Description

Model 670

The FAIRCHILD 670 is a highly sought-after vacuum tube compressor limiter that has been faithfully recreated to provide modern producers and audio engineers with the classic sound of the original hardware. Unlike other 670 recreations, the new FAIRCHILD 670 is true to the original. Utilizing the same tubes and custom wound transformers built to original spec. The architecture, point to point soldering and turret style construction make this piece of gear the only authentic recreation of the original 670 built and designed by Rein Narma at the behest of recording legend Les Paul in 1959. With its dual-channel design and unique compression characteristics, the FAIRCHILD 670 is capable of adding warmth, depth, and character to any audio signal. The vacuum tube technology used in the FAIRCHILD 670 adds a natural, organic quality to the compressed signal, providing a rich and dynamic sound that is highly prized by audio professionals. We are proud to announce this faithful and meticulous recreation of the original FAIRCHILD 670, The legend reborn.

Key Features:

Dual mono/stereo operation
Six selectable time constants
Threshold, compression, and makeup gain controls
VU metering
Hand-wired point-to-point construction
Custom-designed transformers
Tube-driven amplification

Applications:

Vocals
Drums
Bass
Guitars
Strings
Piano
Brass
Orchestral instruments
Mix bus/mastering

TECHNICAL SPECIFICATIONS:

INPUT AND OUTPUT IMPEDANCE: 600 Ω
RANGE OF INPUT LEVEL: 0 dBm to +16 dBm
OUTPUT LEVEL: +4 or +8 dBVU (+27 dBm clipping point)
GAIN: +7dB
FREQUENCY RESPONSE: 40 cycles to 15 kc +/- 1dB
NOISE LEVEL: 70 dB below +4 dBm
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) .2 ms / .3 sec
Position 2) .2 ms / .8 sec
Position 3) .4 ms / 2 sec
Position 4) .4 ms / 5 sec
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.
CONTROLS:
a) 2 Input Gain controls: Step attenuator: 1 dB per step.
b) 2 Threshold Controls: continuously variable.
c) 2 Time Constant Switches: 6 positions so as to provide fixed and variable time constants for any type of program material.
d) 2 Metering Switches: 3 positions so as to measure plate current of each control tube, or as a limiting indicator.
e) Mode Switch: A-B positions: 2 independent limiters. Vertical-Lateral position: matrixing input and output, left and right in and out, limiting action vertical-lateral.
f) On-off switch