The 668 combines the beautiful rich tone and commanding presence the great vintage 'Kruspe' style horns. And adds to it state-of-the-art intonation and playability. The tone is rich, warm and colorful. It can project solos or blend with the section and is so full of life it can fill any concert hall. While the response is quick and easy, and offers excellent control even at pianissimo.

The 668 available in the following configurations:
YHR-668 - Yellow Brass Body with Fixed Bell
YHR-668D - Yellow Brass Body with Detachable Bell
YHR-668N - Nickel Body with Fixed Bell
YHR-668N - Nickel Body with Detachable Bell

Features:

Hand-lapped rotary valves and slides: Rotary valves and slides that have been hand-lapped are airtight and have smooth action.

Articulated key levers: Articulated key levers have responsive motion.

Hammered and annealed bell: Hammering and annealing are processes so important to the instrument's acoustic characteristics that Yamaha employs computer-controlled equipment to ensure consistently superior sound. Hammering enables bells to have a rich, resonant tone that blends beautifully with other instruments. Annealing is a cooling and heating process that makes it easier to control the acoustics of the instrument.

Cyclical bore: A cyclical bore is a perfectly cylindrical tubing assembly in combination with a conical leadpipe and bell system. This allows for consistent air flow throughout the horn.

Tapered valves: Tapered valves wear for a long time without air leakage.

Deep, warm tone colors.

Secure note centers.

Excellent sound in all registers: The combination of the secure high register, strong projection, and quick attack of the Bb horn with the rich, warm timbre of the F horn make the double horn ideal for most playing situations.

For complete details refer to the Yamaha website.