Profile: Conrad-Johnson Design, Inc. specializes in offering pre-amplifiers, amplifiers and phono amplifiers. GAT pr-eamplifier is a vacuum-tube, line-stage pre-amplifier that features input selection and level adjustment by microprocessor-controlled relays. ET2 is a remote-controlled vacuum-tube pre-amplifier designed to serve as the control center for high-performance audio and audio/video systems. TEA-2 triode equalization amplifier is a vacuum-tube phono stage, which eliminate the temporal inaccuracies that negative feedback introduces. Our vintage products include tube pre-amplifier, tube amplifier, fet amplifier and fet pre-amplifier.