Used right after joining the Peppers in late 1988. The amp was a X-100B or X-60B head, connected to a pair of 4×12 Carvin cabinets. Based on the logo design, and speakers having black rings instead of white – the amp was made sometime in 1987.

At 1:23 of the video he can be seen with the amp stack. Vai used this amp for the recording of Flex-Able.

In this video, Daron can be seen playing a Carvin X100B, which he can also be seen playing in early System of a Down performances before switching to Mesa Boogie Rectifiers in 1998

This tweet, by Zappas Gear, includes a photo of Frank Zappa posing by an X-100B, and the caption reads, "#ZGPic #Zappa on Tour 1980s #Carvin advert - FZ poses with the Yellow Performance Stratocaster and an X-100B stack."

As seen in this ad using Carvin X-100B heads from this Pinterest post, during the "Go Off" album era. Further backed up on Carvin Museum's website: http://www.carvinmuseum.com/decade/images/89-vinnievincent.html

In this image of Head from the 90s, he can be seen playing an Ibanez Universe in front of a Carvin X-100B with a matching 4x12 cabinet.

As seen in this ad using Carvin X-100B heads from this Pinterest post, during the "Go Off" album era. Further backed up on Carvin Museum's website: http://www.carvinmuseum.com/decade/images/89-vinnievincent.html

"Next I got my green Charvel and played through Carvin X100B amps, also from what Frank was using on stage in the early 80's. I used that amp and an Ibanez UE 405 for the "Havin' A Bad Day" album. I remember that the delay in the Ibanez was main thing I used and it was mainly for the song "Electric Hoedown". I used this set up in mono."

Used during the Mark Slaughter years of Vinnie Vincent Invasion.

In this Reddit post, Nick states that he uses a Carvin X-100B into Emperor cabinets.

From the Carvin website: "The X100B series tube amps were a mainstay on many arena stages and MTV videos throughout the 1980's. Artists such as Frank Zappa, Craig Chaquico with Jefferson Starship, Warrant, Warren Cuccurullo with Missing Persons, and Steve Vai all played X100B amps."

Erik Turner is associated with the Carvin X-100B guitar amplifier head, as seen in a Carvin catalog image.