The mic pre is complete.

Detail of the Lundahl mic input transformer, Forsell discrete op amp and big-ass 40uF polypropylene output capacitor.

Looking from the back, you can see how I wired the gain pots, phase switch and phantom power switch.

Yes, I know my internal wiring needs attention.

The finished mic pre in the rack. The two blue phantom power LEDs don't have the same brightness, but I'm just going to live with that for now.

Here's my final mic pre schematic. The input phase switch and phantom power circuit is not shown, but is based on Jensen mic input design AS016. Click here for the discussion thread on this project.

A schematic of the API 312, a vintage preamp design my circuit is based on.