Often times in recording studios you can find vintage equipment which is still very valuable and in demand, but has long since been discontinued (and unsupported) by its manufacturer, or whose manufacturer is long since out of business. Sometimes when replacement parts are unavailable, we have to build our own.

This example shows (below) an original PCB which was irreparably damaged by contaminated flood water, and (above) a copy that Eisen Audio was hired to draw.