Synergy Modules | Fortin Killer Kali Preamp

The Synergy Fortin Killer Kali is a two-channel, all-tube preamp module developed in collaboration with Mike Fortin. Fortin has a long history of over 30 years in modifying and designing amplifiers for brands such as Marshall, Vox, Hi-Watt, Randall, and his own Fortin Amplification. He is recognised for his expertise in creating complex modern high-gain tones. This module is based on the Fortin Cali amplifier, incorporating its Violence and Saturation boost circuits, which were previously featured in the Cali and KK++ modifications. Designed with a British tonal character, the Killer Kali allows users of Synergy amplifier systems to access these specific and powerful sonic characteristics.

As a two-channel preamp, the Killer Kali is specifically designed for use within the Synergy Amp ecosystem. Each of its two channels operates independently, featuring its own set of tone controls and multiple options for shaping the sound.

The module offers two gain controls, labelled Gain 1 and Gain 2, which are arranged in a cascaded configuration. Gain 1 controls the initial gain stage, while Gain 2 affects the subsequent gain stage, providing a range of overdrive and distortion possibilities.

Each gain control is equipped with a three-way Bright switch. The topmost position delivers the brightest and most aggressive tone. These Bright switches interact with the Gain control in a way that their effect decreases as the Gain is increased, similar to the bright control found on a standard Plexi amplifier. The middle position provides a full-range response, unaffected by the Gain setting. The bottom position offers a brightness level comparable to the classic bright control on an 800 2203 amplifier.

The Violence switch offers two distinct gain structures. In the down position, the preamp utilises three gain stages. When the switch is moved to the up position, an additional tube gain stage is introduced, resulting in increased gain and saturation.

The Saturation (Sat) switch provides an additional tonal option. In the down position, the circuit operates without alteration. When switched to the up position, it engages an extra clipping circuit, which increases both compression and gain.

An EQ Shape switch provides three distinct voicings for the equaliser. The upward position yields a tone stack characteristic of "M" style amplifiers. The middle position offers a more "F" style voicing with a scooped midrange. The downward position provides a tonal characteristic that is described as being between the "M" and "F" styles, with a shift in the treble and midrange frequencies.