Alan Sparhawk

According to Guitar Geek's rig diagram, Sparhawk uses Vox V15.

"Right now, it’s a Les Paul with P-90 pickups & a bigsby trem into a Z-Vex Octane 3, an SIB Mr. Echo, a Z-Vex Lo-fi Loop Junkie, & then a Z-Vex Super Hard On. Amps vary, but I like the 1965 reissue Fender Twin with the 15 inch speaker, &/or a Traynor Bassmaster head into a 1x12 cab. With Low, I’ll use smaller amps - a Carr Mercury, Fender Vibroverb, or just a Champ."

A Roland JC-50 can be seen in Alan's rig in this photo from a Low concert circa 2013.

In an interview with Silbermedia, Alan Sparhawk discusses using the Carr Mercury amplifier during his performances with Low and Retribution Gospel.

According to Guitar Geek's rig diagram, Sparhawk uses Fender Vintage Vibroverb.

In this thread on offsetguitars.com, we can see a photo of Alan's amp setup, comprising of a Tweed Vibrolux and a Roland JC-50.

https://www.offsetguitars.com/forums/viewtopic.php?f=10&t=64204&start=30