There is a reason this unit is synonymous with the "Lead Vocal" sound of the 1960s and 70s. When you run a vocal through a Fairchild, it sits forward in the mix. It sounds present and expensive.
The Fairchild 670 is a highly regarded, vintage audio compressor made by Fairchild Recording Equipment Corporation in the 1950s and 1960s. It's considered one of the most iconic and sought-after compressors in the history of recording. fairchild 670
: The 670 is a massive 6U rackmount unit featuring 20 vacuum tubes and 11 heavy-duty transformers. There is a reason this unit is synonymous
Most users ignore the DC bias trimpot (external on some units). Adjusting it shifts the tube operating point: The Fairchild 670 is a highly regarded, vintage
Unlike modern compressors that use VCAs (Voltage Controlled Amplifiers) or FETs (Field Effect Transistors), the Fairchild 670 is a compressor. It utilizes a unique circuit topology where the vacuum tubes themselves handle the gain reduction by varying their "mu" (gain) in response to the input signal.
If you ask an engineer to describe the sound of a Fairchild, you will often hear the word "sweetening."