Fairchild 670

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.

Fairchild 670

The FAIRCHILD 670 is a highly coveted vacuum tube compressor/limiter, now faithfully recreated to offer modern producers and audio engineers the classic sound of the original hardware. Unlike other 670 replicas, this FAIRCHILD 670 stays true to the original design. It features the same tubes and custom-wound transformers, meticulously crafted to the original specifications. With its point-to-point soldering and turret-style construction, this is the only authentic recreation of the original 670, built and designed by Rein Narma at the request of Les Paul. We are thrilled to present this detailed and exacting recreation of the legendary FAIRCHILD 670—the legend reborn.

Features

Exact historical recreation of vacuum tube unit
Independent control of both vertical and lateral amplitudes on stereo disks
Extremely fast attack time
Variable release time
Limiter or compressor

Technical Specifications

INPUT AND OUTPUT IMPEDANCE: 600Ω

RANGE OF INPUT LEVEL: 0 dBm to +16 dBm

OUTPUT LEVEL: +4 or +8 dBVU (+27 Bm clipping point)

GAIN: +7dB

FREQUENCY RESPONSE: 40Hz to 15kHz +/- 1dB

NOISE LEVEL: 70dB below +4dBm

LIMITING NOISES: Below audibility

INTERMODULATION DISTORTION:

Less than 1% at any level up to +18 dBm output (no limiting)

Less than 1% at dBm limiting +12dBm output

TIME CONSTANT ATTACK AND RELEASE TIMES:

(Note: Positions 5 and 6 release times are automatic function of program material)

Position 1 -.2ms/ 3 sec

Position 2 -.2 ms / .8 sec

Position 3 -.4 ms / 2 sec

Position 4 -.4 ms/ 5 sec my

Position 5 -.4 ms / .2 sec individual peaks, 10 sec multiple peaks

Position 6 -.2 ms / .3 sec individual peaks, 10 sec multiple peaks, 25 sec consistently high program levels

COMPRESSION 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 1:30

POWER 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