 The Oboe BBoard
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Author: OboeGoldCoast
Date: 2015-09-03 00:54
Hi All
I have a Marigaux M2 that has being getting more and more out of tune on the flat side and both F are getting really bad. I have try all the usual suspects, Reeds, Staples, Pad height, but no luck I also have 901 which with the same reeds is very much in tune.
Looking on the clarinet board one person was talk about plaque in the tone holes affecting the pitch and how someone would remove it and the instrument would play as good or better than new again.
So I took of the forked F key off to find the bore is has full of light brown layer stuff that can be move it with a small plastic screw driver little by little from the tone hole.
My question what would the best way of remove it from the bore as it must be in other parts of the bore without damaging the bore, also the tone for the holes? Is there some kind of polish that can be applied as well.
What I am thinking is pull all the keys off clean out all tone holes, get a USB Endoscope Camera from ebay inspect the bore from the inside find the problem areas and brush out the bore with lots of different size bottle brushes and elbow grease but would that be too harsh for the bore, any other ideas are welcome thanks.
I am ok with doing the work myself as I have pull apart oboes many times before including re padding.
By the away I swab out the oboe ever time I use it. The 901 does not have the problem as it was made back in 70’s and has a very high finish in the bore unlike the M2 which does not look like it was finished in the same way. I read on the clarinet board that to make the tone darker the non polished finish is better but the side effect is more open grain to collect stuff would this be true on the oboes as well or is this just a sign of the time’s with wood quality.
Thanks
Nicholas Taylor
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Author: JRC
Date: 2015-09-03 01:10
Plague on the surface of the bore in side would make the ore "smaller". I thought a smaller bore (bore shrinking by old age or drying out the wood) would sharpen the pitch. The opposite, enlarging bore by the same process, would flatten the pitch. I do not know which happens normally. Middle joint of my old oboe shrunk and sharpened and had to adjust the under cuts to correct the pitch.
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Author: cjwright
Date: 2015-09-03 10:08
Wait... Making the bore smaller will flatten the pitch, not sharpen. Reaming the bore to be bigger will make it sharper.
For all intensive purposes however, tuning an instrument is far more complicated than just "bigger bore, smaller bore." There's acoustical nodes that are related from top to bottom that I dare not venture into because it involves math and science and smart stuff that I am not capable of...
Blog, An Oboe In Paradise
Solo Oboe, Thailand Philharmonic Orchestra
Post Edited (2015-09-03 10:10)
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Author: OboeGoldCoast
Date: 2015-09-03 11:39
Hi
I think you are both right about the pitch with the bore width. It could be just at mater of where the bore has changed .
Eg if you widened the bore around the A key I would think that notes above A would be high pitch being C B B flat. But the note / notes lower than G may be flatter as have change the taper bore thus having the effect reducing the bore. That my guess on it.
The problem is if I can see guff in the bore that has built up over time even after swabbing after use the tone hole would by default have more guff as the swab just push it along the bore to a tone hold or out the end.
Anyway it’s still about the best way to clean the bore out with any bore damage.
Thanks Nicholas
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