I have gotten a solid chunk of preamps and pickups that were either broken when I got them, or my own begginner stupidity at the time, caused them to break. I have Barcus Pickup and Preamp, the pickup simply needs resoldering to the RCA input jack. I have a King doublebass mag + slap pickup/Preamp system that needs a new output jack and resoldering on the slap pickup, and finally, I have a King doublebass piezo + slap pickup suited for the blue doll head Preamp stompbox, this one most likely needs a new slap pickup and resoldering. Overall, I'd like to know if anyone here is familiar with fixing upright bass pickup systems and how much they would charge to fix these, i'm willing to ship anywhere in the US for repairs, thank you.