This Preamplifier Control System uses an electronic potentiometer as used in all current Audio Research Preamplifiers, unlike other common volume control chips this device does not contain a build in op-amp. The Preamplifier Control System consists of two PCBs: Audio PCB: 1. 2 channels 2. 5-way input switching, and 3. Volume control, can be configured as mono balanced or stereo single ended Features: 127 step volume control from -52dB to 0dB attenuation with 12 LED level indicators 5 Inputs with LED indicators Remote control via universal remote control (RC5 code) Options for shunt operation (-46dB to -3dB or -52dB to -6dB or -66db to -15db) 5 way Silver alloy relay input switching LED’s driven on/off, not “multiplexed” to remove digital noise Audio PCB includes option for fitting two LSK389B Zero FeedBack J-Fet buffer (direct coupled – no coupling capacitors) to make a stand alone buffered passive preamplifier with <50Ohm Output Impedance must be used together with a controller and ps.