AnaMod® 660 Compressor

Recreating the classic Fairchild 660, AnaMod-style

Classic Variable-Mu compression
Authentic vintage tone
Six original 660 time constants plus two new variations
All analog—no latency or digital conversions
Single space 500 series module

The Fairchild 660 limiter is one of the most famous and sought-after compressors ever made. The magical way it adds density and dimension to a track or a mix has been demonstrated on many of the best-sounding records made in the last 50 years.

Using The AnaMod Process™ to model the complex transformer and tube interactions of the vintage hardware and re-implementing it entirely with analog components, the AnaMod 660 delivers a faithful recreation of the classic unit's sound and compression action. Unlike digital plug-ins or DSP-based outboard gear, there's no latency and no A/D or D/A conversions to compromise the sound.

Praise

“Most audiophile-sounding compressor in the group. You have to try hard to make it sound bad. Adds a smooth, buttery layer to drums, bass, and guitars.” —Electronic Musician

AnaMod 660 Specifications

Input Impedance: 20 kΩ, balanced
Output Impedance: less than 50 Ω
Input Gain: -15 to +15 dB
Max. Output Level: +27 dBu, balanced
Frequency Response: +/- 1 dB from 40 Hz to 15 kHz
Noise Level: better than 73dB below +4 dBu, 0-30 kHz
Limiting Noises: same level as a vintage 660 with GE five star 6386 tubes and properly balanced
Total Harmonic Distortion: level- and compression-dependent matching the original unit

Time Constants

Positions 1-6 are the original time constants. Positions 2a and 2b are variations on position 2 with longer release times suitable for vocal performances.

Position	Attack Time	Release Time

1	0.2 ms	0.3 s
2	0.2 ms	0.8 s
2a	0.2 ms	1 s
2b	0.2 ms	2 s
3	0.4 ms	2 s
4	0.8 ms	5 s
5	0.4 ms	Auto, as in 660 #5
6	0.2 ms	Auto, as in 660 #6