The difference that properly functioning capacitors can make is often pretty amazing :-) I once chased distortion in a Hi-Fi preamp for a long time before replacing the filter capacitor. The capacitor hadn't shorted, but one section of it had little capacitance left and was the distortion source.
After that, my repair/restoration mantra became "always fix the power supply first."
After that, my repair/restoration mantra became "always fix the power supply first."
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