Pair of RCA BA71b racked mic preamps RARE! Description : 2 channels of racked RCA BA71b preamp modules. Phase switch, -15db pad and phantom power. Tested and working as they should.I wish i could keep these but I need to make room for my new 500 series rack, my loss is your gain (no pun intended) These are fairly rare and you don't see them come on the market often especially already racked and ready use. The item "Pair of RCA BA71b racked mic preamps RARE" is in sale since Sunday, February 12, 2017. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "sixteentrax" and is located in Concord, California. This item can be shipped to United States.