Overview
This King 3B Concert Trombone (serial number 582735) was made in the mid-1970s and represents one of the strongest examples of a classic yellow brass 3B from this period.
This instrument remains 100% original, including lacquer and all factory components, with no signs of prior damage or repair. The previous owner acquired it from the original owner and invested in a professional Slide Doctor setup. Ultimately, it saw limited use afterward, and the decision was made to pass it along.
Here at The Brass Exchange, we see a wide range of King 3B trombones—and this is one of the cleanest, most original mid-1970s examples we’ve had in a long time.
It features the desirable “ropy” engraving style, and reflects a transitional era where many of the same craftsmen and build philosophies from the 1950s were still present in production.
Player Perspective
The King 3B has long been considered one of the most versatile and iconic jazz trombones ever made. With its .508 bore and 8" bell, it delivers the flexibility, clarity, and response that define the classic American jazz sound.
This particular instrument plays exactly how a great 3B should:
- Immediate response
- Centered core with warmth
- Effortless flexibility across styles
For advancing players, this is an ideal first professional-level jazz trombone—something that will not need to be “upgraded” later.
For experienced players, this is the kind of horn you keep:
👉 clean, original, unmodified, and musically alive
Condition Summary
This instrument is in excellent playing condition and has been fully inspected and prepared for immediate use.
- Slide: professionally set up by Slide Doctor, smooth and aligned
- Bell and body: original lacquer, no dents or prior repair history
- Components: all original factory parts
- Overall: exceptionally clean example for its era
Includes original case.
Which King 3B Is This? (Quick Reference)
- Model: King 3B Concert Trombone
- Era: Mid-1970s
- Bore: .508
- Bell: 8" Yellow Brass
- Configuration: Straight tenor
- Engraving: “Ropy” style
FAQs
Is the King 3B a professional trombone?
Yes. The King 3B has been a professional standard for decades and remains one of the most widely used jazz and commercial trombones ever produced.
What makes the mid-1970s King 3B models desirable?
Many players and collectors consider this period to be among the last of the classic production era, with continuity in craftsmanship and build philosophy from earlier decades.
What is the bore size of a King 3B?
The King 3B features a .508 bore, making it a medium-bore tenor ideal for jazz, commercial, and small ensemble playing.
Is this a good first professional trombone?
Yes. This is an excellent choice for advancing players looking to move into a true professional-level instrument.
What kind of sound is the King 3B known for?
The King 3B is closely associated with the classic American jazz trombone sound—often linked to players like J.J. Johnson—featuring clarity, warmth, and precise articulation.
Fulfillment & Purchase Options
This instrument is in stock and ready to ship.
- Secure checkout available directly on this page
- Ships via FedEx, fully insured with tracking
- Professional packing and handling included
International buyers: please contact us for a shipping quote prior to purchase.
Trade-Ins Welcome 🔄
Considering upgrading your current instrument?
We accept trade-ins (full or partial) toward this King 3B.
👉 Use the orange Trade-In button at the top of the page to get started.
🛡️Why Players Trust The Brass Exchange
Since 2010, The Brass Exchange has helped thousands of brass players—from advancing students to working professionals—find instruments that truly fit.
Every instrument is:
- personally evaluated
- properly prepared
- and represented with accuracy and experience