Hi again. I bought an old akai 1135 35watt per channel at goodwill for 25 dollars. WOW! It sounded great the first few times that day (no buzzing). Then buzzing in both channels. A few days later (now) The buzz is twice as loud when first turned on but then reduces itself back to the normal buzz level after about 10 seconds. I have been reading about starting with power supply caps. These caps say 6800uF 50wv nichicon 90106 except when I put that number into the computer the capacitors look MUCH smaller for sale (in size). These stand about 3 inches tall and 1.5 inches across just by a quick look. I also noticed a dark black line on one of the caps where the lead is (negative?) wire hooks to. Does this mean anything? It is not bulging or anything. Is this where I should start?