Yamaha Xeno YBL-822G double rotor bass trombone

The Yamaha Xeno YBL-822G is a refined version of the earlier YBL-622. Like its predecessor, it was developed with assistance from Douglas Yeo, formerly bass trombonist with the Boston Symphony Orchestra (1985–2012).

It incorporates many small technical improvements with far-reaching results. Crucially, the second valve assembly can be easily detached, converting the instrument to a single-rotor B-flat/F instrument.

• Clear lacquer finish
• Bore: large, 0.563 in. (14.3 mm)
• Bell diameter: 9½ in. (241 mm)
• Gold brass bell
• Dependent/offset valve system (B-flat/F/D)
• Detachable second valve
• Nickel silver inner slide
• Sprung water key
• Mouthpiece and case included

Along with a larger bore and bell diameter, bass trombones are often equipped with a second rotor to extend their low register. There are two double-rotor systems: ‘independent’ and ‘dependent’. An independent system has both rotors sitting side-by-side (or ‘inline’) on the neck-pipe, where they can function alone or in tandem. Dependent models locate the second rotor on the F attachment rather than the neck-pipe, hence the alternative descriptors ‘stacked’ or ‘offset’. In this configuration, use of the second rotor depends on the first rotor being simultaneously engaged.

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Manufacturer’s website: uk.yamaha.com