The following are presented for educational/historic purposes only and are not to scale. These designs are copyright Serge Tcherepnin.

Some info on the 1973 variant of the Dual Mixer:

• overlay and pcb pattern
• pcb pattern
• photo/overlay
• pot wiring

PCB connections:
A = mixer 2 input via pot
B = mixer 2 input via pot
C = mixer 2 input via pot
D = mixer 2 1x input
E = mixer 2 output
F = mixer 1 input via pot
G = mixer 1 input via pot
H = mixer 1 input via pot
I = mixer 1 1x input
J = mixer 1 output

U = Pot 0v connection.
x = +12v
W = 0v
z = -12v

Classic Serge