Re: intonation repair


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Posted by mike teague on February 12, 2003 at 09:23:33:

In Reply to: intonation repair posted by Dave on February 12, 2003 at 02:05:39:

I recently worked on a cut horn which had a flat 3rd partial. By changing the taper in a certain trouble spot I was able to get the 3rd partial to come up to pitch. The problem is that pitch can be changed at the node or anti-node so if you want to change a given partial there are a number of places to do it. The increasing bore of a horn tends to make the nodes and antinodes spread out and often a node of one pitch falls close to the anti-node of another. I remember reading a publication from Conn where they talk about lowering the 3rd partial on their tubas to raise the 5th. That of course happened because the node of one pitch was so close to the anti-node of the other. They,however, felt this was a good trade-off. If you are interested, there are a lot of things written about sound waves in a straight tube. Just remember to enlongate the pattern in proportion to the increase in bore.


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