According to [this article](http://www.dolphinmusic.co.uk/article/2840-the-beatles-effects-pedals-guide.html) from Dolphin Music, "Another fuzz pedal the Beatles have used was an WEM Pep Rush, reportedly used on the Paperback Writer recordings. There is a photograph, taken around that same era, shows Lennon fiddling with the Pep Rush fuzz pedal."more
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