For sale is a Heil PR30B, one of the best-kept secrets in guitar recording and a serious upgrade from the usual SM57-on-a-cab approach.

The PR30B has earned a reputation among engineers (myself included!) for delivering the punch and detail of a dynamic microphone while retaining the smoothness and natural midrange often associated with ribbon mics. Its large low-mass diaphragm, powerful neodymium magnet structure, and exceptionally wide frequency response allow it to capture the full character of an amplifier without the harsh upper-mid spike that often requires heavy EQ later in the mix. For my money, this mic sits effortlessly in a mix, requiring little tweaking once the track is laid down.