, while current 600-series models list in the $2,700–2,800 range.
FAQ
📌 Why choose a medium bore .525 over a .547 large bore?
The .525 bore provides an easier response for developing players or those who prefer less resistance. It bridges the gap between student horns and professional large-bore tenors, offering flexibility without the full air demands of a .547.
👉 Is this model suitable for students?
Yes. It’s an excellent upgrade from a beginner trombone, offering professional features and sound while remaining accessible for middle school, high school, or adult players.
What is included with this trombone?
The YSL-644OII came with its original case and mouthpiece. The case remains functional, with the main handle intact but the top handle in need of replacement.
📌 This Yamaha YSL-644OII has been sold and is now preserved in our Archive of Sold Instruments. Looking for similar models? 🔎 Browse available trombones at The Brass Exchange
