Vintage MXR Phase 90 help!

High Pedality

So I received this from eBay today. The phase effect is extremely subtle. Like, no lows whatsoever in the sweep. Just the high, little swoosh before the phase starts over. It's from 79'. I've played a 78' recently that sounded like a dream. Really full and lush. I messed with the trimmer inside but it just made it even more subtle. Any advice?

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