Yes, Tina, if you purchase a Lawson lead-pipe, you can get a Lawson mouthpiece that will fit perfectly and match the acoustic. We ream our receivers to the standard 0 Morse taper and make our mouthpiece shanks with the same taper. This is the generally accepted standard, at least in the US. The Selman may be using a different taper or maybe it's just inconsistent crap. I've seen one and it was the latter but it was very inexpensive. That said, they would have to pay me to own one. Our mouthpiece shanks are milled to fit .625" into our lead-pipe. If your mouthpiece is going in more than .5" you may be beyond the venturi. As to fit in general, the lead-pipe receiver wears over time due to inserting and removing the mouthpiece. If it doesn't fit perfectly, it's better that it does not go in far enough rather than too far, as Paul mentioned. It can be difficult to repair worn lead-pipes as the cap does not always come off cleanly in order to swedge it down and then ream it to proper taper. Replacing the pipe is always an option. Another is to put a new, larger shank on the mouthpiece or a thin metal sleeve over the old shank. Mason Jones used the same Kruspe Horn and mouthpiece for many years and had Mr. Dell'Osa lead the shank of his mouthpiece from time to time to keep it fitting properly. Later on, when he met Walter, Walt was able to repair the pipe and put a new shank on his mouthpiece. Some European horns have a larger receiver. It's 0 Morse taper but at a larger angle. The Vienna horn is larger than that. We are making our mouthpieces to that spec as well now and they fit the German makes with the larger hole the same distance as on a US made horn. Back to mangling metal. KB In a message dated 4/30/2009 1:01:00 P.M. Eastern Daylight Time, horn-requ...@music.memphis.edu writes:
date: Thu, 30 Apr 2009 07:13:12 -0400 from: Tina Barkan <tina.bar...@gmail.com> subject: Re: [Hornlist] Receiver size on Selman double horn Paul - You say, "The end of the mouthpiece should ideally come right to the beginning of the ventura. If these line up, they provide a taper that expands from the bore of the mouthpiece to the cylindrical tubing of the horn without gaps or obstructions." If the negative taper can vary from 1/2 to 1" long is there anyway to know for sure that the end of the mouthpiece actually comes right to the beginning of the ventura? If one buys a custom leadpipe does it come with it's own custom mouthpiece? I'm guessing but it seems to me that the length of the negative taper may be one of the specs that custom leadpipe manufacturers change in order to make their great leadpipes. All of the stock mouthpiece manufacturers must be making some assumption about the length of the negative taper and this length may not correspond to the length of the negative taper of a custom leadpipe. Thanks, Tina On Apr 29, 2009, at 11:09 PM, corno...@aol.com wrote: > HI Steve, > > Here is a very basic answer to your question. > > A lead pipe has three primary physical components that are important > to its acoustical design. > > They are: > > A. the negative taper. This is the 1st section (aprox. 1/2 to 1" long) > that the mouthpiece fits into. > > It is called the negative taper because, to accept the taper of the > mouthpiece > shank, the taper measures from large to smaller. This is in opposition > to the main mouthpipe taper, which tapers from smaller to larger. > > B. The Ventura. This is the smallest cross section measurement of > the mouthpipe, > where the negative taper and the main taper meet. > > C. The main taper of the mouthpipe. This is the portion of the > mouthpipe taper that goes from the ventura to the beginning of the > cylindrical tubing. > > > The end of the mouthpiece should ideally come right to the beginning > of > the ventura. > If these line up, they provide a taper that expands from the bore of > the mouthpiece to the cylindrical tubing of the horn without gaps or > obstructions. > > If the mouthpiece goes past the ventura, or not far enough into the > mouthpipe to meet it, response and intonation will generally be > degraded. > > Paul Navarro > Custom Horn > **************Big savings on Dell XPS Laptops and Desktops!(http://pr.atwola.com/promoclk/1001265 75x1219491521x1201306563/aol?redir=http:%2F%2Fad.doubleclick.net%2Fclk%3B214102108%3B35952091%3Bs) _______________________________________________ post: horn@music.memphis.edu unsubscribe or set options at http://music2.memphis.edu/mailman/options/horn/archive%40jab.org
