Recreation of the original valve line amplifiers used in Abbey Road Studios’ heralded and rare EMI REDD.51 recording consoles circa 1959-1968. EF86, E88CC Tube Circuitry Custom-wound Balanced Transformers Mono Channel 16-52dB Voltage Gain ±5dB Fine Gain +57dB Total Gain Variable Output Control Switchable Inductor-based Rumble Filter (30,45,60,70,90,110,130,180hz) 20dB Switchable Pad 0/180º Switchable Phase +48V Phantom Power Dimensions: 19” (1U)