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Bottom C# has become difficult to hit

Profusia

Senior Member
Messages
1,019
Locality
Worcestershire
So my curvy sop's bottom C# has become somewhat unreliable and a tadge unstable. If I go to it from a neighbouring note I can usually get it. But trying to jump down to it from any sizeable interval is hopeless. Bottom D and C are fine. I'm wondering if the bottom C# could be over-venting. I've never changed the felts and they really do need doing so I could well believe it could be something like that. Any other ideas?

Next question... Best place to read up on, or watch a good video on, DIY changing felts? :)
 

GJ77

Senior Member
Messages
775
Locality
Dunmow, Essex.
Check th the g# key is remaining fully closed (it should be held shut by any of the rh stack, courtesy of a little linking arm).
 

Colin the Bear

Well-Known Member
Messages
14,940
Locality
Burnley bb9 9dn
Trouble down low can be a leak up top. Fixing what's not wrong is an endless task.
Could be Bis, G#, rh stack regulation, lh pinky table, C pad leak, neck cork leak, mouthpiece position. Also dirty mouthpiece internals or bore. Duff reed.

Soprano is so small. I need to put my reading glasses on to inspect it.
 

Stephen Howard

Well-Known Member
Messages
3,098
Locality
UK
Check th the g# key is remaining fully closed (it should be held shut by any of the rh stack, courtesy of a little linking arm).
I think this is the most likely cause. Low C# is a pretty robust note - like all the others that speak when a key is raised.
There's really not a lot to go wrong. If the notes above and below work fine, there's usually no reason why an intermediary note should cause problems.

The standard check for a misregulated G# is to play a soft/subtone low D or C and press the G# key down. If the tone changes in the slightest (usually gets weaker), you need to tweak the adjuster above the G# key cup a little.
 

Profusia

Senior Member
Messages
1,019
Locality
Worcestershire
Thanks everyone. I'll experiment with the G# key and cup for starters and report back if it proves to be the issue.
 

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