This listing is for an E.K. Blessing B-88-O (often designated as the BTB-88-O) large-bore tenor trombone with an open-wrap F-attachment in excellent condition!

Serial number: 522864 (dates this instrument to 2002)

Manufacture location: Elkhart, Indiana, USA

Mechanical Specifications

The B-88 series was heavily inspired by classic American large-bore tenors—specifically borrowing design elements from the Conn 88H—and manufactured using much of the same classic Elkhart tooling.

Bore Size: 0.547" Large Bore

Mouthpiece: Standard large-shank (Morse taper) Blessing 6½AL (included)

Bell Diameter: 8.5 inches

Wrap Style: The "-O" in B-88-O designates an Open Wrap F-attachment pathway. Compared to the standard closed/traditional wrap B-88, the open wrap features larger bend radii and fewer tight turns, reducing backpressure and offering a freer-blowing feel when engaging the F-rotor.

Valve Mechanism: Traditional rotary valve mechanism operated via a mechanical linkage

Materials & Construction

Bell: A high-copper-content yellow brass or rose brass bell

Handslide: Chrome-plated nickel-silver inner slides with a yellow or rose brass outer slide casing and a nickel-silver end bow for added durability

Playability & Tonal Profile: The B-88-O is widely considered an excellent "gateway" large-bore horn. It offers a broad, warm, orchestral sound capable of producing rich low frequencies in ensemble settings (orchestra, wind ensemble, brass choir) without requiring the higher price tag of a Bach 42T or Conn 88HO.