$ 1,999.00

Heritage Audio has undertaken an unprecedented engineering effort to encapsulate all the charm of the HERCHILD 670 into a more affordable unit so that the flavor of its predecessor is now available for studios with all types of budgets.

Welcome to the next generation. The first ever stereo Vari-MU compressor in a 2 slot 500 series module, based on the renowned Fairchild, could not have existed without the years of experience in building the most complex 500 series modules on the market together with the years of studying and developing the HERCHILD models 660 and 670.


  • The Fairchild for the rest of us.

  • A true recreation of the classic Fairchild sound in a convenient and affordable 2-slot-unit 500 series module.

  • Real Vari-MU compression powered by 2 NOS military grade 6BA6 tubes per channel and 3 custom made transformers at its core.

  • 5 Attack and Release times have been made even more flexible than in the original unit.

  • Immediate access to the continuously variable slope.

  • Clean, intelligent design to guarantee many years of use.


  • Input Impedance: 15 kΩ. 
  • Output Impedance: 50 Ω. 
  • Output Level: +29 dBu. 
  • Frequency Response: 20 Hz to 20 kHz ± 0.5 dB. 
  • Self Noise: Less than -78 dBu. 
  • Harmonic Distortion: Less than 0.5 % at any level up to +24 dBu output (no compression).
  • Dimensions (W x H x L): 180 mm x 133 mm x 75 mm.
  • Weight: 1.120 Kg.
  • Consumption: Slightly over 200mA per rail per slot (+16V/-16V).