Division 6 CEM3340 VCO - Eurorack Module on ModularGrid
Behringer CRAVE Analog Synthesizer Analog Semi-Modular Synthesizer with 3340 VCO, Classic Ladder Filter, 32-Step Sequencer and 16-Voice Poly Chain, Compatible with PC and Mac : Amazon.co.uk: Musical Instruments & DJ
electro-music.com :: View topic - Very simple sawtooth VCO (V/Hz)