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Actually, I would check the ripple (A.C.) on the D.C. voltage sources with the volume up pretty high; this ripple voltage should be say less than 1% of D.C. voltage. If the caps were the problem and going bad in the power supply, I'd think you'd be hearing A.C. hum from the speakers.
More likely, your poor low bass issue is in the signal paths and most likely way out of spec electrolytics (check around the volume and tone controls, and pre-amp to pwr-amp coupling caps). A high ESR on a cap in the audio path will usually result in poor/decreased low end frequency response along with reduced audio power.
Tom (PK)
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