Strony lists this stop with the following description:
This rank was only included in Wurlitzers of 13 ranks or more. In a Wurlitzer, the Brass Trumpet stop tab is merely labeled Trumpet, which is much too generic. Wurlitzer actually built two types of theare organ trumpets: the Brass Trumpet and the Style D Trumpet. The Style D Trumpet is also labeled Trumpet. There are major differences in their tone.
Some authorities identify a third type of Wurlitzer trumpet, the French Trumpet. Al Sefl provided the photograph of the D#52 pipe of a Brass Trumpet, shot against a 1" grid. He believes the pipe to be of Wurlitzer origin, but with subsequent modifications. The resonators have no slots, so the pipes are tuned by sliding the resonators up and down a brass tube which is soldered to the block. In the photograph the slip collar and its locking screw can be seen.
Irwin considers Brass Trumpet to be a synonym for Orchestral Trumpet.See also Trompette Cuivre.
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BibliographyStrony: Brass Trumpet.