Quad Eight Two Channel Mic Pre. Pro built using vintage discreet CA-137 cards and 3440 input transformers. Phase reverse, input pad, phantom power and impedance switches and DI Input. +/- 28 VDC linear power supply. Twelve postion Input Gain control and output Gain control.Very detailed sounding with not much color. The item "Quad Eight CA-137 Mic Pre" is in sale since Monday, January 15, 2018. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "rjbtechoo" and is located in Kearny, New Jersey. This item can be shipped to United States.