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Measurements

Have you measured the frequency response of your PAS? Have you ever looked at internal signals with a scope to determine whether it might be clipping on higher-amplitude bass passages? Sometimes it's simple old age that degrades this gear; switches and pots don't last forever. I would personally never buy a 40-year-old preamp for exactly that reason. There's also the fact that the PAS wasn't a great design, even new. All things considered, it's not surprising that your passive replacement sounds better.


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