Author: Ken Shaw ★2017
Date: 2007-09-12 21:37
It's 100% certain that the register mechanism is out of adjustment and that the upper register vent (on the neck), or perhaps the vent for the throat Bb, is not closing completely. This mechanism has numerous moving parts, sliding over each other or across cork strips, and it goes out of adjustment all the time on contras.
Finger the middle B and have a friend hold the upper vent closed, and also the throat Bb vent if necessary. This will confirm the problem. Often, you can finger a note and it comes out, but the mechanism binds when you go from one side of the break to the other (that is, raise or lower your right ring finger).
A very small application of cork grease at the sliding points often makes a temporary fix, but you need to get it adjusted by a repair tech to get it cured as close to permanently as possible on the beast.
Good luck at the concert.
Ken Shaw
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The Clarinet BBoard
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