The Nebula Vintage Distortion is based on the Maxon DS-830 Distortion Master, first released in 2001 as part of Maxon’s Vintage Series. While the circuit was a brand new design, its aesthetics were inspired by the “big box” Maxon and Ibanez effects of the late 1970s such as the OD-880 and Phase Tone II.
The DS-830 circuit features both hard and soft clipping, with op-amp feedback diodes followed by diodes to ground, similar to the Nobels ODR-1. The EQ is made of two active gyrators, a bass control at 126 Hz and a treble control at 2.5kHz. Each of these frequencies can be boosted or cut as needed.
The updated version of the Nebula includes one new feature: a 3-way toggle switch that allows you to select soft clipping only, hard clipping only, or the stock mode with both sets of diodes engaged. This lends a bit of extra control over the clipping character not found in the original pedal. Other than this addition, it’s a direct adaptation of the DS-830.