The DOD Overdrive Plus FX50B may be derived from the well-loved 250 Overdrive Preamp and the original FX50 Overdrive Preamp, but the FX50B has a power all its own, taking you into higher gain territory than ever before. This preamplifier distorts your input signal and sustains your notes for a heavily overdriven sound and more upper range distortion. Though it went out of production in 1998, the DOD Overdrive Plus FX50B is a great, inexpensive pedal to add to your tonal library.