AC Sound PRR 176 Vari-Mu Compressor

Projects > AC Sound PRR 176 Vari-Mu Compressor

The PRR 176 is a two channel (stereo or dual mono) amalgam of the UREI 176 vari-mu compressor and the sidechain designed by GroupDIY member PRR.


  • Option for receiver chip or transformer-balanced input
  • Option for driver or transformer output
  • 6BC8 vari-mu tube
  • DIP8 and DOA footprints for all opamps in the signal chain
  • Board accepts Cinemag and Edcor transfomers, option to wire in Jensens and Lundahls
  • Fits in a 1RU chassis!


    Kits and front panels will probably be offered in the near future (as of 8.3.11). Price has not been established yet.