 The Clarinet BBoard
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Author: Bruno
Date: 2014-07-05 19:35
How much is the natural pitch affected by shortening a barrel from 66mm to 65mm?
From 66mm to 64mm?
thanks . . .
bruno>
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Author: Tony F
Date: 2014-07-05 20:32
I'm not sure that there can be a precise answer to this question, as there are other vectors apart from the length of the barrel. If we take another barrel of a different length then the characteristics of that barrel may be different from the original even though they are to the same design. If we shorten the original barrel then we have altered the dynamics of the barrel. If it was tapered then the tapered section is changed and even if it is not then the resonance characteristics will be altered, if only by the loss of mass.
Tony F.
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Author: kdk
Date: 2014-07-05 20:44
Just to clarify, are you talking about different barrels, or shortening an existing 66 mm barrel?
It occurs to me it *might* make a difference (whether or not the difference would be enough to mean anything, I don't know). Because of the barrel's taper, if you cut one made to be 66 mm, you *might* end up reducing the volume of air inside by more than you would if you used a different barrel made with the same opening diameters as the original 66 (I'm not sure if that's as clear as it could be).
I don't remember ever having a barrel shortened, but when switching barrels, I find very little - maybe 10 cents - difference on the long notes going from 66 to 65. More, of course, perhaps twice as much, at the throat end of the clarinet.
But even with different barrels, the difference in pitch will depend on the bore dimensions as well as the length - the pitch effect is the result of the change in internal volume, not just length. I have barrels of 66 mm and 65 mm that produce identical pitches, presumably because the bore volume of the shorter barrel is equal to that of the longer one.
Karl
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Author: rtmyth
Date: 2014-07-05 21:57
no simple answer, except measurements, maybe.
richard smith
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Author: Caroline Smale
Date: 2014-07-06 00:27
Try pulling out by 1 mm then 2 mm (using spacers if you wish to avoid the distortion created by the gap) and measuring how much the pitch is flattened in each case.
The result for shortening the barrel by similar amount will be pretty close in magnitude but of course in the sharp direction.
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Author: Ken Shaw ★2017
Date: 2014-07-06 05:21
R13s with "F" serial numbers are pitched at 442 for European use. Those without the F are pitched at 440.
Guy Chadash (or perhaps François Kloc) says that the instruments are identical. The only difference is that the F instruments have a barrel 1 mm. shorter.
Ken Shaw
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