The good thing about electrolytic capacitors is that the ultra-narrow plate spacing means that we can pack an awful lot of capacitance into a small capacitor. Alas, electrolytic capacitors have some serious drawbacks...
The electrolytic goop is also a fairly awful conductor. This means that it tends to distort any fluctuating signals applied to the capacitor. As a result, electrolytic capacitors are fine as charge stores for power supplies but are poor as components in a hi-fi system when their non-linear behaviour tends to distort the musical signal.
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University of St. Andrews, St Andrews, Fife KY16 9SS, Scotland.