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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
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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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
4.0 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Good for dogs who like to rip stuff up
Style: Alligator
Apparently it’s really good because my dogs already destroyed it. So I’ll take that as a success. It’s a good size for big dogs. Not the strongest, but I didn’t get it for that reason, I got it to be destroyed. Both my dogs were able to play tug of war with it.
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Reviewed in the United States on February 4, 2026
★★★★★ 4
A great enrichment toy to keep your dog occupied
Style: Fox
Do you have a small furry gremlin disguised as a dog in your life that needs entertaining while you work? Get yourself one of these!
PROS
- it keeps a smart dog occupied for anywhere between 10-20 minutes
- if keeps a less than smart dog occupied a lot longer
- you can fit quite a lot of treats of different sizes in there
- you can throw it in the washing machine when it gets too dirty
- also doubles as a tug of war toy
CONS
- it gets dirty fast
- if you have a heavy chewer they'll rip it up and render it useless pretty quickly
- it squeaks (good for dog not for human)
This is one of my girls favourite toys, even now that she's a bit older and doesn't need constant stimulation she still enjoys running around with it and digging the treats out.
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Reviewed in the United States on September 13, 2025
★★★★★ 5
Dog loved it.
Style: Frog
Dog loved it, squeaker lasted about 5 minutes, which is about normal for any toy I’ve given her.
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Reviewed in the United States on May 21, 2026
★★★★★ 3
Frustrating and Not Durable
Style: Turtle
My Foxhound /Beagle mix had this toy torn in several places within minutes. He loves his toys, but this one seemed to frustrate him and me. The small slits are too tight for anything but kibble. The large pouch is too deep for treats, and would send kibble flying as soon as he shook it. Anything larger would get stuck! The pouch tore at the seams as soon as my dog tried to pull out a Milkbone. Only small treats would fit in the slits, and he’d lose interest with them. The squeaker was useless due to the large size and hardness of the head. The weight and size of the head and the length of the toy might be a problem for smaller dogs. This toy was returned.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
GSP Approved!
Style: Frog
Our GSP loves this! It's only keeps her busy for a few minutes, but then she carries around for an hour. The pockets are a great size for training treats and the Velcro has held up well despite repeated daily use!
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Reviewed in the United States on May 9, 2026