This King 6B Duo Gravis bass trombone is a standout example of the model produced in the 1970s. It features a 9.5" yellow brass bell, standard King nickel silver handslide, and dual dependent rotary valves. Designed for serious bass trombonists, this model offers classic American craftsmanship with a modern performance edge.
A key upgrade on this particular horn is the split valve linkage—professionally modified from the original single-lever design. The result is a more comfortable, ergonomic feel that players adapt to quickly.
The lacquer is original and well-preserved, with no history of major repairs. The handslide is responsive and well-aligned, providing that classic King feel—quick, fluid, and centered. For players coming from King 2B or 3B models, the transition to this 6B feels natural and familiar.
This trombone delivers a rich, clear tone with excellent projection and valve response, making it a great choice for jazz, commercial, and pops settings. It blends well in ensemble playing yet still has the power to stand out when needed.
Includes the original case in good condition.
What makes the King 6B Duo Gravis a sought-after bass trombone?
The 6B Duo Gravis became one of the most respected bass trombone models made in America during the 1970s. Its unique blend of warmth, focus, and playability made it a favorite among jazz and crossover players.
Are the split valve levers original?
No — this horn was upgraded with split levers for improved ergonomics. It makes valve transitions more intuitive and brings the feel in line with modern dual valve bass trombones.
Is the 6B suitable for players used to small bore King trombones?
Absolutely. The 6B retains the same smooth slide action and responsive bell as smaller King horns, making it ideal for players moving into bass range without sacrificing familiarity.
This King 6B Duo Gravis has been sold and is now shown here in our archive of historical trombones.
👉 Browse available jazz and symphonic trombones in stock
