Retro Instruments 500PRE - Mic Preamp Module with Limiter for 500 SeriesFor the 500PRE, Retro's designers took the circuit topology of the Sta Level and packed it into a single width 500 module. The 500PRE three tube gain stage exhibits the same detail and depth. As with all Retro products, the feeling of the musical performance is delivered with the Retro Instruments 500PRE. Distortion, Noise and Frequency Response of the 500PRE are outstanding; but overload characteristics are not generally revealed by standard