Author: jdbassplayer
Date: 2019-02-15 15:58
If you don't mind doing some modifications to your instrument then it may be possible. As far as being out of tune, 10 cents is nothing, especially for the low F. On some instruments this can be as much as 20 cents or more.
There are two main factors in play that determine how the registers will line up with one another. The shape of the bore and mouthpiece chamber and most importantly the location and size of the register vent. Ideally you want one register vent for every note, however this would be far too impractical for real world applications. Instead the location of the register vent is a compromise. In order to compensate for this, the register vent must be longer and have a smaller diameter. The first thing I would do if intonation was your main concern is to get a slightly longer register tube, or one with a smaller diameter as the Festivals have. Then the clarion C should be flatter, so you will now need to undercut the tonehole. A hole in the bell would also be a good idea as if you bring the C down the B will come down with it. If you do this right, the low F will be better, although still not perfect. Also now your throat Bb will be flatter, although on many instruments the Bb is already a bit sharp so this may not be as much of a concern. You can sometimes fix this by raising up the register key pad, although this may not always work and you may need to relocate the register vent up a bit.
-Jdbassplayer
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The Clarinet BBoard
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