Willson Q90S Q-Series Professional Bb Euphonium Silver Plate SN Q10122

Willson Q90S Euphonium Overview

The Willson Q90S belongs to the company's Q Series, pairing Willson's established euphonium-making tradition with a professional 3+1 compensating design intended for demanding ensemble and solo work. Its design supports the centered response, tonal breadth, and low-register control sought by serious euphonium players, while the silver-plated configuration carries the Q90S designation.

Willson Q90S Euphonium Specifications

• Key: Bb
• Valve Configuration: 3 top-action pistons and 1 side-action compensating piston
• Bore Size: .590 inch (15 mm)
• Bell Diameter: 11.5 inches (290 mm)
• Bell Material: One-piece seamless yellow brass
• Finish: Silver plate
• Case: Willson-branded padded gig bag with shoulder strap
• Accessories: Laskey 59D large-shank mouthpiece, Ultra-Pure valve oil, tuning-slide lubricant, and polish cloth
• Serial Number: Q10122

Condition & Setup

This used euphonium is in excellent playing order and has been professionally serviced, set up, and play-tested. The silver-plated surfaces remain bright overall, with light hairline scratches and handling marks around portions of the valve section and lower bow. Minor localized scuffing is present along the lower edge of the bell rim.

Who the Q90S Euphonium Is For

The Q90S is best suited to advanced students, collegiate musicians, professional players, and serious brass band or concert band performers seeking a full-size compensating euphonium. Its 3+1 system provides the extended low-register facility and intonation options expected in advanced euphonium literature, making it a practical choice for ensemble, solo, audition, and teaching work.

Common Questions About the Willson Q90S

What does the compensating system contribute?

The compensating system redirects air through additional tubing when the fourth valve is combined with other valves. This supports more accurate intonation and a complete chromatic range in the euphonium's low register.

How does the Q90S fit within Willson's euphonium range?

The Q90 is Willson's Q-Series 3+1 compensating euphonium, positioned as a performance-focused instrument for advanced and professional use. The Q90S designation identifies the silver-plated version.

What should a player expect from the bore and bell dimensions?

The .590-inch bore and 11.5-inch upright bell place the Q90S within the familiar full-size compensating euphonium format. This combination is designed to balance tonal breadth, projection, and manageable resistance across the instrument's range.

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