- Very popular bass trombone for big band, jazz, musical, or pop.
King 6b Duo Gravis Bass Trombone 1977
King 6b Duo Gravis Bass Trombone 1977
Out of stock
Out of stock
incl. VAT excl. shipping







- Very popular bass trombone for big band, jazz, musical, or pop.
Workshop-tested instruments
30-day return policy
2 year guarantee
Fast, CO2-neutral shipping
Here for sale is a used King 6b Duo Gravis bass trombone. A brilliant bass trombone. Comparable new instruments cost 4.000-5.000€.
About the history of this great instrument:
King is one of the world’s largest and most recognized manufacturers of brass instruments.
The trombone offered here is a “Made in USA” instrument.
The high build quality of the instrument can be seen and felt immediately.
Many great “trombone heroes” such as J. J. Johnson, Kai Winding, Ed Neumeister, Adrian Mears, Jiggs Whigham and many others play a King.
It was built around 1977 and recently overhauled by us for you.
What makes this professional King bass trombone stand out:
- Fat, crisp sound, especially great for big band, jazz, pop and musical.
- The train is running great. No abrasion.
- The pull is cylindrical with a 14.3mm/ .562″ bore. The bell is 241mm/ 9.5″ wide.
- Yellow brass bell, nickel silver slide.
- The two dependent rotary valves have the tuning Bb/F/D
- As a lubricant, I recommend Slide-O-Mix Rapid Comfort for this 6b.
- The serial number on the bell is 671XXX, which is circa 1977.
Condition of this King after intensive examination:
- The train is running well. No abrasion.
- The tuning slides are freely movable
- The valves are tight and move quickly and quietly.
- Stop felt is available.
- Rubber stopper / parquet protector is present.
- The instrument is in good condition.
- Beautiful curved “Duo Gravis” engraving
- The bell itself is stripped of its varnish, the tuning slide bows have gold varnish. This has some signs of use.
- The grip points are also in super condition.
- The instrument was recently overhauled by us and is now immediately optimally playable.
I am a professional musician myself and have tested this trombone intensively and found it to be in perfect condition. That is why we also give 2 years warranty.
Included accessories:
- The instrument in the original King case.
- The 6b Duo Gravis is a legendary bass trombone that shines with a fat, crisp sound.
- As a lubricant, we recommend Slide-O-Mix Rapid Comfort for this 6b.
- The instrument should be cleaned regularly from the inside, e.g. with a Reka care set.
That’s why Elbblech – safety, quality and warranty services:
- 30-day return policy.
- 1 year warranty, 2 years guarantee
- Free shipping and return shipping
- If you have any questions, feel free to drop me a line or get in touch.
OUR TEAM








– Yes, by appointment in Ratzeburg. There is no shop.
– That’s me, Felix Eilers, a professional trombonist by trade. I studied in Hanover, Rotterdam, Groningen and New York City and have a master’s degree in jazz trombone.
– Yes, that is possible without any problems. When purchasing the instruments, you always have a 30-day right of return. During this time you can try the instrument in peace and, if you don’t like it, send it back without giving a reason. Please ALWAYS contact us before making a return. Thanks !
– Yes, feel free to contact me via this page if you have something to offer.
– Yes, I can be reached at +49 176 576 10 172
– Generally not, as mouthpieces are a highly individual matter. If a mouthpiece is included, I write it explicitly in the item description. If you need a mouthpiece, I have a large selection. If you have any questions, please contact me.
– As a rule, all instruments are overhauled and / or workshop serviced. I only sell instruments that are in such good condition that I would use them professionally myself. If an instrument is not directly playable, I will clearly state this in the item description.
– I deal in instruments that I am enthusiastic about myself and that I can recommend with a clear conscience. These are almost exclusively professional series from the largest and most exquisite manufacturers.
– Yes, in the past I have shipped to almost every country in the EU, Russia, the USA and Asia. If you have any questions about shipping, please get in touch.
– My customers say: “Yes !”. On Ebay, for example, I have over 300 positive reviews, 100% of which are positive and 5 stars in all subcategories. As a professional seller and trombonist, I make every effort to ensure that you, the customer, are satisfied.
Feel free to contact me with any questions.