I've been chatting with a guy who is selling his late-sixties Fender Precision. He's apparently selling it for $300... BUT it seems as though it doesn't have the original pickups. From the picture the pickups look the same, but he described some modified feature where you pull the volume knob up and it initiates some kind of active, battery-powered boost. My questions... Is it possible that these could be the original pickups, just modified? If they are NOT the original pickups, how badly would it devalue the bass?