April 2017
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Timeline Lynx modules

The company went away quite awhile ago but Lynx modules are still a good way to resolve your multitrack transport to an external clock. I scanned the Lynx I operators manual in two sections:

lynx-man-1.pdf

lynx-man-2.pdf

Here are the cable schematics:

lynxi_iischem.zip

API 550A EQ schematic

I finally got ahold of a hardcopy 550A schematic. The one that is floating around the internet is pretty much unreadable. I scanned it at a higher resolution for you.

550a.pdf

Studer A820 firmware 0491

We copied the latest Studer A820 firmware revision from existing EPROMs. I actually had to bust out my Commodore 64 EPROM burner to do it. It still works! You can download the EPROM images and burn your own. I wrote a simple C program to compare the checksums of the images to the ones given by Studer. They all checked out.

a820softwareupdate0491.zip