What model is it? 12/14/24?
List some info...model and power requirement tag on the back or a photo.

There's one on Ebay mixer+PSU for like $50. It's in UK so shipping might be high.
Maybe they will sell you the PSU...
You would be better off buying that. Spare parts, manual etc etc.
You probably couldn't build a supply for less than that!
Do you have the manual, schematics?

Thanks for the info...it's a 32x8. We do have the manuel and schematic.

OK, so what is the PSU power requirements and voltages?
Are you looking to build this yourself or looking for someone to build it for you?
Short of finding one used....PSU modules can be found on Digikey or Mouser as open frame units.
Select the voltage and current needed and wire them up.
+/-15-18VDC/3A module go for about $150.
If you need phantom power a +48VDC module is around the same price.

I have built two PSUs for the Soundtracs Topaz 32x8. I have been working on getting a page up and running on the subject, you can check out my project page here.
[[url=http://[/URL]="http://www.onestone…"]OSW Topaz PSU[/]="http://www.onestone…"]OSW Topaz PSU[/] . Have you contacted Steven Magalnick, through his website...The Soundtracs Guy. He has the schematic that you will need to follow.