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 Bassoon problem
Author: MDFP 
Date:   2013-07-23 20:20
Attachment:  Antes e Depois Peq.jpg (210k)

Hi everyone.
Last week I completely restored a Selmer Signet Soloist Basoon.
Everything looks and sounds perfect but from low E to low A.
Every time those notes are played with a bit more air, right away it "jumps" to the harmonic in the upper octave.
If pinky F# key is squeezed with something, like a rubber band or a wood wedge, the bassoon plays correctly.
The hole has been checked and refaced, the spring has been strengthened and I tried with both sheep skin and synthetic pads.
Nothing seems to solve the problem.
If a key were not sealing properly should not play well below low E (I think).
Any one has an idea on what can be happening?
I'm going crazy with it (a bit more)...
Thank you and hope someone can help me.


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 Re: Bassoon problem
Author: Ian White 
Date:   2013-07-24 09:17

This really does point to a leak on the pinky F# - is the pad really seating well with even pressure all round when checked with a feeler? Does the spring on the pinky F# touch the hinge tube of the key anywhere? Does the key operate freely when the spring is not attached to the key?

You can get funny effects on random notes from leaks much higher up an instrument. Is the wing joint sealing well? Is there a leak on the ring key pad on the butt joint?

Good luck. Ian

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 Re: Bassoon problem
Author: Ian White 
Date:   2013-07-31 15:32

Have you cracked the problem yet?


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 Re: Bassoon problem
Author: Ian White 
Date:   2013-08-09 15:08

Another source of odd results can be a leak between the holes on the Bb on the boot joint. The only way to check for this is by vacuum or pressure testing the two bores indepedently of each other.

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 Re: Bassoon problem
Author: Wes 
Date:   2013-08-13 05:27

The bassoon can leak through the wood to the flat over the tonehole. These areas are often sealed with shellac or lacquer, but you may have already sealed it there. There can even be leaks to a trademark through the wood. It sounds like you have more leak detection work! Good luck!

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