So I bought this Conn 18B ( Coprion Bell ) about a year ago. Then I try it out and the 2nd valve produces a terrible closed off tone. Any combination using the 2nd has a slightly less terrible tone. I didn't see anything on a quick check. 2nd slide is clear....2nd valve lines up well...valve spring/cap switch is the same lousy sound. It is a good looking horn with original case ( latches even work ). But, she don't play very nice at all. She's soaking in the sink now. Any ideas guys ?