Working around heavy machinery, shooting guns, riding motorcycles, drinking too much coffee all contributed to my having mild tinitus. Luckily, my hearing doesn't seem to be diminished, though my girlfriend claims I have a slight case of "male selective hearing." Wonder if it's related? In any case, a little tinitus is like a bit of tube rush; it's just a sign the equipment, though maybe not state of the art, is still "the good stuff."