Soundtracs Topaz 12 4 Manual -

These DIY communities are goldmines. Register for free and search their "Analog Line Level" and "Lab" sections. You will find threads where members have re-drawn the power supply schematic and corrected errors in the original manual. They often have scanned manuals attached directly to posts.

The Soundtracs Topaz 12-4 was a compact analog mixing console released in the mid-1990s. It was designed for home and project studios, offering a "warm" British sound and 4-bus architecture in a rugged, fanless frame. The Tale of the "Dusty Blue" Console Soundtracs Topaz 12 4 Manual

The Topaz 12/4 uses a 5-pin XLR connector for its external power supply (usually the PS-424 or PS-450). Without the manual, you won’t know the pinout. Here it is, verified by multiple owners: These DIY communities are goldmines