J. Rockett Airchild Six Sixty

The J. Rockett Airchild Six Sixty is a compressor pedal from J. Rockett Audio Designs that puts the character of a legendary studio piece in a stompbox. As the maker puts it, it "recreates the signature compression of the famous vintage Fairchild 660 limiter," the tube compressor that defined countless classic recordings¹. Where most compressor pedals take their circuits from guitar-era designs, the Airchild Six Sixty reaches for a studio rack unit: the original Fairchild 660, a single-channel tube limiter and compressor of which only around 1,000 units were made².

J. Rockett designed the pedal to work like a studio compressor, not just a limiter³. MusicRadar describes what it does to a guitar signal: "It smoothens out the transients, enhances harmonic richness and adds a hint of 'growl'"⁴. It was also designed as a way of enriching your tone with more harmonic content, just as the original tube-powered Fairchild 660 (and the stereo 670) compressors do⁴.

A compressor modeled on the Fairchild 660

The Fairchild 660 is a 1960s single-channel tube limiter and compressor, and Guitar Pedal X calls it perhaps the most legendary studio compressor of all, noting that only around 1,000 units were made². There are not many pedals inspired by it, as Delicious Audio's reviewer Paolo De Gregorio observed: "there aren't many pedals inspired by what's perhaps the most legendary studio compressor of all times: the Fairchild 660"⁵.

J. Rockett's take compresses that studio behavior into a compact pedal format³. The maker says the Six Sixty delivers rich harmonics and balanced transients, with a wide range of compression and an ultra-fast attack for sustain and dynamic control⁶. During development, the R&D team at J. Rockett used the guitar tones of Mark Knopfler and Lowell George as a reference, specifically Lowell George's slide playing⁴.

The controls: Output, Threshold, Tone and Blend

The pedal carries four controls, plus a footswitch to turn it on and off⁴. The housing is sturdy, with top-mounted jacks and oversized dials for Output and Tone⁴.

Output and Threshold work together as a pair. Delicious Audio's reviewer found that "Used together, they can produce a variety of effects, from subtle sustain to harmonic enhancement or more squished tones"⁵. Because Output has enough volume on tap to push an amp into saturation, it can double as a boost at the front of the chain⁵.

Why there is no ratio knob

The Airchild Six Sixty has no Ratio control. Instead, the J. Rockett team chose to stick to a fixed ratio that's optimal for electric guitars⁵. The Blend knob partly makes up for the missing ratio: Delicious Audio notes that Blend "compensates for the absence of the Ratio control by allowing to reintegrate some of the dry signal," reintroducing dynamics for a less compressed sound⁵. Gearnews describes the same idea from the player's side: Blend lets you mix dry and compressed signals to taste and add in as much of the original note attack as you want³.

An always-on compressor

J. Rockett's hope for the Airchild Six Sixty is that it becomes an always-on pedal⁴. That fits its studio heritage: rather than an effect you stomp for a solo, it is designed to sit in the chain permanently, smoothing transients and adding what Gearnews calls "a studio-grade sonic richness to your tone"³.

Build quality supports that use. Gearnews' reviewer wrote: "They look like they are built to last, and I imagine they will handle touring with no issues"³. The pedals are built in the USA, in a rugged case with large Fairchild-style control knobs and top-mounted jacks³.

Power, price and availability

The Airchild Six Sixty runs on 9V DC from a pedalboard power supply⁴. At launch in March 2024 it was available to pre-order at $229 in the US, £239 in the UK⁴. It is designed and built in California⁴.

For players comparing J. Rockett compressors, the company also makes the I.Q. Compressor and the Squeegee, alongside the related Airchild 660.

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