description Fairchild 670 Overview
The Fairchild 670 is a highly sought-after tube-based stereo variable-mu compressor introduced in 1959 and originally designed by Rein Narma. It utilizes 14 vacuum tubes per channel to achieve its distinct gain reduction characteristics. Due to its complex design, heavy weight, and limited production, the unit is rare today but remains a staple in high-end recording studios for smoothing out vocals and mix buses.
help Fairchild 670 FAQ
Why is the Fairchild 670 so highly prized by audio engineers?
Introduced in 1959, the Fairchild 670 is universally revered for its incredibly musical, warm, and "lush" compression thanks to its all-tube signal path. Unlike modern solid-state compressors, it adds a rich harmonic distortion that glues tracks together beautifully.
How many vacuum tubes does a Fairchild 670 actually use?
The unit is notoriously heavy and complex because it utilizes a staggering 14 tubes per channel to run its unique push-pull gain reduction circuit. This massive tube count generates immense heat and requires extremely high voltage to operate.
Who was the chief engineer that designed the Fairchild 670?
The compressor was designed by the brilliant Estonian-American audio engineer Rein Narma. He invented the unique variable-mu design that allowed the unit to achieve incredibly smooth gain reduction without audible distortion artifacts.
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