Yeah I restrung my guitar with super slinky's and my A string sounds all "tinny" what can I do?

I just bought some "Ernie Ball: Super Slinky"s and I just restrung my guitar and all the strings sound normal except my A string and its producing a tin sound and its really irritating me. So does anyone know what I can do by the way I have a dean strat copy and it has a standard tremolo system if that helps