Warm Audio C1 Mod Small Format Chorus / Vibrato Pedal

Warm Audio has compressed the most revered analog chorus and vibrato topology into a compact housing while introducing modern workflow upgrades. This small-format recreation from Warm Audio houses the same all-analog BBD circuit as the larger original, now equipped with a switchable preamp bypass and top-mounted jacks for tight pedalboard integration. The WA-C1 Mod maintains the single-input, dual-output stereo architecture in a 2.8” x 4.5” enclosure, delivering authentic vintage modulation with contemporary routing flexibility. A modern MN3007 Bucket Brigade Device chip drives the core circuit, carefully clocked to reproduce the midrange depth and harmonic complexity guitarists expect from the original hardware.

The pedal's preamp circuit matches the character of the celebrated original design, adding harmonic saturation and natural compression when engaged. A front-panel vintage/modern switch allows full preamp bypass to accommodate multi-stage rigs requiring precise gain management. The dual DC-DC voltage converter maintains proper internal operating voltages from standard 9V supplies, drawing 200mA at 800mW. Separate depth and rate controls replace the fixed-depth intensity knob found on vintage units, expanding the range of chorus voicings beyond period-correct settings. A rear-panel impedance selector switches between 50kΩ vintage spec and 1.1MΩ hi-Z mode for passive pickup clarity, functioning even in bypass. The signal path uses three Texas Instruments audio op-amps alongside 11 discrete transistors, three FETs, and 19 diodes.

The vibrato mode delivers rotary-like pitch modulation with adjustable speed and depth, monitored by a front-panel LED flashing at the selected rate. Stereo output routing creates wide spatial imaging when running dual amplifiers or recording direct. Input sensitivity switches between 80mV and 10mV to accommodate high-output sources or keyboard levels. Each unit ships from Austin, Texas after technician inspection and testing.

Features

• Analog chorus and vibrato with MN3007 BBD chip recreation
• Switchable preamp bypass via vintage/modern mode for gain-staging flexibility
• Independent chorus depth and rate controls beyond fixed vintage intensity
• Selectable 50kΩ or 1.1MΩ input impedance for passive instruments
• Dual DC-DC voltage converter for proper operation from 9V supply
• Stereo wet/dry output with single input and top-mounted jacks
• Three Texas Instruments op-amps with 11 transistors in signal path
• Compact 2.8” x 4.5” x 2.4” housing weighs 1lb