Overview
This Yamaha YSL-644OII is a good, honest, fully serviced medium-bore tenor trombone. It has the full 8.5" yellow-brass bell normally seen on .547 large-bore pro horns — but the .525 bore makes it easier to play, especially for advancing students and adults returning to music.
Before the Xeno 800-series existed, the 600-series was Yamaha’s top line. Changing a model name doesn’t change the musical reality — and this horn still plays the part.
Now archived — this sold instrument remains visible as part of our Archive of Sold collection. 📣
Full Shop Service Completed
This instrument has undergone a complete professional service, including:
Full chemical bath – flushed and cleaned throughout
Rotor removed, cleaned, polished, and lubricated
New bumpers and play tested
Handslide alignment – slide is very straight
Gravity-fall test – slide moves freely under its own weight
No inner-slide plating defects
No red rot in slide tubes or crook
Bell is dent-free, with no crease history
Result: clean response, predictable slotting, and a feel that lets you focus on playing — not the tool in your hands.
Value in Today’s Market
To help frame this instrument:
A new Yamaha YSL-446G (intermediate, no F-attachment) lists around $2,771 in 2025
A current Yamaha YSL-620 / YSL-640 (modern medium-bore equivalents) list between $3,100 – $3,200 in 2025
This fully serviced YSL-644OII, originally a top-line Yamaha, is offered at $1,095
You can spend more — but don't always need to.
Many families get told to “just get a trigger trombone” — often by people who don’t play trombone themselves — and that advice can unintentionally push parents toward spending far more than they need to.
Who This Fits Best
Young advancing players stepping up from their first student horn
Adults returning to playing who don’t want heavy weight or large-bore air demand
Anyone who wants a real professional-level instrument without overspending
A medium-bore .525 often sits in the sweet spot between comfort and tone — it gives support and flexibility.
Included
Yamaha YSL-644OII medium-bore tenor trombone
Small-shank mouthpiece (included)
Original Yamaha case (good condition – exterior stickers present)
📸 Condition-Preview Note
Photos on this page are arranged so you can see what matters — slide alignment, bell surface, lacquer, and engraving — before you even reach out.
Next Step
If this feels aligned with where you're headed, simply add to cart — it will ship FedEx the next business day, professionally packed and ready to play when it arrives.
Prefer to talk first? Call or email — conversation is always welcome.
🔎 Prefer to research before deciding? View similar Yamaha models on our Archive of Sold — compare, learn, and decide with confidence.
Why Players Trust The Brass Exchange
🛡️ Since 2010, players across the U.S. and internationally have trusted The Brass Exchange for honest condition descriptions, full pre-sale service, and instruments that play properly when they arrive.
