Author: Wes
Date: 2010-07-25 19:47
Sahl Spano said he often saw this problem on older Lorees but I don't have it on my Loree oboes.
This problem is on both of my English horns(plus Ab) and is fixed only with fingering changes as bocals don't cause this kind of problem. It is also present on my great Bulgheroni oboe d'amore, also fixed by fingering changes. Reed changes don't seem to help.
The reason for this kind of instability or intonation problem is because the unused bottom half of the oboe has a low-Q resonance(due to holes being open) that affects the resonance of the top half to G2. It can increase the amplitude of the G2 if the resonances are the same or it can pull off the frequency of the G2 if the top and bottom resonances are slightly different.
Try the oboe with the bell removed and see what happens.
Note that it does not occur with G1 which follows from the above discussion.
One can speculate that certain instruments avoid this situation by having different bores or hole sizes, placing the lower half resonance at a different frequency. Good luck with this!
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