The great thing about the Shure V15 series is they're pretty neutral; that is, they don't pump up any frequencies at the expense of others. Some prefer the model you have, the V-15 III, to the more recent versions. That said, the III's need some attention to sound their best. They prefer an extremely lightweight arm and interconnects with extremely low capacitance. I'm not familiar with your Yamaha TT, but if it's from the mid-80's it's probably a great match with the Shure.