“If you’ve ever wondered what unobtanium looks like in amp form, this is it”: Played and revered by Stevie Ray Vaughan, Carlos Santana, and John Mayer, Dumble amps have an almost mythical reputation. But what’s all the fuss really about?

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The late Alexander Dumble built only a handful of meticulously crafted, much-sought-after amplifiers every year – and they ended up in the backlines of many of the greatest guitarists of all time. So where exactly did the magic come from?