The Synth-Werk SW 735 BODE FREQUENCY SHIFTER is a precision-engineered, rack-mounted frequency shifter that offers continuously variable frequency displacement across a wide range of -5 kHz to +5 kHz, with a frequency response from 30 Hz to 16 kHz, unity gain, and exceptionally low noise and distortion levels, all powered by a built-in ±15V supply.

Design and Heritage

Synth-Werk developed the SW 735 as a rack version of the renowned Bode Frequency Shifter, directly referencing the circuitry of the original 1974 Moog 1630 model. While the form factor differs, the SW 735 retains complete electrical compatibility with the SW 1630, preserving the sonic character and performance that defined the original. It integrates seamlessly into modular or standalone studio environments, while delivering the same audio manipulation power through a dedicated internal power supply.

Signal Processing and Control

The SW 735 shifts the entire frequency content of an incoming signal by a user-defined amount, altering the harmonic relationships within the spectrum. Unlike pitch shifters, which transpose the signal, frequency shifters reconfigure the intervallic structure of the input, resulting in distinctive and often complex audio textures. The shift amount remains continuously adjustable from -5,000 Hz through zero to +5,000 Hz, and the user can control this shift manually or via voltage control sources. The control response can be configured for either linear or exponential scaling, offering precise modulation capabilities for both musical and technical applications.

Output Configuration and Mixing

The unit simultaneously delivers three outputs: an up-shifted signal, a down-shifted signal, and a continuously variable blend between the two. This allows users to shape the spectral character of the processed signal in real time or under voltage control, opening up a broad range of sound design and feedback suppression techniques.

Noise Management and Tuning Tools

To reduce the impact of carrier bleedthrough, the SW 735 includes a variable-threshold squelch circuit that suppresses artefacts caused by input signal noise. Fine-tuning of the zero-shift point is available, allowing for accurate alignment of modulation and signal balance. With less than 1% total distortion and under 0.1% hum and noise, the unit maintains clean audio integrity even in complex processing chains.

Electrical Specifications

The Synth-Werk SW 735 operates with a nominal input impedance of 50k ohms and a nominal input level of +2 dBm. It maintains a flat unity gain between input and output, making it highly reliable for integration in professional audio setups. It requires a ±15V DC power source and draws +100 mA and -100 mA respectively.

Musical and Technical Applications

Used creatively, the SW 735 introduces radical transformations in timbre and overtone structure. It supports a broad spectrum of sonic applications—from subtle tone colour shifts and dynamic modulation effects to extreme feedback loops and metallic, inharmonic textures. Ideal for P.A. systems, analogue synthesis, sound design, and experimental music, it brings the legendary character of the Bode design into the modern modular landscape.