Heritage Audio GRANDCHILD 670 Tube Vari-Mu Stereo Compressor for 500 Series
SKU: 45722518483

Heritage Audio GRANDCHILD 670 Tube Vari-Mu Stereo Compressor for 500 Series

Sale price$1664.55 Regular price$1849.50
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Description

Heritage Audio GRANDCHILD 670 Tube Vari-Mu Stereo Compressor for 500 SeriesGlue your mixes and busses together with the distinctive character of tube driven variable mu compression, using the GRANDCHILD 670 from Heritage 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

Glue your mixes and busses together with the distinctive character of tube-driven variable-mu compression, using the GRANDCHILD 670 from Heritage 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, the GRANDCHILD 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 unit’s 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 5 selectable 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 frequency´s 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

Input Impedance
15 Kilohms
Output Impedance
50 Ohms
Output Level
+29 dBu
Frequency Response
20 Hz to 20 kHz ±0.5 dB
Self Noise
< -78 dBu
Harmonic Distortion
< 0.5% at Any Level up to +24 dBu Output (No Compression)
Consumption
Slightly over 200 mA per Rail per Slot (+16 V / -16 V)
Dimensions
(W x H x L): 7.1 x 5.2 x 3" / 180 x 133 x 75 mm
Weight
2.6 lb / 1.12 kg
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 45722518483

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JOY11
Los Angeles, US
★★★★★ 4
It's a functional organizational tray
I bought this valet tray for my nephew to be able to organize his go-to items, such as his cell phone, wallet, watch, bracelet, etc. I expected the tray to look more upgraded. The compartments are shallow, but they do the job. It is made of a cardboard-type material ( corkboard would have been nicer), and the black platform is a metal construction, which gives it a more stable and solid structure. Overall, for the price and its functionality, I guess it was worth the purchase.
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Reviewed in the United States on January 15, 2026
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BroRon
Charlottesville, US
★★★★★ 5
Really wonderful
Beautiful and realy convenient to use.
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Reviewed in the United States on February 11, 2026
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Krispy
Belleville, US
★★★★★ 5
Good bang for buck
Nice and budget friendly valet tray, would buy again!
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Reviewed in the United States on January 19, 2026
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Perry E.
Belleville, US
★★★★★ 5
Great organizer! No more lost stuff!
We bought this for a friend who was always misplacing his keys, badge, wallet, etc... This has helped him get his every day carry stuff organized and he has not "lost" anything since.
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Reviewed in the United States on May 13, 2026
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JoelG
Pawtucket, US
★★★★★ 4
Good value, but buyers should be aware that the metal base extends only on edges
I think this tray is a good value compared to other vendor's products that are $100+. I plan to keep it because it is a good value for me. HOWEVER, realize that the metal base does not extend across the full base of the cork liner. Metal pieces are only on the edge of long side of the liner. Also, the metal is lightweight.
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Reviewed in the United States on March 10, 2026

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