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Originally Posted by RetroHacker
I don't know what problem the amplifier had to warrent new transistors, maybe he was trying to solve the weak sound issue too.
-Ian
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He should have attacked the small electroytic caps. Most if not all of them probably have dried out and drastically decreased in capacitence. That will make the sound "thin", "frail" and kill the bass. Replace all of them, one at a time, and pay attention to the polarity. Any value within 20% of the old value, and equal to higher voltage rating will be fine.