Hi, I have a question about my Ibanez bass. I bought it used, its a SR 505, and how do I find out how old the strings are. It was made in 95, and the ends of the strings are wound in a purple thread, making me think the strings came from Ibanez itself. I was thinking maybe if I went ahead and changed the strings it might sound better. I have a pack of nickel roundwounds I can replace the current strings with. Thanks!