Wikipedia: "For most of the record [American Idiot], Dirnt used an Ampeg SVT bass amplifier, recording with his signature bass and a Precision Bass. For the album, he and Cavallo strived for a "solid, big, thunderous" bass sound as opposed to one centered on countermelodies." The amp looks like the late 60's - early 70's SVT's, without logo. In photo (taken in August 2003), treble knob appears to be removed.more
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