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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 ...


1

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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