Jupiter XO 1236L-O Professional F-Attachment Trombone Overview

The Jupiter XO 1236L-O is a Bb/F professional tenor trombone built around an open-wrap F attachment, interchangeable leadpipes, and a standard-weight slide for a responsive, centered feel. Jupiter is a relatively new entry in the professional-model category, and the XO line has earned attention for a dark, blend-friendly tone and quick response across the range. This example was acquired directly from the manufacturer and kept as a lightly used demo/display instrument, offering professional features at an accessible price point.

Jupiter XO 1236L-O Professional F-Attachment Trombone Specifications

• Key: Bb/F
• Bore: .547 inch primary bore; .563 inch F-attachment bore
• Bell: 8.5 inch hand-crafted bell
• Bell Material: Rose brass
• Body Material: Yellow brass
• Leadpipe: Three interchangeable leadpipes
• F Attachment: Open wrap with standard rotary valve
• Finish: Lacquer
• Case: Original Jupiter case
• Accessories: Original accessories including 6.5AL mouthpiece, slide cream, and extra leadpipes
• Serial number: FB04393

Condition & Setup

Condition: Open box (lightly used as a demo/display instrument). We purchased this trombone directly from the manufacturer and it has seen extremely light use. It has been serviced in our shop, professionally set up, and play-tested to confirm slide action, valve function, and overall response.

Who the 1236L-O Professional F-Attachment Trombone Is For

The Jupiter XO 1236L-O is a large-bore Bb/F tenor trombone designed for advancing students, serious classical and jazz players, and working musicians who need the flexibility of an F attachment. Its playing feel emphasizes a dark tonal palette, clean articulation, and strong response, with an open trigger register that supports confident low-register playing and smooth transitions through the attachment range.

What distinguishes the 1236L-O within its category is its open-wrap F attachment paired with three interchangeable leadpipes, allowing players to fine-tune blow resistance and color for orchestra, wind ensemble, commercial section work, or solo playing. For musicians shopping for a professional-feature set without stepping into the highest price tiers, this model is a practical, performance-oriented option.

Common Questions About The Jupiter XO 1236L-O

Is the Jupiter XO 1236L-O suitable for professional use?

Yes. The XO 1236L-O is built with professional specifications including a .547 inch large bore, open-wrap Bb/F configuration, a rotary valve, and interchangeable leadpipes, making it appropriate for gigging and ensemble work where an F-attachment tenor is expected.

What does an open-wrap F attachment change compared to a traditional wrap?

An open-wrap design uses broader bends and more gradual tubing routing, which typically improves airflow and helps the trigger register feel more open and consistent in response, especially in the low range.

What comes with this open-box instrument?

It includes the original case and all original accessories: a 6.5AL mouthpiece, slide cream, and the additional interchangeable leadpipes.

We are proud to be an authorized Jupiter XO dealer