This may have been posted before but just came across an interview with Jason Lollar. In the unlikely event you don't know who he is, he's the guy who wrote the book on pickup winding. It's a really interesting article and well worth a read, the part
Just seen these on Ebay and wondering if anyone has used anything like it. Think it would look nicer than some guitar preamp setups I've seen as its just got a volume and tone pot instead if those EQ looking setups I've seen. Also the size of the pic