Head Of Doom - Geezer Butler
Ashdown Geezer Butler Head of Doom Left
Ashdown Geezer Butler Head of Doom Rear
Ashdown Geezer Butler Head of Doom set up with cabinet and bass guitar
Ashdown Geezer Butler Head of Doom Technical set up

Ashdown Engineering

Head Of Doom - Geezer Butler

£1,499.00

Please note: All UK-built products are made to order. The approximate lead time is 20 days.

For more information, please email: info@ashdownmusic.co.uk

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.

Pairs well with

Ships within 1-2 business days (UK Customer Orders Only)

5 Year Warranty

Engineered to Last, Trusted by the Best

Product Specifications

POWER

• Power Output: 600 Watts
• Power Requirement: 115–230 Volts
• Output Tubes: 1 × 12AX7

CONNECTIVITY & I/O

• Speaker Outputs: 2 × Jack/Speakon outputs
• High Instrument Input: Impedance 3.9MΩ, input range 150mV
• Low Instrument Input: Impedance 10kΩ, input range 300mV – 40V p-p
• Line Input: Impedance 22kΩ, input level 0dBu nominal
• DI Output: 600Ω balanced, Level 0dBu nominal
• Tuner Output: Impedance 22kΩ, Level 0dBu nominal
• Effects Send: Impedance 22kΩ, Level 0dBu nominal
• Effects Return: Impedance 22kΩ, input level 0dBu nominal

PERFORMANCE

• Frequency Response: –3dB @ 17Hz – 30kHz
• Impedance: Minimum 4 Ohms

DIMENSIONS & WEIGHT

• H × W × D (mm): 434 × 280 × 140
• Weight: 10.5 kg

Power to Shake the Earth

The Head of Doom boasts a 600-watt RMS power section designed for uncompromising low-end authority. With dual Neutrik Speakon outputs and a minimum load of 4 ohms, it’s built to handle anything from a single 8-ohm cabinet to a full wall of doom-inducing enclosures. A dedicated slave input allows for multiple heads to be linked together, multiplying your sonic power and cementing its name as the ultimate weapon for bassists who refuse to be ignored.

Dual VU Monitoring

A defining feature of the Head of Doom is its twin VU meters - the first Ashdown head to showcase both input and output levels side by side. The input VU meter ensures you always hit the sweet spot for your bass, while the output VU keeps your stage levels under control. Backed by a powerful 9-band EQ and a Shape control, bassists can craft tones ranging from tight and punchy to dark and thunderous, all while keeping precise visual monitoring at their fingertips.

Professional Connectivity

Connectivity is at the heart of the Head of Doom. It features a tuner out, DI out, transparent FX loop, and line input for integrating samplers or external sources. Output muting silences the DI while keeping the tuner out live, allowing for silent tuning on stage. A pair of Neutrik jack/Speakon sockets ensure flexible cabinet pairing, while three transformer-isolated outputs provide professional-grade options for recording or running multiple rigs.

The Doom Control

The aptly named Doom control pushes extra current through the amp’s 12AX7 preamp valve, unlocking rich harmonic distortion tailored for bass. From subtle grit to full-blown growl, this feature transforms your tone into a force of nature. Best of all, the Doom control can be pre-set and toggled via footswitch, giving you on-demand access to crushing overdrive that retains low-end power and clarity.

Geezer Butler’s Legacy in Sound

User

manual

CLICK THE IMAGE ABOVE TO DOWNLOAD THE USER MANUAL

FAQs

Please read our FAQs page to find out more.

How Long Will My Order Take To Arrive?

Orders placed before 3pm (Monday-Thursday) are dispatched on the same day. UK Customer orders are shipped on a next-day delivery service via TNT.

Do You Shop To Outside Of The UK?

Currently, we do not facilitate orders to outside of the UK. If there is a specific product that you are after, be sure to check our Dealer Locator to find your closest Ashdown dealer!

If you cannot find a local dealer, please do not hesitate to get in touch and we will try and assist!

Do Ashdown Products Come With A Warranty?

Yes! All Ashdown product purchased include a 5 year warranty, giving you peace of mind and long-term support.

For more information on warranties, visit our Warranty Info page!

Where Can I Buy Ashdown Spares and Accessories?

Spare parts, footswitches, and accessories can be purchased directly through our in-house service team. If you're looking for something specific, our team will be happy to point you in the right direction!

How Can I Contact Ashdown Support?

Our passionate UK-based team is always ready to help. You can get in touch by phone or email, and we'll be happy to assist with any questions.

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