Up for sale today is A VERY SPECIAL Undertone Audio Unfairchild Model 670M II formerly owned and operated by ERIC VALENTINE at Barefoot Studios. I purchased this directly from Eric and it sounds outstanding. I just had a checkup on it from our tech in Nashville.

This isn’t just a 670M II, it is one of a few special Pilot Versions made and in use at the former Barefoot Studios in California by Producer and Undertone Audio creator Eric Valentine. There were only a handful of these Pilot 670's every made. It still has the original labels showing PILOT #2.

*We also have an Undertone Audio UNFa-1 Accessory available for separately if you're interested.

Pick up is preferred but I will ship upon request. Depending on your location I may be able to deliver for a cost.
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Undertone Audio UnFairchild 670M II

Classic

The Fairchild circuit could be one of the most coveted and time tested compressors of all time. It has proven its extraordinary universal musicality for over 5 decades on countless genres of music. The beauty of its design is in its simplicity. The audio path, primarily consisting of only 2 transformers and 4 paralleled vari-mu tubes, can provide a gentle smoothing of levels or an explosive, energizing compression that will make any recording leap out of the speakers. The UTA UnFairchild is a painstaking recreation of the classic sound of this circuit.

Flexible

There are a few limitations of the original Fairchild that we set out to address. First, we have made careful adjustments to the circuitry that greatly improve the lifespan and reliability of the tubes. Additionally, we've added a whole host of exciting new features that have never before been available on a Fairchild. The UnFairchild sports 6 original preset Time Constants and 4 variable Time Constants (attack and release), MS function, side chain processing, a true bypass, fine adjustment of left/right balance, user adjustable "DC Threshold", and "Feed-Back" vs. "Feed-Forward" functionality. With the UnFairchild, we've made this extraordinary circuit flexible enough to handle pretty much every compression task on any style of music.