I just bought a beautiful 2006 Mexican Stratocaster. ($325.00) The Bridge pick-up is a Seymour Duncan Hot Rails. Without pulling the pick guard, how do I tell if the other two pick-ups in my Strat are ceramic or alnico? Is their a simple test other than sound? (sound can be deceptive). Note: The guitar is set up perfect and I do not want to re string. Still, it would be nice to know what I bought. Thank you in advance.