The Drip 175 is an exact recreation of the Urei/Universal Audio 175b vari-MU limiter.  Drip Electronics offers a PCB and support for this project. Since the 175 shares the same vari-MU compression style as the Fairchild 660/670, Drip has also developed an add-on which allows the 175 to emulate the Fairchild time constants.

Notable Features:

• Tubes used:
  • 6bc8
  • 12bh7
  • 12ax7
  • 6aL5
  • ob2 regulator glow tube
  • gz34 rectifier tube
• PCB accepts metal film or carbon comp resistors
• Retains original power supply
• Directly accepts PCB-mount transformers from:
  • Sowter
  • Hammond
  • Cinemag
  • Lundahl
• Employs a ground plane
• Optional Fairchild time constant add on

Features of the 660 Time Constant:

• Six preset time curves
• Fully assembled
• Option for Grayhill rotary switch

Price:

• $100 for PCB
• $75 for Fairchild 660 Time Constant or $100 for Grayhill model

More information:

• Available at www.dripelectronics.com
• Cases created by DIY-Racked