...but I need to ask a question of the resident electronics whizzes: The pickups on this MC924 (those old "brownie" pickups with the big exposed polepieces) have three conductors... red, white and twisted shield (ground?). The Bartolini schematic for the preamp (HR-5.4AP/918) only shows where to connect "hot" and ground wires. I know I shouldn't assume, but, assuming the twisted shield is ground, which should I consider the "hot"... red or white? Also, what do I do with that 3rd remaining lead? Your expertise is much appreciated!