Thought this Pioneer SX-1010 was untouched but after checking out the power supply noticed it had previous service. Two caps and the voltage regulators at some point were all changed. Since these are the weak point of the amp it needs to be overhauled.
First all electrolytics removed and replaced with Nichicon PW. All transistors replaced with modern substitutes. Diodes and resistors checked with one leg out of circuit. After completed checked all pins and the power supply is back in spec.
