Posted by Arnie Rosen on December 23, 2003 at 14:57:32:
I have finally made a diagnosis, and now seek advice regarding treatment.
After meticulously bathing the instrument, removing all slides/valves/springs, I now realize that the annoying buzz I hear with certain pitches is from the horn's bell. If I pinch, with my fingers, the rolled edge of certain portions of the bell's circumference, I can eliminate the sound.
Now what? The advice of seasoned repair folks will be much appreciated.