I recently posted about a problem I was having on my deluxe fender jazz. The mid control or small knob was not functioning probperly which led me to discover a completely destroyed pot. Since then Ive had the bass repaired a new pot was installed and the bass works great. However, I am now intriguied by the inner electronics of my bass and just have a few question about parts replacements. Now obviously because my original pot fell apart a new one was need to make the tone work again, I understand that perfectly. Now I have active electronics in my bass so underneath my volume knob is a samll circuit board. My question is are those readily replacable like potentiometers, and were would I go about ordering one(this is all metaphorically speaking of course, my bass is in fine playing condition, Im just curious)? The repair ended up costing me like 35 dollars, and while thats not an extreme amount of money, I try to save money the best I can. Anyway basically I just wanted to know if a part like the small circuit board under my volume control is something that can be purchased from a retailer and be installed myself.