Vincent Bach 42BO B-flat/F tenor trombone

The ‘42B’ trombone emerged in the early 1950s as part of Vincent Bach’s expansion into large-bore symphonic tenor production, building on the manufacturer’s established medium-bore models. Featuring a .547-inch bore, 8½-inch one-piece yellow brass bell, and traditional wrap F-attachment, it offered a focussed, projecting orchestral sound distinct from the broader tonal profile of its competitors. While not initiating the large-bore movement, the 42B became a durable standard in American orchestral playing, and continues to influence contemporary Bach trombone design.