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Re: Self-taught contrabass

Author: clarnibass
Date: 2010-06-19 07:06

The problem you describe is exactly what several already suggested, the register mechanism out of adjustment. Ken's first post has a description of what should open when. If you have technical sense this is really all you need to know to figure out how the mechanism works and understand where the problem is exactly. If you can't better to give it to a good repairer to fix.

Although the description in Ken's post is basically correct, just to explain one detail more:

>> Finger throat A and press the register slowly. If either of the register vents moves even slightly, it's leaking. <<

For a double, triple, or more register mechanism, it works as Ken said by springs overcoming other springs. But when the register lever is closed it has an even stronger spring close the keys. It has to be (significantly) stronger or else the register key would open when the lever isn't pressed.

When the register key lever is pressed some of the keys are only closed by springs which are weaker than the lever spring. Especially if the pads are relatively soft, it is possible that there is slight movement of the register keys that are not opening, when pressing the register lever. They will not necessarily leak, it is simply the register lever closing will press these keys even harder, crushing the pads slightly more. It is the same thing when you press a closed key with your finger, usually you will be able to push it more. So in the situation Ken described, you might actually see a tiny movement of those keys because of that reason, eventhough they are not leaking at all.

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