The underside of the six switches, still in their original metal frame as built by Brian. The top row of switches as pictured here (the bottom row when the frame is within the Red Special, of course) reverse the phase of each pickup, as the wiring clearly shows.
The number of tones that this deceptively simple configuration gives is incredible and it’s interesting that no other commercially available guitar possesses anything like it, the myriad Red Special-style guitars notwithstanding.
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Don’t miss Simon’s six-part blog that goes behind the scenes of the book in much more detail