Almost complete, almost correct schematics for the Tektronix ADA400A Differential Preamplifier. Reverse engineered from photos on xDevs.com.
Images are derivitive works of xDevs.com's images. Their policy is "All data presented here is free for grabs and use, without any warranties." I say the same about my images and schematics. I make no guarantees about the accuracy or safety of the circuits in the schematics.