Hey guys, I'm just a beginner... but I recently tested the valves for air leaks and I found some air leaking in all 3 valves. This is a used King 600 trumpet! Is this normal to have some? I'm not sure if my tone sucks because of my embrochure or the valves. Is there a way to check if the valves are worn? Thanks I did a search, but I didn't really find anything other than how to check if there's an air leak. Btw! forgot to add... I brought it in to my music teacher at school. He plays trumpet and he played it and said it was fine, okay, or good enough for a beginner or something along those lines haha.