Overview
This King 4B straight tenor trombone (SN 629397, mid-1970s) is a beautifully refinished example of one of King’s classic large-bore designs. The horn plays clean and responsive with a smooth .547 slide, straight inner tubes, and excellent alignment. No drag, no rough spots — an easy horn to live with in rehearsal or performance.
If you like the King 3B sound but want more breadth and projection, the 4B is a natural step up. The straight-tenor design gives a very open, lively response while keeping that focused King Sweet Tone core with added warmth and depth.
The horn received new lacquer before arriving at The Brass Exchange and presents very nicely. It’s priced to reflect the refinishing and represents a strong value for players wanting a professional straight tenor without paying new-horn prices.
In stock now and ready to ship.
Player Perspective
Large-bore straight tenors like the King 4B have always been favorites of players who live on .547 tenors or bass trombone and want a straight horn that feels natural in the hands. The size, balance, and response translate easily from symphonic or bass work into jazz, big-band, and commercial settings.
Many legendary jazz players built their sound on large-bore straight tenors — artists like Curtis Fuller and Slide Hampton are classic examples of players who embraced the depth, clarity, and flexibility of the .547 straight-tenor setup.
This particular horn feels very comfortable and quick, with a lively slide and centered tone that works beautifully in section playing or solo lines.
Specifications
• Model: King 4B Straight Tenor Trombone
• Serial Number: 629397
• Era: Mid-1970s
• Bell: 8.5″ yellow brass
• Bore: .547″ handslide
• Slide: Nickel silver with yellow brass end crook
• Mouthpiece: Large shank starter mouthpiece included
• Case: Included
This is the straight-tenor version of the King 4B — same core design as the trigger model, just without the valve section.
Condition Summary
This horn has been refinished with new lacquer before arrival at The Brass Exchange. Cosmetic condition is excellent with a clean, attractive presentation.
The handslide is smooth, properly aligned, and free of dings. Inner tubes are straight with no plating wear or rough spots. The horn plays clean with no drag and very comfortable response.
Fully inspected, cleaned, and ready to play.
Questions Trombone Players Often Ask
How does the King 4B compare to a King 3B?
The 4B is essentially the larger-bore brother to the 3B. It keeps the same focused tonal core but adds warmth, projection, and weight of sound for larger ensembles.
Who typically likes a large-bore straight tenor?
Players who are comfortable on .547 tenors or bass trombone often find these models feel natural right away. They’re popular for jazz, big-band, commercial work, and ensemble playing outside orchestral settings.
What’s included with the horn?
A large-shank starter mouthpiece and its current case are included. The instrument arrives cleaned and ready to play.
Why Players Trust The Brass Exchange 🛡️
Every instrument is inspected and evaluated in-house before listing. Slide alignment, mechanical condition, and real playability are confirmed so the horn arrives ready for rehearsal or performance.
Next Steps
This King 4B Straight Tenor Trombone is available now.
Considering a trade-in toward another trombone? Complete our Trade-In Form ✍️ or browse our current trombone listings 🔎.
