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i was always told yrs ago to stay as close as you can to the orignal value in most applacations , when talking of voltage higher was always better not over board though like a 500 volt cap when all you need is 25 volts circuit . when it comes to mfd its best to stay as close to the orignal value ,like if the orignal is 20 mfd you use 22mfd or 50mfd you could 60mfd but would really not go any higher , it kinda also depends on what the circuit is, in power supply circuit's you have alittle more freedom . like useing 47 mfd in place of 50 mfd is fine also ,if you have a digital cap. tester and measure it most of the time it will be over 47mfd any way it could read anywere between 45-51 mfd depend on the caps tolerance rating 10 / 20 % and it can also change after is been hot or used for awile . before i replace a cap i test the new one pretty good first its mfd ,then leak test , just because its new doesnt make a good one under working conditions . for the heck of it i got some of though's resister's off ebay the ones that are real cheap ,i checked them for expl. a 10 ohm was really 23 ohm everyone was so out of the ball park it was like they put the wrong color band on it. what happens to it after it get's hot i wounder l o l .
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