After some extensive work the Pioneer SX-838 is almost sonically finished being restored. The power supply, EQ, protection, and power amp boards were recapped with Nichicon premium electrolytics and Panasonic ECQ film for low capacitance caps. On the power amp board the 2SC1451 and 2SA726 transistors were pulled and replaced with modern equivalents. To gain access to the power amp board the outputs were pulled along with the heat sink. All were tested and reinstalled with new thermal paste. All that remains is the control amp board which will be done when removing the faceplate to clean and lube controls. Some lamps need replacing as well. Below are some before and after shots.
