Yamaha YEP-321S Euphonium Overview

The Yamaha YEP-321S is an intermediate Bb euphonium built for advancing players who need consistent response, centered tone, and durable band-room reliability. This instrument is brand new, includes the full manufacturer’s warranty, and is sold by an authorized Yamaha dealer. The YEP-321S features a .571 inch bore, an 11 inch upright yellow brass bell, and a small shank receiver for easy tone production and comfortable response as players build range, control, and endurance.

Yamaha YEP-321S Euphonium Specifications

• Key: Bb
• Finish: Silver plated
• Bore: .571 inch
• Bell: 11 inch, upright
• Bell material: Yellow brass
• Valves: 4 top-action, nickel plated
• Leadpipe: Gold brass
• Valve casing material: Yellow brass
• Case: Hard case
• Accessories: Yamaha 48M small shank mouthpiece, valve oil, cleaning cloth

Condition & Setup

Brand new with full manufacturer’s warranty. This euphonium is inspected and play-tested by our professional brass staff prior to shipment to confirm proper function and valve action.

Who the YEP-321S Euphonium Is For

The Yamaha YEP-321S Euphonium is a 4-valve, top-action Bb euphonium designed for advancing students and ensemble players who want reliable intonation, efficient response, and a familiar small shank mouthpiece setup. The .571 inch bore and small shank receiver help support easy tone production and clean articulation, making it a practical step-up choice for players moving beyond entry-level instruments.

Within Yamaha’s euphonium lineup, the YEP-321S is widely used in school bands and community ensembles because it balances straightforward handling with the added range and facility of a 4th valve. The silver-plated finish, gold brass leadpipe, and durable valve materials are specified for longevity and consistent feel under regular use.

Common Questions About the Yamaha YEP-321S

Is the Yamaha YEP-321S a professional euphonium?

The YEP-321S is best classified as an intermediate (step-up) euphonium. It is a common choice for serious students and ensemble musicians, while many full-time professionals typically choose a larger-bore, compensating euphonium for maximum tonal breadth and low-register intonation control.

What mouthpiece shank does the YEP-321S use?

The YEP-321S uses a small shank receiver and includes a Yamaha 48M small shank mouthpiece. This is a standard configuration for many student and intermediate euphoniums and is often preferred for ease of response.

What is included with the Yamaha YEP-321S?

The YEP-321S includes a hard case, a Yamaha 48M mouthpiece, and valve oil. It is brand new and includes the full manufacturer’s warranty.

We are proud to be an authorized Yamaha dealer