The King 4BF has long been respected as a reliable large bore tenor trombone, offering players the signature clarity and brilliance that King instruments are known for. This late 1970s example is a fine representation of the model, combining professional quality with durability that has made it a favorite for both advancing students and working musicians.
The horn features an 8.5" yellow brass bell paired with a .547 nickel silver handslide, providing a strong, clear voice that projects with ease. The F-attachment rotor adds range and flexibility, making the 4BF suitable for a wide variety of playing contexts, from orchestral work to concert bands and jazz ensembles requiring a large bore tenor with valve.
The handslide on this instrument is in very good condition. It was previously rebuilt with King parts, ensuring longevity and excellent performance. It has been chemically cleaned and adjusted in our shop for maximum playability, and it responds evenly across all registers with smooth action.
This trombone was sold with its original case and mouthpiece, both well preserved. Cosmetically, it shows the expected signs of careful vintage use but retains its classic King appearance and professional integrity.
By the late 1970s, the 4BF had established itself as one of the most versatile large bore tenor trombones on the market. Known for its clarity, power, and reliability, it served countless players as their first F-attachment horn and remains a popular choice for those who value King’s lively sound. Today, new models retail around $2,639, making well-preserved vintage examples like this an attractive option for players and collectors alike.
FAQ 🤔
Q: What is the difference between a King 4B and 4BF?
A: The 4BF includes an F-attachment rotor, giving players access to extended low range notes and greater technical flexibility. The 4B is the straight tenor version without a valve.
Q: What bore and bell size does the 4BF use?
A: It has a .547 large bore handslide and an 8.5" yellow brass bell, placing it in the same category as symphonic tenor trombones like the Conn 88H or Bach 42.
Q: What condition was this example in?
A: Very good playing condition. The slide had been previously rebuilt with King parts, and the instrument was recently cleaned and adjusted for smooth response.
Q: Who is the King 4BF best suited for?
A: It makes an excellent first F-attachment horn for advancing students, as well as a dependable instrument for professionals who appreciate King’s brilliant tone and lively feel.
Q: How does it compare to modern 4BF models?
A: While new 4BFs remain available, many players prefer vintage versions like this one for their craftsmanship, tonal clarity, and long-lasting durability.
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