Chandler Limited REDD.47, 1-Channel Tube Mic Preamp based on the Premap of the EMI REDD.51 Console, Tubes: EF86, E88CC (input/output), Gain: 6db increments, stepped, fine: variable +/-5db, +57db Total Gain, Rumble filter: Inductor based, switchable (30,45,60,70,90,110,130,180hz), 20dB Pad switchable, Phase switchable, +48V Phantom Power switchable, Transformer balanced I/O (custom wound), Inputs Mic/Line XLR balanced, Hi-Z 1/4" TR Jack, Line-Out XLR, internal Power Supply, Dimensions: 19" 2U