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Undertone Audio UnFairchild 670M II – Legendary Tube Vari-Mu Compressor

The Undertone Audio UnFairchild 670M II is a masterfully engineered dual-channel tube compressor that faithfully captures the iconic sound of the original Fairchild design—while expanding its capabilities for modern studios. Renowned for its rich harmonic character and musical compression, this unit delivers everything from smooth, transparent leveling to bold, explosive dynamics that make tracks stand out in any mix.

At its core, the UnFairchild 670M II utilizes a classic vari-mu tube compression circuit, featuring four paralleled tubes and a minimalist signal path with only two transformers. This elegant design produces the unmistakable warmth, depth, and glue that have defined countless legendary recordings across decades.

Built for versatility, the compressor includes six original time constants along with four variable settings, allowing precise control over attack and release behavior. Whether you’re gently controlling peaks on vocals or aggressively shaping drums and buses, the UnFairchild adapts effortlessly to any application.

Modern enhancements elevate its performance beyond vintage limitations. Features like Mid/Side (M/S) processing, sidechain control, true bypass, and an adjustable DC threshold provide engineers with expanded tonal shaping and workflow flexibility. At the same time, improved circuitry ensures greater reliability and extended tube life for long-term studio use.

Key Features:

• Authentic Fairchild-style vari-mu tube compression
• Dual-channel design for stereo or dual-mono operation
• Six classic + four variable time constants for flexible response
• Mid/Side processing for advanced stereo control
• Sidechain processing for creative dynamics shaping
• True bypass for transparent signal comparison
• Adjustable DC threshold for precise compression behavior
• Premium tube complement (6386-LGP, ECC83, ECC99)

Housed in a robust 19” rack-mount chassis (8U), the UnFairchild 670M II is built for professional studio environments, offering balanced XLR connectivity and high-end analog performance.

For engineers seeking the legendary Fairchild tone with modern control and reliability, the UnFairchild 670M II stands as a powerful, musical centerpiece capable of elevating any recording to world-class quality.