Sattler's intention was not to create a trombone that would replace the older F and E bass trombones, but rather to provide an instrument with the ability to cover the range of the bass and tenor trombones seamlessly. The tenorbass trombone did replace the older bass trombones, however, and the bore and bell size were increased later in the nineteenth century to allow for models designed specifically to cope with bass trombone parts; modern bass trombones are derivatives of these late nineteenth century B/F trombones that are used to play parts originally intended for the bass trombone in G, F or E. Since engaging the valve changes the tubing length, additional alternate positions for notes become available. The resulting increase in facility and the addition of the low E, D, D, C and B make these instruments popular among experienced orchestral tenor trombonists.