Power supply - main section Return to article Power supply comprising from the right, 240V input and filter, transformer, rectifier board and +/-18V pre-regulator board which then feeds the Sulzer-Borberly precision +/-15V regulator board. Entire section is shielded with both copper and steel with an extra 10mm of mild steel plate next to the transformer and 240V socket. This is a framed page so if you can't see a Contents page to the left then you need to Click Here in order to navigate this site.