02/19/2021
Correlation is not causation. How often we hear this; but do we really hear it? I saw a post today from a musician who had his instrument worked on and now believes it is ruined. He had a part replaced, and now it doesn't work properly. How can that be? It was a brand new part. He assumed the new part caused the problem, because he didn't have the problem with the old part. But I looked carefully at what he wrote, and he had ALSO had a different but related part worked on, and I'd be willing to bet that's the actual problem.
Here's an example: A customer came to me and said the valve would get stuck on his sousaphone every time he blew air through it. I was of course skeptical; the air pressure you create when you play an instrument is actually pretty low, not enough to make a valve stick in place. So I asked him to demonstrate, and sure enough, the valve got stuck. I then noticed that the brace holding the leadpipe had come unsoldered. When he went to blow into the instrument, he was of course pushing on the mouthpiece with his face, and that was pushing the leadpipe, and with no brace to hold it in place, was exerting force on the valve casing, distorting it enough to make the valve freeze. Re-soldering the brace fixed the problem.
Sometimes you might think you know what's wrong with your horn, but it might not always be what you think. If you take it in for repair, always explain the problem and let the tech recommend the solution.