Erica Synths K-Phaser Brings Classic ‘Krautrock’ Sound To Eurorack

Erica Synths has introduced the K-Phaser, their take on a classic hardware effect design, the so-called ‘Krautrock Phaser’.

In the 70s, several German ‘kosmische’ bands, including Tangerine Dream and Klaus Schulze, used a rare analog effect, the Gerd Schulte Audio Electronik Compact Phasing A, to create spacey phasing effects. This effect has been cloned in recent years, notably by the late synth DIY guru Jürgen Haible.

The Erica Synths Black K-Phaser retains the original concept of 8 all-pass filters with photoresistors, but but with redesigned filters, modulation circuit and additinal features.

A dip switch allows for selecting the number of filter stages involved in the resonance path, while the resonance attenuverter brings in feedback artifacts. The SPREAD mode detunes the all-pass filters for even more distinct behavior. A built-in voltage controlled LFO with selectable waveforms expands the modulation possibilities of the phaser and can be used as an independent modulation source for your modular system, as well.


  • 8 all-pass filters with photo-resistor control
  • Classic and Spread (filter detune) mode
  • Resonance attenuverter
  • Selectable resonance path
  • Built in VC LFO with a dedicated output
  • Wet output

Pricing and Availability

The K-Phaser is available now to pre-0rder for €190.00.