Condition: Used, Excellent

Engineered for heavy-duty low-end performance, the Ashdown Geezer Butler Head of Doom delivers 600 watts into a 4-ohm minimum impedance. Weighing 10.5 kg with physical dimensions of 434 mm × 280 mm × 140 mm, its hybrid design pair a solid-state power section with a single 12AX7 preamp tube. Input stages feature High (3.9MΩ, 150mV) and Low (10kΩ, 300mV–40V p-p) instrument jacks along with a 22kΩ line input, producing a frequency response of –3dB at 17Hz–30kHz. I/O specifications include dual Jack/Speakon speaker outputs, a 600Ω balanced DI output (0dBu nominal), a 22kΩ tuner output, and a 22kΩ effects send/return loop operating on 115–230V power.

Handcrafted in the UK Custom Shop for Black Sabbath’s Geezer Butler, the Head of Doom delivers 600 watts of signature Ashdown tone with crushing power and versatility. Built on the flagship ABM platform, it features a 9-band EQ, Sub-Harmonic generator, and the unique Doom control, driving the 12AX7 preamp stage for rich harmonic distortion.

With dual inputs for passive/active basses, twin illuminated VU meters, footswitchable EQ settings, and full pro connectivity - including DI, FX loop, line in/out, and dual Speakon outputs - it’s a powerhouse built to command the stage with authority and unmistakable style.