Om misverstanden te voorkomen: ik ben een groot voorstander van een correctiemogelijkheid voor de pitch, met name op de schuif vh 3e ventiel. Maar er zijn ook andere opvattingen en niet vd minsten die in ieder geval tot nadenken aanzetten. Zo zag Callet de schuif op her 3e ventiel uitsluitend als een middel om de lage F te kunnen spelen:
Underslung Third Valve Design ~
A craftsman from French Besson had, for many years, urged Jerome to invert the male/female tubing on the 3rd valve slide in order to move the tuning ring to the bottom of the slide in the manner of pre-war French Bessons and vintage Conn 2Bs. In the mid 1990's, Jerry finally found the time to fully test this design. He came to the same conclusion as French Besson - the underslung 3rd valve improved a horn's harmonics, speeded response, increased projection, and significantly improved intonation. By the late 90's, the underslung 3rd value was a standard feature on all Callet trumpets. By the closing of his shop on 2001, Jerry had converted dozens of pre-existing Callet trumpets as well as models from most other makers. For all horns with this conversion, Jerry suggests using the slide only to gain a low F. He strongly agrees with Renold Schilke, Harry Glantz, and the many others who taught that all pitch adjustments should be done solely with the lips. Due to its improvements in intonation, the underslung 3rd valve makes this technique far easier than other designs.
Uit:
http://www.callettrumpets.com/previous_models.htm