Karl Alvarez

He played a short scale Squier Vintage Modified Jaguar Bass live.

As you can see, Karl is playing this bass in the picture.

Can be seen behind him in this picture with an Ampeg cabinet.

Karl Alvarez uses the Ampeg SVT-810E 8x10 Bass Cabinet, as seen in a user-uploaded photo on Discogs.

This is a Parts caster bass Karl has used since the late 90s, according to Karl it belonged to a friend of his and she gave him the bass, it originally was a parts bass with a fender neck, and in Olympic White with a Black pickguard. Around The Reunion and specifically the FunFunFun fest the same bass can be seen with a new white Pickguard, Seymour Duncan SPB3 pickups, and some Les Paul style gold knobs and he played this bass off and on up and changed the neck to a squire jaguar neck sometime in between until in 2021 when he brought out the bass in a new Charcoal Frost finish to mimic stephens guitar with a new black Pickguard. This bass was also used for the recording of Cool To Be You, Merican, and Hypercaffium Spazzinate and Problematic

Karl used this bass along with his white Fender Jazz bass HH on the tour for Hypercaffium Spazzinate in 2017

In this video, Karl uses a G&L Asat in Silver sparks. I don’t know if it’s USA or Not. He also used it for the recording of Pummel and In the music video for Million Bucks, and the Live Performance on Conan

Karl during the 80s and 90s used a fender p bass. He used it starting at the recording of “Allroy Sez” and “Allroy for Prez” and after the recording of those album modified it with a J pickup in the Bridge and used it in this configuration to record the Following Albums - Allroy Saves - Percolator - Breaking things

This bass can be seen in live footage from this Era but most notably can be seen in the videos for “Shreen” And “Dot”

Karl Alvarez is confirmed to use the Ibanez Roadstar II Bass during his tenure with the band Descendents, as evidenced by live footage from their 1987 performances. An image supporting this can be found on Equipboard.

Karl Alvarez is confirmed to use the Music Man Stingray bass guitar, as evidenced by its appearance in the Descendents' "I'm The One" music video from the album "Everything Sucks." The video is available on YouTube through Epitaph Records.