Dupertuis Electronique SA

Erica Synths Fusion VCF is our take on a four pole lowpass filter. Each side of the double triode drives signal between 2nd and 3rd stage of the filter, while germanium diodes are used to limit the output signal.
Features
4 pole lowpass resonant VCF with tube drive between stages
Three input signal mixer
Selectable 24db/12dB filter slope
Signal drop compensation, when resonance is increased
Germanium diode based output signal limiter
With this module you’ll get an ultimately deep sounding VCF with a unique character. Ingenious resonance volume compensation circuit and filter slope selection makes it ideal for live performances. Bonus feature – 3 input mixer with dedicated mixer output. Try patching the MIX OUT into one of the mixer inputs, increase the input level until the mixer goes into self-oscillation and use the filter to alter the drone, you have! The Fusion VCF is an instrument on it’s own!
All Fusion modules by default are configured to work with regular eurorack PSU.
Due to the fact that cold tube heaters have lower resistance, Fusion modules have significant power consumption peak at startup, when power consumption almost doubles for 1-2 seconds. This is not a problem with linear PSUs that have power inertia, but may cause switching PSU internal protection turn off the power supply. Please make sure your PSU has some headroom before installing multiple Fusion modules.
The Erica Synths Fusion series modules are designed combining vacuum tubes and semiconductors therefore they bring the warm, powerful sound and overdrive possibilities of vacuum tubes into your modular system. Erica Fusion series consists of a range of modules used in sound shaping circuit – VCO, Mixer, a real Ringmodulator using audio transformers and germanium diode ring, VCF, VCA and Analogue Delay/Flanger.
Would I build a setup around valve modules? I was expecting to say no, but having spent time with the Fusion setup I’m surprised to say I actually would. It’s distinctive, it’s versatile, but more importantly it’s fun. Music has always been about philosophies and aesthetic choices; Erica understand that and offer something fantastically different with the Fusion series. These are not sterile, surgical tools. Far from it. And they’re all the better for that. – Attack Magazine
Technical specifications:

Audio input level up to 20V ptp
Panel width 14HP
Module depth 35mm
Power supply bipolar -12V, eurorack standard
Eurorack PSU configuration 35mA@ 12V, 170mA@-12V
(NB – start-up power consumption for few seconds is -250mA)