Legendary 2500 Series 24 dB Low-Pass VCF and VCA Module for Eurorack

The first 2500 series synth modules came out in the 70s and tended to be extremely expensive. They were mainly all discrete transistor designs with some op-amps as at the time op-amps were high cost. The discrete circuitry gave the modules a very distinctive sound and were used by artists like The Who, Jean Michel Jarre, Vangelis, Kraftwerk and so many more, giving us some of the greatest records and film soundtracks we’ve ever heard. Modular synths were a landmark development in electronic music and today, it’s about to get better. 

Features

• Classic 1006 analog FiltAmp module from the '70s
• Authentic reproduction of the circuitry from the 2500 Series
• Consists of a 24 dB transistor ladder low-pass filter followed by a discrete VCA
• Filter cut-off frequency is controlled by external control voltages and by the Frequency control
• 3 external VCF control voltage inputs with variable attenuation respond at 1 V/Octave
• A resonance or peaked response at cut-off is adjusted with the Resonance control
• 2 audio signals can be mixed and their relative amplitude adjusted
• VCA accepts the output from the VCF and modifies the output signal level according to the sum of the Gain control and external control voltages
• 2 external VCA control signals can be attenuated by front panel controls
• VCA mode can be selected as either Exponential or Linear
• Eurorack specs: 16 HP, 22 mA 12 V, 20 mA -12 V