of an electric guitar or its amplifier) At volume setting 10 (the loudest).
1998 January 6, Rory McQuillan, "Gear: Does anyone use tone controls on their guitar?", bit.listserv.blues-l, Usenet, "I asked […] how they adjusted the tone controls on their guitars. They both told me the same thing, that they dimed 'em and adjusted their tone at the amp."
simple past and past participle of dime
Presumably from dime (“the U.S. ten-cent coin”) + -ed.
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