Nirvana
Cobain used an Electro-Harmonix Small Clone chorus into a clean amp for this iconic riff. The chorus effect is the tone.
The defining riff uses an Electro-Harmonix Small Clone to create the watery modulation Butch Vig specifically associated with the track. The exact guitar and clean amplifier have never been conclusively identified, although a Japanese Fender and the Vox AC30 from the Nevermind sessions are credible choices; settings are approximated from that documented equipment. Source: Guitar World’s Kurt Cobain gear guide and Ground Guitar’s Nevermind breakdown.
