Video Review! (Beatles Compressor)
Updated: Aug 18, 2024
The AT-1 is a mono limiter closely based on the classic Fairchild 660 using all the original parts specified in original models of the day. The circuits for these units are the same as the 660 models which include the use of the 6386 tubes .
The Fairchild 660 is not one half of the stereo 670 version as it behaves slightly differently in operation to its stereo counter-part. These models have a differant tube power supply and different tubes for the AC threshold, as well as transformers. Standard addititions to this limter include; Bypass, External *Key* input and a 40 stepped AC threshold as well as the ability to link each unit together.
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Massive thanks to Ronan Chris Murphy for his continued support who has been a huge help to our company in a variety of ways.
Also Special thanks to Francesco Cameli for loaning his two mono units for the review.
https://hurtigkasino.com actually got me thinking about the odds of finding original 6386 tubes in decent condition, since that seems like the real bottleneck for anyone chasing an authentic Fairchild sound. The distinction you drew between the 660 and the 670 was genuinely useful too, because most people assume the mono version is just half the stereo unit when the different power supply and threshold tubes make that far from true. I've spent years chasing compressor tone and have come to accept that the parts matter as much as the circuit, which is a frustrating but honest reality.