Ken Stone/1973 classic Serge/Serge ring modulator and gate

The following info on the 1973 variant of the Serge ring modulator / gate (VCA) module is presented for educational/historic purposes only and are not to scale.

Construction
Ring modulator PCB connections
 * A
 * B = VC X
 * C = Y
 * D = VC Y
 * E = X
 * F = Out

VCA PCB connections
 * A = CV lin in
 * B = CV log in
 * C D = DC sig in
 * E = AC sig in
 * F = Out
 * U = not used (0v)
 * W = 0v
 * X = +12v
 * Y = +6v
 * Z = -12v

CC-BY-NC
Readers are permitted to construct these circuits for their own personal use only. Serge Tcherepnin retains all rights to his work.