The YAMAHA YEP 621 is an euphonium known for its powerful sound and precise intonation. Manufactured in China, it provides good build quality and reliable performance.

With its 3 + 1 pistons, the YEP 621 delivers a correct response and allows the musician to play various ranges with relative ease. Its 11-inch (approximately 280 mm) bell and 0.57/0.66 inch (approximately 14.5/16.8 mm) bore contribute to its sound projection, although the tonality may lack depth and complexity compared to higher-end models.

The YEP 621 euphonium is designed to be ergonomic and easy to play. The pistons are relatively easy to operate, offering adequate sealing, although their durability might be a point to monitor over the long term.

The yellow brass finish of the bell contributes to a warm sound, but some musicians might find that it slightly affects the projection and clarity of the sound. However, for enthusiasts and students, it remains a reasonable choice that allows for the development of musical skills without breaking the bank.

In summary, the YAMAHA YEP 621 is an affordable euphonium suitable for enthusiasts and students looking to familiarize themselves with this instrument. While it may have some limitations in terms of tonality and projection, it offers precise intonation and decent playability for progressing in learning the euphonium.