Willson K56S Euphonium Overview

The Willson K56S K-Series is a professional Bb euphonium built around the familiar three-top-valve and side-fourth-valve compensating layout. Positioned between Willson's non-compensating K46 and the company's higher-priced Q Series and Swiss Pro instruments, the K56S offers an established configuration for brass band, wind ensemble, solo, and chamber performance.

Willson K56S Euphonium Specifications

• Key: Bb
• Valve System: Four-valve compensating system with three top-action pistons and one side piston
• Bore Size: 0.590 inch (15 mm)
• Bell Diameter: 11.5 inches (290 mm)
• Bell Material: Yellow brass
• Finish: Silver plate
• Case: Willson padded gig bag
• Accessories: Laskey 59D large-shank mouthpiece, Ultra-Pure Professional Valve Oil, and polish cloth
• Serial Number: K10142

Condition & Setup

This 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 minor scratches on the bell and near the main tuning slide, including a localized area of scratching and scuffing on a vertical tube. The silver-plated surfaces otherwise present evenly across the instrument.

Who the K56S Euphonium Is For

The K56S is suited to advanced students, experienced ensemble musicians, and professional players seeking a traditional 3+1 compensating euphonium with a large-shank receiver. Its configuration supports the centered, full euphonium concept commonly required in brass bands and wind ensembles while remaining appropriate for solo, chamber, and teaching work.

Common Questions About the Willson K56S

How does the K56 differ from the Willson K46?

The K56 adds a compensating system and uses a larger 0.590-inch bore. The K46 uses a 0.571-inch bore and does not include the K56's compensating system, giving the two models different design goals within the K Series.

What does the compensating system contribute?

A compensating system routes additional tubing into the low register when the fourth valve is used with other valves. This helps address the naturally sharp tendencies of combined valve positions and supports more secure low-register intonation.

What mouthpieces fit the K56S?

The K56S uses a large-shank mouthpiece receiver. This instrument includes a Laskey 59D large-shank mouthpiece, while the receiver also accommodates other standard large-shank euphonium mouthpieces.

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