1 markachou 9 months ago Hello everybody, I'm new to this super forum. I need help because when I was young (and stupid) I modified the wiring of my country gentlemen (made in 1976) in order to split the two side of the filtertron and have the possibility of connecting them parallel or serial with a switch. Now that I'm old (and reasonable) I'd like to re-wire my gretsch like "original" The problem is that I dont remember how these filtertron were wired. So I join a pic of one of the filtertron : You see a black and a red wire coming out of each coil. So I've seen that the two coils must be wired in parallel (I suppose ?!) But how must I connect them : red with red and black with black or reds with blacks and which wire must go to the ground. Thanks a lot for your infos because before doing anything wrong, I wanna be sure !