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It's not a defect. Imagine if you were to submerge a ring in soapy water and then pull it out you'd often get a sheet of bubble membrane across the ring. That's pretty much what's happening inside your trumpet valve. When you depress a valve, a bubble membrane made of valve oil can form across the airway that's opening, and when it pops (the oil film is even ...


The shape of the mouthpiece is generally more important than the material, though ebonite/rubber is vastly more common among the better mouthpieces, so I would expect that to be the material of almost any reasonable choice. The real thing you want to figure out is how open you want the facing: There are a variety of other characteristics that can affect ...

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