CLASSIC API: http://www.classicapi.com
JAMES: http://www.customanalogservices.com
The Heider FD312 is a special and unique preamp module that stands out in today’s crowded 500 series market. The preamp stage has been carefully modeled after the preamps in the famous Wally Heider Recording Studio 4 console custom built by Frank DeMedio circa 1972. The original pre’s were stock 312 cards slightly modified by DeMedio. Frank’s mod was centered around removing the (1:7) AP2622 input transformer and replacing it with a custom wound Ed Reichenbach (1:8) RE-0887. The only differences to the audio path are how DeMedio treated the RE-0887. He removed the commonly used 1000pF decoupling capacitors found on the AP2622’s primaries. He also removed the Zobel network from the secondary. Instead of a typical Zobel network he used only a low value load resistor. Besides being just enough to safely dampen any high frequency ringing, this load resistor creates an unusually low input impedance and a slightly higher than typical THD. All of this geek talk equals a very special tonal quality with some of the most buttery smooth mids you will ever encounter! CineMag has done a fantastic job with the current RE-0887’s, working straight off of Ed Reichenbach’s original notes and winding data from 1972. For those who don’t know, Ed Reichenbach’s son Tom went on to form CineMag in 1979 after working with his father for some 25 plus years. I am so very glad they kept all of the old notes!
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