Sam Kiszka

In a Premier Guitar Rig Rundown video, Sam Kiszka mentions using the Fender Super Bassman Pro 300W Tube Bass Amp Head, noting that it's from either 2012 or 2013.

Can be seen behind Sam, with Sam also commenting "Missing my #acoustic360" On Jakes' profile and throughout early GVF's Instagram posts this amp can be seen

Can be seen sitting behind Sam during this live performance of 'Talk On The Street'

In Greta Van Fleet's Rig Rundown video, Sam talks about his amp head but not much about the cab. From the video, it looks a lot like the bigger 8x10 rather than the 6x10. The cabinet is also mentioned in 2021 Guitar World.

My main sound is the Acme Motown DI tube interface, which Al Sutton makes. It’s fantastic; it puts the sound of the bass right in the spot where you want it. It sits back enough, but you can hear all the intricacies of the tone. We run that into a silver 1964 Fender 50-watt Bassman for a little more growl. You don’t have to crank it at all.

Sam Kiszka uses the Fender Bassman® 810 Neo Enclosure Cabinet, as confirmed by the "Rig Rundown: Greta Van Fleet [2021]" video by John Bohlinger on Premier Guitar. The cabinet is paired with his Fender Super Bassman, which features 300 watts, four 12AX7 tubes, and six 6550 power tubes.

In a Rig Rundown with Premier Guitar, Sam Kiszka is confirmed to use a vintage Sunn 2000S Amplifier Head, capable of delivering up to 280 watts. It features a solid-state rectifier and four 6550 tubes, and it is connected to a vintage Sunn 2x15 cab.

Sam Kiszka is confirmed to use a vintage Sunn 2000S amplifier head, which includes a solid-state rectifier and four 6550 tubes, paired with a Sunn 1960s Sunn 200S 2x15 Speaker Cabinet. This information is supported by the "Rig Rundown: Greta Van Fleet [2021]" by John Bohlinger on Premier Guitar.