I have a used ART MP Studio, tube microphone preamp. Its cheap because you need a fresh 12ax7 tube the signal is weak. I have the original box and power supply. It has easy to read VU meter, its a limiter, Provides 60db of gain, controllable input and output gains, XLR I/o`s and 1/4 i/o`s it can be used as a DI box and has phantom power 48vdc. email Tony, its as is since it needs a new tube.