UEDIN · 6674
Tenor/contrabass trombone. Nominal pitch: 9-ft B♭ and 18-ft B♭.

Description
Technical description: Silver-plated brass. A tenor trombone with a thumb valve that doubles the sounding length. A second slide can optionally be moved with the main slide allows the instrument to be played as a contrabass using the same slide positions as for a tenor trombone. The valve loop, apart from the auxiliary hand slide, is demountable and is detached for transport. Lock for auxiliary slide to keep it from moving when played in tenor mode. With lever air release key for auxiliary slide and water keys on main hand slide (siphon), auxiliary hand slide (lever), and valve loop (lever). Valve type: Single Périnet valve for L1, bottom-sprung, alignment by key on piston engaging with channel in casing interior.
Measurements
from bell bow to siphon, 1155; bell 160.