Page "Trumpet" Paragraph 18

The pitch of the trumpet can be raised or lowered by the use of the tuning slide.

Pulling the slide out lowers the pitch ; pushing the slide in raises it.

To overcome the problems of intonation and reduce the use of the slide, Renold Schilke designed the tuning-bell trumpet.

Removing the usual brace between the bell and a valve body allows the use of a sliding bell ; the player may then tune the horn with the bell while leaving the slide pushed in, or nearly so, thereby improving intonation and overall response.