Supposedly he had a diode (or something) put in his EB-3 to get that dirty sound he got, I always thought it was from his cranked Marshalls, but I just got it for the heck of it and maybe it will sound good. I wanted the harness anyway so I figured I'd get the one with the Jack Bruce mod for 10 more bucks, it's set up like the Rickenbacker cap, you pull up on the tone and it goes into the circuit and you can control the amount of distortion with the pot, sounds like it will be cool and I can always put the bass back to stock but it's not like it is a pristine 65 anyway, it's been stripped and had a headstock break many years ago.