I got this amp 2nd hand and it has no output. Somebody has had the circuit out and cut off the ground prong and 2 screws were missing for mounting the pcb into the chassis. The power supply works. The power transformer is center tapped with a DC full wave rectified and filtered output of 32V. The unit uses 5 4558 opamps and a TDA2003 amp. I am suspecting that somebody may have installed the TDA2003 ic in replacement for something else because the TDA2003 operating voltage is 18V max and it is connected directly to the 32V. The board is laid out for a 5 pin power amp ic. I am not able to find a schematic for this but have spent hours making up my own. Any help with this from any of you with experience would be much appreciated.