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The AT-101 is a faithful recreation of the original Fairchild 670 stereo limiter. The AT-101 is built using traditional point-to-point wiring methods and standard turret component mounts. The audio path and power supply are completely free from any printed circuit boards.


The AT-101 like the original Fairchild 670 has been assembled completely by hand and uses high quality modern components. The tube complement is exactly the same using a new generation 6386 remote cut-off triode developed to replace the original 50 year old tube types many of which were used in the Fairchild 670.

What It Does


The AT-101 is a beautiful and natural sounding Stereo limiter that brings out detail in your tracks. The unique features of it's legendary design allow all types of instruments and sound to sit "up front" in the mix sounding fatter and bigger bringing the material forward to add depth, dimension and clarity to your music.


The AT-101 glues the image together for all types of program and gives your mixes a "finished" quality making this natural sounding compressor an indispensable tool.


  • Original 1db per step ‘T’ Attenuators (21 step total)

  • Original complement of tubes

  • Original transformer balanced audio path

  • Original transformer balanced control path

  • Original transformer bias supply

  • Newly developed 6386 Triode tubes– new feature

  • Non-Inductive Wire-Wound resistors throughout Audio Path

  • Original Non-Inductive Pots throughout

  • Original tube Anode supply

  • Original CVT heater supply - optional

  • Silver Mica capacitors – new feature

  • All Teflon ‘Point to Point’ wiring throughout – new feature

  • Ceramic Tube sockets throughout – new feature

  • Stereo Link switch fitted – new feature

  • VCA Standby switching fitted – new feature

  • Variable HPF fitted to side chainoptional

  • Original Lat/Vert switching fitted

  • Left - Right bypass switching fitted – new feature

  • Illuminated Simpson Electric metering - new feature 

  • Top and bottom panel torque hinges - new feature

  • Original front panel

  • New Chassis Design – new feature

  • Large Knobs

  • XLR Chassis mounting connectors – new feature

  • Specially made Sowter audio transformers throughout - new feature

  • Switched IEC mains socket - new feature

  • US or EUK power - new feature

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