The reviews are in and the Positive Grid Bias Amp is a hit! It's simply one of the most versatile guitar amps ever invented. It's designed for every one. From the guitar player that is always looking for more options to the folks looking for a realy hi-fi, audiophile experience, this amp will do it! Designed to be used intuitively with only using the front end controls or with their powerful suite of software, anybody can make this amp sound good. It's in basically brand new condition and even includes the original box. Call or email with more questions. We're here to help you out!