Fairchild 670

Introducing the FAIRCHILD 670 reborn, a faithful replica of the original highly regarded as one of the most effective and sonically pleasing compressors ever made. Highly coveted by studios worldwide for its significant contribution to numerous hit records, the FAIRCHILD 670 is well-known for its broad capability to generate a variety of compression effects – from the soft, almost invisible, to the intense and highly pronounced. It boasts of its distinctive fusion of valve-driven amplification and gain reduction, which makes it so versatile.

Key Features:

• Works in mono/stereo modes
• Select from six time constants
• Equipped with threshold, compression, and makeup gain controls
• Features VU Metering
• Custom-designed transformers
• Hand-Wired, point-to-point assembly
• Amplification driven by tubes

Applications: Employ the FAIRCHILD 670 in a variety of applications, including use with:

• 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
• 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: Advantageously stepped, allowing 1 dB per step adjustments.
b) 2 Threshold Controls: Fine-tuned variably.
c) 2 Time Constant Switches: 6 position-switches to provide fixed and adaptable time constants for any type of audio material.
d) 2 Metering Switches: Can operate in three modes to measure the control tube’s plate current or act as limiting indicator.
e) Mode switch: It has A-B positions for two independent limiters and a Vertical-Lateral position for matrixing in/out on both sides, limiting action vertically/laterally.
f) Power Switch

Tube Configuration: 8x 6386, 2x 12AX7, 4x 6973, 2x 12BH7, 1x E80F or (1x EF806), 1x 5651, 1x EL34, 1x GZ34