Bass clarinet. Nominal pitch: B♭.

Technical description: Blackwood with german silver ferrules, crook, bell and keywork. Five pieces: mouthpiece, crook, upper section, lower section, upturned bell. Descending to C₃. Throat B♭ automatic additional vent operated from Akey. Semi-automatic second speaker. Forked E♭₄/B♭₅. Articulated C♯₄/G♯₅. E♭₃ from R4 or thumb. Basset keys linked to low R4keys. 24keys, 7plates. L0: Plate F₄/C♮₆; speaker 1+2. L1: Plate + vent F♯₄; throat A♮; throat A♭. L2: Plate + E♭₄/B♭₅ correspondence. L3: Plate; cross E♭₄/B♭₅. L4: C♯₄/G♯₅; F₃/C♮₅; E₃/B♮₄; F♯₃/C♯₅; G♯₃/E♭₅. R0: E♭₃; D₃; C♯₃, C₃. R1: Plate + B♭₃/F♮₅ via correspondence; side E♭₄/B♭₅; side F♯₄/C♯₆; trills 1-2. R2: Plate + vent B♮₃/F♯₅ via correspondence. R3: Plate + B♮₃/F♯₅ via correspondence; cross B♮₃/F♯₅. R4: G♯₃/E♭₅; E₃/B♮₄; F₃/C♮₅; F♯₃/C♯₅; E♭₃. Keymount type: screwed in pillars. Keyhead type: modern. Repair History: The mouthpiece is a replacement.