Audio Designs & Manufacturing (ADM) 668 Microphone Preamps

Here's a pair of ADM (Audio Designs & Manufacturing) preamps, racked by the late audio guru Norman Druce in Detroit. These were part of the ADM 700 modules from their high-end mixing desks, which were manufactured in Michigan in the late 60s. The 668 preamp is an all-discrete transistor design with UTC 0-17 input transformers on each channel and sounds amazing in a very flattering, coloured way. Each channel features phantom power and phase reverse, with a coarse gain and trim knob. Those who know, know these are great preamps which are on par with Neve, API and Electrodyne products of the same era. Thanks for looking!