Jupiter XO Model 1236L-T Tenor Trombone with Thayer Valve SN EB11935

Jupiter XO 1236L-T Trombone Overview

The Jupiter XO 1236L-T is a professional .547 bore symphonic tenor trombone featuring a Thayer axial flow valve designed to keep the trigger register exceptionally open and responsive. Jupiter’s XO line has become a serious option for advancing and professional trombonists who want a dark, centered tonal color, secure response, and modern valve feel at a practical price point. This instrument was a display model and is being offered as an open-box purchase from an authorized Jupiter dealer.

Jupiter XO 1236L-T Trombone Specifications

• Instrument type: Tenor trombone with F-attachment
• Bore: .547
• Valve: Thayer axial flow (open wrap)
• Key: Bb/F
• Finish: Lacquer
• Leadpipe: 3 interchangable leadpipes
• Bell size: 8.5 Inches
• Case: Original
• Accessories: 6.5AL Mouthpiece, Rotor Oil, Slide Cream, Polish cloth

Condition & Setup

Condition is open box (display model). The instrument shows no signs of use and presents in like-new cosmetic condition. Prior to shipping, it will be professionally serviced, set up, and play-tested to confirm proper slide action, valve alignment and function, and overall playing performance.

Who the 1236L-T Trombone Is For

The Jupiter XO 1236L-T is a professional symphonic tenor trombone built for orchestral, wind ensemble, and demanding commercial section work where a broad sound and a free-blowing trigger register are priorities. Its .547 bore and Thayer axial flow valve support a dark tonal character with quick response, and the valve design is specifically chosen to reduce resistance when the F-attachment is engaged. For players comparing professional F-attachment trombones, the 1236L-T stands out for its open feel through the valve and its strong performance-to-cost value in the pro category.

Common Questions About The Jupiter XO 1236L-T

What does the Thayer valve change compared to a rotary valve?

A Thayer axial flow valve is designed to keep the air path straighter and more open than many traditional rotary designs, which typically makes the trigger register feel less resistant and closer to the open horn.

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

Yes. The XO series is Jupiter’s professional line, and the 1236L-T is built as a .547 bore symphonic tenor trombone with F-attachment intended for advanced conservatory study, audition prep, and professional ensemble playing.

What does open box mean for this instrument?

Open box means it was a display model rather than a regularly used instrument. It shows no signs of use and will be inspected, set up, and play-tested before it ships.

We are proud to be an authorized Jupiter XO dealer

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We want you to be happy and satisfied with your purchase, and we offer an unconditional 30 day return policy. If you are unhappy with your item for any reason, just return it for a full refund or full credit towards an exchange. (Reeds and other consumables are non-returnable once opened.)

We warranty every item we sell to be free of mechanical defects. If you find an issue with your purchase, please contact us. We will either reimburse you to have any minor repairs completed by your local repair shop, or we will send you a label to cover all return postage charges so that we can either repair your instrument, exchange your instrument, or issue you a refund for your instrument. We stand behind our products, and we truly want you to be happy.

Please note that if you simply change your mind about the purchase of an item - if you find that it's just not the one for you - you are still entitled to a full refund. We do not routinely charge a restocking fee; however, you will be responsible for the expense involved in shipping the item back to us if you have not purchased free returns through Redo at checkout. (Redo is available for domestic sales in the US only - international customers will be responsible for return shipping). Upon receipt of your return, our technicians will go over the instrument to ensure everything is in the same condition in which it was sold. Damage to the instrument, missing accessories, or unauthorized alterations/repairs may affect your refund. Your refund will be processed within 5 business days of our receipt of your return.

If more than five returns are requested within a calendar year, a 20% restocking fee will be assessed for every return moving forward for that calendar year.

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