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Persistent squeak on Yamaha C100

Author: Tony F
Date: 2024-02-03 16:28

Hi All,
I have a problem Yamaha C100. The problem is that when playing from the lowest note up to C in the chalumeau register the instrument will play in the clarion register as though the register key was pressed, although it is not. Notes above C4 drop to the correct (chalumeau) register. Above the break everything plays normally.
I have been repadding and repairing clarinets for years, so I'm familiar with the process, This clarinet has been repadded with Music Medic medium double bladder pads and adjusted for correct voicing. Joint corks have been replaced There are no leaks and it holds a vacuum well. It is a plastic-bodied instrument, so porosity of the body can be discounted. It should be noted that this problem was present before the instrument was passed to me for attention, and is the reason that it was.
Various combinations of barrel and mouthpiece have been tried without appreciably improving the situation. I've checked the register tube and thumb tube for correct seating and no blockages and the tone holes and tenons are in as-new condition with no flaws or chips.
I've worked on a large number of C100's and this is the only one to exhibit such behaviour. I'm scatching for ideas here, so any suggestions are more than welcome.
Thanks.

Tony F.

Post Edited (2024-02-03 16:34)

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