Billy Howerdel - A Perfect Circle
* Guitars - Gibson Les Pauls, predominantly a 1960 Les Paul Classic Reissue. Plays Ernie Ball strings, with Dunlop 1.0mm Nylon picks.
* Effects - Custom rack built by Dave Friedman at Rack Systems.
* Cabinets - VHT Straight Cabinet / 4x12
* Lexicon MPX R1 Midi Foot Controller and Ernie Ball expression pedal
* Tuner - Korg DTR-1 Rack Tuner
* Rack - Lexicon MPX-G2 Preamp / Multi-FX / Looper, GCX Guitar Audio Switcher / Router, TC Electronic G-Force Multi-FX, TC Electronics Fireworx, DigiTech GSP-2101, Eventide Orville, Custom Audio Electronics line mixer and line transformer
* Amp - There is much debate as to the details of his "Naked" amp. It is certainly a one-off custom-made amplifier, but not much else is known. It has been claimed on Internet Discussion Boards that it is based on a Naylor SuperDrive preamp with a power section based on a Marshall JMP, but this should be taken with a grain of salt. His most recent amplifier is a Dave Friedman modified 1978 Marshall JMP-100 Superlead, modified for (at least) a master volume control, channel switching, and an effects loop. Adam Jones of Tool has mentioned in magazine interview having been introduced to another line of amplifiers by Howerdel, which may be the Diezel head amp included in Jones' equipment list from "The Tool FAQ" of toolshed.down.net
Billy has replaced his previous effects rig with an AxeFX Ultra made by Fractal Audio. He is also using Naked amps made by Dave Friedman of Rack Systems.
Guitars-1960 Gibson Les Paul Classic Reissue, also seen playing a les paul elegant, strung with ernie ball strings, both are tuned to C#(low to high, C# F# B E G# C#)
Rack Set Up- Furman PL plus power conditioner(providing power to every rack item), Korg ToneWorks DTR-1 rackmount tuner, Lexicon MPX-G2 effects processor, DigiTech 2101 processor, T.C.Electronics G-Force processor, and a Rocktron Rack interface to help him switch items.
Controllers-Lexicon MIDI RPX-1 midi controller to control effect changes and effect parameters.
Amps- Used to be a naked amp custom and VHT cabs, but during the major tv shows(Leno, Conan O'Brien) I've seen him play through Marshall amps and cabs.
Dunlop picks.
Slides-Dunlop (he thanks them in the album jacket)
His rack was most likely built by Dave Friedman of Rack Systems( a company that builds specific high tech racks and rack items) because he thanked him in the album jacket as well