Noob --hello

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Just joined hoping to find some answers on project I'm taking on. I have a few Nikko amps, one of which I recently changed out the burnt out lamps (I thought I'd start with something simple). Another older receiver I have (Sherwood S7110B) has a slight hum in the background and thought I would start replacing some capacitors, starting with the power supply. There are two 38v 6800uF caps. I looked on a few sites and as I guessed, can't make heads or tails out what is all available. Aside from the values on the side of the original cap, how do I know what type of capacitor it is? There is also "CEO2W" indicated as well as a directional indication of polarity. Looking forward to poking around on the site.
 
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