The Fairchild 670 compressor, with its classic design and timeless charm, has played a pivotal role in shaping the sound of modern music. Since its introduction in the 1950s, it has become a coveted piece of audio equipment, celebrated for its smooth, musical compression and rich harmonic saturation.
Independent control of both vertical and lateral amplitudes on stereo disks
Extremely fast attack time
Variable release time
Limiter or compressor
Technical Specifications
NPUT AND OUTPUT IMPEDANCE: 600ΩRANGE OF INPUT LEVEL: 0 dBm to +16 dBmOUTPUT LEVEL: +4 or +8 dBVU (+27 Bm clipping point)GAIN: +7dBFREQUENCY RESPONSE: 40Hz to 15kHz +/- 1dBNOISE LEVEL: 70dB below +4dBmLIMITING NOISES: Below audibilityINTERMODULATION DISTORTION:Less than 1% at any level up to +18 dBm output (no limiting)Less than 1% at dBm limiting +12dBm outputTIME CONSTANT ATTACK AND RELEASE TIMES:(Note: Positions 5 and 6 release times are automatic function of program material)Position 1 - .2ms/ 3 secPosition 2 - .2 ms / .8 secPosition 3 - .4 ms / 2 secPosition 4 - .4 ms/ 5 secmy
Position 5 - .4 ms / .2 sec individual peaks, 10 sec multiple peaksPosition 6 - .2 ms / .3 sec individual peaks, 10 sec multiple peaks, 25 sec consistently high program levelsCOMPRESSION RATIO: A function of the amount of limiting as well as setting of the two threshold controls which can be set to operate at ratios from 1:2 to 1:30POWER REQUIREMENTS: 120 or 240 volts, 60 cycles AC, 3 amps.INSTALLED TUBES: 8x 6386, 2x 12AX7, 4x 6973, 2x 12BH7, 1x E80F or (1xEF806), 1x 5651, 1x EL34, 1x GZ34
