Glue your mixes and busses together with the distinctive character of tube-driven variable-mu compression, using theGRANDCHILD 670fromHeritage Audio, a two-space 500-series stereo compressor outfitted with four 6BA6 (5749) NOS tubes, three exclusively designed transformers (one per channel and and one for the sidechain), and the select components and circuitry necessary to capture that sought-after warm, analog sound.

The Fairchild for the Rest of Us

• Based on the legendary Fairchild 670 compressor and Heritage Audio’s HERCHILD 670 model, theGRANDCHILD 670 puts the proven performance of the HERCHILD Model 670 in a cost-effective, two-space 500 series module.
• The module features an attractive front panel complete with a large, informative VU meter that not only provides Gain Reduction metering, but also shows the units 3-position Active/Bypass/Off switch from a distance.
• In common with its big brother, there is an Input Gain control with an adjustable range of 20 dB, the AC Threshold, and 5selectable Attack/Release times. In addition, the DC Threshold control provides a unique compression curve adjustment combining control of the ratio and knee, soft stepped from hard limiting to a very smooth and transparent, light compression.
• Use the 3-position high-pass Sidechain filter to reduce the lower frequencys influence on the detection circuit, a must-have feature for contemporary productions.
• The stereo GRANDCHILD 670 uses the sum of the two channels to determine the overall amount of gain reduction for both channels, ensuring a stable stereo image.

That Elusive Variable-Mu Sound

• Vacuum tubes in the gain-reduction circuit is at the heart of the specific tonality provided by variable-mu compression.
• Four 6BA6 (5749) tubes and three transformers ensure classic, top-tier analog performance for your mixing and mastering sessions.
• It’s not easy to achieve that classic warm, hugging, intimate sound that just seems to effortlessly glue together a mix in a musical way, but the GRANDCHILD 670 delivers it, effectively providing that that lush, classy, and elegant tone.

Specifications