Ruby is the perfect recreation of D.W Fearn's stellar VT-5 Vacuum Tube Stereo Equalizer, bringing your productions the same articulate, elegant and expensive tone as the original unit. The original hardware equalizer uses passive LC circuitry with class-A triode vacuum tube stages for the input and output. The input transformer is made by Jensen. The output stage utilizes the same custom Jensen transformer used on the VT-1/VT-2 mic preamps.