by Robin Vincent | Approximate reading time: 1 Minute
G-Storm 4027 VCO

 ·  Source: G-Storm

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G-Storm continues their classic synth adaptations into Eurorack with the 4027 VCO module based on the 4027 oscillators chips found in the ARP 2600 and Odyssey. 

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4027 VCO

They’ve already tackled the ARP 2600 filter and recently we saw the XaVCF take on the Oberheim filter and the awesome take on the SH-101 oscillator and filter in the 101-VCO and 101-VCF and they’re just the ones we’ve noticed. The 4027 VCO is an all-analogue sawtooth core oscillator with Sine, Triangle and Pulse waveforms with Pulse-Width Modulation. They’ve worked hard to make it as close to the original as possible using a matching transistor pair, an Interfet premium dual FET, temperature compensated resistors, low ESR styrene oscillation capacitor, 5-NPN monolithic substrate transistor array, precision Tune and Tracking trimmers, and the 70s spec op-amps which are still being offered today. All completely vital for those who know about these things.

Features include:

  • Waveforms: SINE (-4v to 4v), TRIANGLE (-4v to 4v), SAWTOOTH (0 to 6v), PULSE (0-6v) w/ PWM.
  • Three 30mm throw Illuminated Bourns slide pots – Frequency, Fine Tuning, and Pulse Width
  • Three 20mm throw Alpha CV slide pots
  • CV1 input: Wide Frequency Modulation (FM)
  • CV2 input: Reduced Frequency Modulation (Vibrato, FM)
  • Keyboard (KBD) V/Oct input.
  • Multi-turn Trimmers: Tune, Tracking
  • Single-turn Trimmers: TRI Symmetry + DC Offset, SINE Purity + Gain
  • CV Frequency Range: C1 –C8 when Initial Freq. is fully decreased
  • No-Input Freq. Range: 10-550Hz
  • Slim design makes it skiff/boat-friendly.

The layout and front design are very reminiscent of the ARP and I’m really enjoying those illuminated Bourns slide pots.

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The 4027 VCO is available now for €245.

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G-Storm 4027 VCO

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