Hi, It can only be a capacitor that has gone low in value.Have you got a schematic ? IF you have no test equipment get a 47mfd 63volt capacitor (or anything thereabouts 10 mfd 100mfd it dosent matter) and bridge any coupling caps in the Pre-Amp one at a time (Keep volume low and connect right way round).If you have circuit can tell you which ones to check.Just a thought, nothing like an open circuit pot on the tone controls ?
Hi vubkevin. For 6 electrolytic caps just replace them all and enjoy it for another 20 years. I recently did the same to a Rotel RX-980 bought cheap and it was worth the effort. Don't forget the PS caps, electrolytics have advanced spectacularly since that amp left the showroom. Worth the minimal cost.
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