Author: donald
Date: 2019-12-05 01:06
To begin with - the B and C being flat. This is not typical of these notes, but there are a couple of model clarinets that tend to have this problem. In both cases it is the bell that is the problem- if the bore diameter at the start of the bell is too narrow it flattens these notes. R13 bore clarinets are INTENDED to have this "choke" in the design, however the typical R13 will have slightly sharp B and C. Over the years I have encountered numerous plastic "Selmer USA" students clarinets, and a number of Amati horns- both plastic and wooden, that have a flat B and C that can be helped by enlarging the diameter at the socket end of the bell.
I have an R13 A clarinet where the B was quite flat, another Buffet bell solved this- and measurements showed that in this case, the bore diameter at the top of the bell was the issue. Bell dimensions can vary as well as barrel dimensions!
Making a venting hole, mentioned above, may also help.
As for the left hand chalumeau register (assuming you mean "middle C" through to throat A). As it is currently the top register is sharper than the lower register by 5 to 10c. This is not unusual - it's what is referred to as "wide 12ths" and many clarinets, even very expensive professional horns, have a spread as much as 10c (especially R13 A clarinets!!!!!!). Your manner of tone production will have an influence here, thus different players will get different results and getting used to it may help.
But at the moment your lower register is flat and upper in tune. For many clarinets we live with the lower register in tune and the upper left hand slightly sharp. A different barrel MAY help this (the Moennig bore- or any barrel with a reverse conical bore MAY improve these wide 12ths).
A shorter barrel will bring the throat notes up to pitch (the shorter the tube used for any note, the more the barrel will influence pitch, so a short barrel will sharpen the A more than the middle C).
It may be that for this clarinet a barrel will help close the 12ths, but most likely is that the best is that the 12ths can be closed a bit, but you'll have to live with a slightly sharper "left hand clarion".
btw left hand lower register E is often very flat- and I know people with $10,000 clarinets who have to live with this (opening the C#/G# key raises the pitch, and this can be useful for long exposed notes but not very helpful in scale passages!)
dn
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The Clarinet BBoard
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