Add to Cart Compare Quick view Lindell Audio Lindell Audio Retro 500-Series Microphone Preamp & Equalizer Now: $599.00 Was: The RE-51 is a preamp and EQ module for the 500-series built around the acclaimed OPA1731 vintage opamp. Usual perks such as polarity reverse and phantom power are easily switchable, but... Now: $599.00 Was: Add to Cart Compare Quick view