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Fairchild 670


Specifications

 (Each channel, unless otherwise specified)

 

INPUT IMPEDANCE: 600 ohms

OUTPUT IMPEDANCE: 600 ohms

RANGE OF INPUT LEVEL: 0 dbm to +16 dbm. (-4 dbm to +16 dbm) (model 660) OUTPUT LEVEL: +4 or +8 dbm (+27 dbm clipping point)

GAIN: 7db (16db Model 660)

FREQUENCY RESPONSE: 20 cycles to 15 kc +/- 1db.

SEPARATION: A-B position: 60 db vertical-lateral position: 40 db (does not apply to 660)

NOISE LEVEL: 70db below +4 dbm

LIMITING NOISES: Below audibility

INTERMODULATION OR HARMONIC DISTORTION: Less than 1% at any level up to + 18 dbm output (no limiting) Less than 1% at db limiting +12dbm output

ATTACK TIME: .2 milliseconds on positions 1, 2 and 6 .4 milliseconds on positions 3,4 and 5 (adjustable)

RELEASE TIME: Position 1: .3 sec Position 2: .8 seconds Position 3: 2 seconds Position 4: 5 seconds Position 5: Automatic function of program material: 2 seconds for individual peaks. 10 seconds for multiple peaks. 25 seconds for consistently high program level.

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: 115 volts, 50-60 cycles AC, 3 amps.

STABILITY: Unit maintains stability of gain, gain reduction and balance over the range of line voltage fluctuations from 100 to 127 volts.

 

 Description

Many people have seen versions of this limiter in a digital plug in format, but nothing can compare to the original analog version. The Fairchild 670’s basic design uses a single, push-pull stage of amplification. The result being that there are never any audible thumps in the compression. The 670 incorporates two independent limiters that will act on left and right channels or which will act on the lateral and vertical (sum and difference) components of the two stereo channels. The lateral and vertical setting is accomplished by first bringing the two stereo channels through a matrix network that divides them into their lateral and vertical components, limiting them separately and then combining them through a second matrix network into left and right channels again for output. Our Fairchild 670 is one of our fought over pieces of gear. The warm, rich sound that flows from the 670 is due to the tubes and the transformers that are unique to this unit. This limiter sounds great on anything you can think of, from individual instruments to a stereo bus limiter.