Corrected entry: When Marty is plugging his guitar in to the mega amp, the amplifier end of the cable is stereo (like you would use for headphones) and the guitar end is the correct mono connector.
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Correction: This is obviously something Doc Brown built himself, not an "off-the-shelf" item. For whatever reason he wanted, needed, or settled on a stereo connection in the amp.
Phixius ★