Schippmann CS-8 ol VDL-6
Discrete diode stereo low-pass filter
The current CS-8 ol series determines generally products, which are realized in
a so-called "open loop" design. These are electronic circuits working without
high amplification amplifiers and then stabilizing and linearizing feedback
loops. In earlier times (1970s years) these techniques were widely used. Typical
sound properties are featured by warmth and creaminess. In this manual, the first two products will be described, namely the voltage-controlled filters (VCF) HDH6 and VDL6. VDL6 stands for Vertical Diode Lowpass with also a slope of 36 db/octave. Each of these filters is constructed as a true dual filter containing two identical and independent filters A and B. Each filter, A and B, provides 4 simultaneous outputs with different slopes, which are clearly different in sound. By mixing and/or subtracting and/or sharing of the overall 8 outputs one obtain mighty musical, creative possibilities. The module is designed with a width of 19 PU (part u nits, 1 PU=5.08mm) for installation.