Kurt Cobain

Kurt played a left-handed Mosrite a lot. He had a Mesa Boogie amp, and we rented a Fender Bassman, a Vox AC3O and a Marshall stack which we didn't really use.

In this interview with Kurt's guitar tech, Earnie Bailey, he explains that Kurt used a Fender Baseman Quad and a Marshall Plexi 100 during the "In Utero" recordings.

In early January 1990, Kurt Cobain began using three Sunn Beta Lead amplifier heads, primarily paired with unidentified 2x12 speaker cabinets. These amplifiers became his main choice during Nirvana's February-March Bleach tour and were used until Cobain destroyed them on May 1, 1990, at The Cat's Cradle in Chapel Hill, NC. The following day, he switched to a Mesa Boogie Studio Preamp and a Crown Power Base 2 Poweramp, along with an Aria Pro II Cardinal Series CS-350 guitar, for a performance at The Milestone in Charlotte, NC. From May 2, 1990, to March 1, 1994, the Mesa Boogie Studio Preamp remained his primary preamp, initially with the Crown Power Base 2 until December 31, 1991, and later with the Crest Audio 4801 Poweramp, which he used for the rest of Nirvana's career.

Before the American In Utero tour, Kurt's guitar tech, Earnie Bailey, gave Pat Smear the Mesa Boogie Studio Preamp that Kurt had purchased in May 1990, along with an additional unit. Cobain then received two new Mesa Boogie Studio Preamps and an extra Crest Audio Poweramp to ensure uninterrupted performances. This information is supported by a user-uploaded photo.

Kurt Cobain used a modified Marshall 1987x Plexi 50 Watt, paired with a custom 2x12 speaker cabinet, to achieve clean tones on the "In Utero" album. This setup is detailed in a YouTube video by Aaron Rash titled "the INSANE amp Kurt Cobain used to record clean tones on in utero."

Kurt used a marshall JCM800 head. The amp actually belonged to Mike Johnson of Dinosaur Jr, for whom Nirvana opened up on june 17 at Crest Theatre, Sacramento, CA, and on june 14 at Hollywood Palladium, Los Angeles, CA. https://www.groundguitar.com/kurt-cobain-gear/kurt-cobains-marshall-jcm800-amp/

In this picture from February 1989 at the East Ballroom, Kurt can be seen using his partscaster Mustang alongside a Randall RG100ES Head, Soundtech 2x12 and a Marshall 4x12 cabinet

In the provided image, Kurt Cobain is seen using the Randall Commander RG-300 Head along with a 2x12 cabinet.