Piotr Wiwczarek

Peter is using that amp during live shows, connecting guitar processor to it.

Piotr Wiwczarek utilizes the Marshall JCM900 4100 100-watt 2-channel Tube Head, a renowned amplifier from Marshall Amps, known for its distinctive "crunch" sound. Marshall's amplifiers, historically favored by guitarists seeking powerful tones and volume, continue to be a staple in the music industry.

In a YouTube video by ksantyp77 titled "Peter VADER - Polaków Gitarowe Rozmowy - FILMIKI O GITARACH," Piotr Wiwczarek discusses purchasing the Mesa/Boogie Dual Rectifier Solo Head (Multi-watt) amplifier in 1994 from Grzegorz Skawiński's shop in Gdansk. Although he no longer uses this amp, Wiwczarek has explored other gear, including Ashdown equipment and the Polish LaBoga Mr Hector during U.S. tours.

Piotr Wiwczarek uses the Marshall 1960B 4x12'' Cabinet, a renowned piece of equipment designed by Marshall Amps. Known for its signature "crunch" sound, the Marshall cabinet has been a staple for guitarists seeking enhanced volume and tone. Details about Marshall's iconic amplifiers and cabinets can be found on their official website, highlighting their influence in the music industry.

In this YouTube video, you can see this amp being during the recording of "The Empire".

Around 4 minute mark, Peter talks about the recent addition to Vader's gear which is the Ashdown Fallen Angel head. Used during the recording of The Beast (2004).