Schematic for RS2B L.F. Equalizer


I own a pair of RS2B. The L.F. Equalizer everyone keeps emphasizing as the ''essential'' component of the system got kaputt a few years back. I have been trying to find one, but the prices go well over the bar. So the question is as follows : Is it possible to get the schematic of this device ? If so, where can I find it ?