I have been waiting to utilize a Welborne Labs Reville passive amp that I built a long time ago. With help from Roy I have an sp14 chassis, i/o controls from the reville, khozmo attenuator (waiting for the knob), mundorf and jupiter caps, B+ electrolytics replaced with film caps, some resistor upgrades, psvane CV181z and sylvania chrome dome tubes and all inside a flame cherry cabinet. Running from a mac mini, glyph studio drive through a TeddyPardo DAC into Welborne Laurel amps and klipsch cornerhorns. Sounds fantastic!