Klarinet Archive - Posting 000036.txt from 2001/12

From: Joshua460@-----.com
Subj: Re: [kl] Tone hole shape
Date: Sun, 2 Dec 2001 23:11:36 -0500

In a message dated Sun, 2 Dec 2001 12:41:41 PM Eastern Standard Time, "CLARK FOBES " <reedman@-----.com> writes:

> Joshua wrote:
>
> "Does anyone know how opening the back side of a tone hole affects the
> tuning, response, and tone of the individual tone and its partials?"
>
> I have a discussion regarding some aspects of tone hole shape in my
> article
> "Tuning and Voicing the Clarinet".
>
> http://clarkwfobes.com/Tuning%20article/Tuning%20the%20Clarinet%20for%20PS.h
> tm
>
> Tone hole shape is very important to intonation as well as tone color,
> clarity and stability. The question regarding the "backside of the tone
> hole" must refer to what I would term the bell side of the hole as opposed
> to the mouthpiece side.
>
> Enlarging a hole towards the bell only will have a very slight affect on
> the pitch of the tone that is emitted from that hole. A common
> misunderstanding is that undercutting or lengthening a tone hole toward the
> bell will make the pitch lower. It will not. A significant enlargement may
> flatten the pitch of the subsequent tone if the hole is close enough. A bit
> of elongation can open up the sound, but there is also often a trade off in
> focus.Generally, enlarging tone holes should be done with a lot of care and
> by some one who has some experience.
>
> Smaller tone holes near the mouthpiece end can feel unstable if the hole
> becomes egg shaped or if the hole is too large.
>
> I am interested to know which tone you want to enlarge and particularly
> what the problem is that you are trying to correct.
>
> Clark W Fobes

Clark,
I am refering to the D/A finger hole (one of the tone holes for E and B). I do not wish to correct anything at all. I was wondering because there is a slight vertical ridge in this hole which runs the entire depth of the hole (not in the undercut portion). At first, I thought it was a scratch, but after looking more closely, it looks more like something created by a drill or some kind of tool. The instrument is a Buffet R-13 Greenline. I am wondering if Buffet or the repairman at IMS may have adjusted the hole. It is very minute. I can barely feel it using a sharp toothpick.

Josh Gardner

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