Willson Q90S Euphonium Overview

The Willson Q90S is a professional Bb compensating euphonium designed for musicians who need a traditional 3+1 valve layout and dependable flexibility across demanding ensemble and solo literature. The Q-Series reflects Willson's established approach to professional euphonium design, while the Q90S pairs that platform with a silver-plated finish.

Willson Q90S Euphonium Specifications

• Instrument Type: Compensating euphonium
• Key: Bb
• Bore Size: 0.590 inch (15 mm)
• Bell: 11.5-inch (290 mm) one-piece seamless yellow brass bell
• Valve Configuration: Three stainless steel top-action pistons and one side piston with compensating system
• Finish: Silver plate
• Case: Willson-branded padded soft case
• Accessories: Laskey 59D mouthpiece, Ultra-Pure valve oil, and polishing cloth
• Serial Number: Q10218

Condition & Setup

This lightly used instrument is in excellent playing order and has been professionally serviced, set up, and play-tested. It is in very good overall cosmetic condition, with scattered fine scratches and small handling marks consistent with normal use. The silver-plated exterior remains bright and reflective overall.

Who the Q90S Euphonium Is For

The Q90S is suited to professional players, advanced students, educators, and serious ensemble musicians working in brass bands, concert bands, wind ensembles, solo repertoire, and teaching studios. Its full compensating system and 3+1 valve layout support low-register fingering facility and intonation, while the large-shank receiver accommodates the mouthpiece format commonly used on professional euphoniums.

Common Questions About the Willson Q90S

How does the Q90S differ from the standard Q90?

The Q90S is the silver-plated version of the Q90. It retains the Q90's Bb compensating system, 0.590-inch bore, 11.5-inch one-piece yellow brass bell, and 3+1 piston configuration.

What does the compensating system contribute?

The compensating system adds supplementary tubing when lower valve combinations are used, helping improve intonation and fingering flexibility in the euphonium's low register.

What mouthpiece format does the Q90S use?

The Q90S uses a large-shank receiver. This instrument includes a Laskey 59D mouthpiece.

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