Ashdown Head of Doom Geezer Butler Signature Bass Amp Head HOD-600-UK

Holiday Priority Processing • Limited Allocation • In Stock • Ships Now

Price transparency: MAP pricing for this model is $1,699. This $1,849.99 premium retail price reflects a Holiday Priority / in-hand offering and accounts for the real cost of expedited processing, expedited shipping, and secure handling of a high-value, limited-allocation amplifier during peak shipping season. This Holiday Priority price is optional — customers who prefer MAP pricing may contact us directly to discuss standard processing options when available.

Stock note (as of Dec 15, 2025): This Ashdown Head of Doom (HOD-600-UK) is in stock and on hand — ready to ship immediately. These UK Custom Shop amps are produced in limited runs and are rarely available for immediate delivery.

Expedited processing & shipping: We will prioritize handling on this order and ship it as quickly as possible. Orders placed by 1:00 p.m. (local time) ship the same business day (business days). Tracking is provided immediately once the unit leaves our shop.

Delivery note: Final delivery timing is ultimately dependent on carrier performance and service conditions, but we do everything on our end to keep this shipment moving quickly and securely.

Important: As holiday shipping demand increases, carrier rates and time-definite service availability increase as well. This pricing reflects the current holiday window and may change as shipping conditions tighten.

Availability: This is a limited-allocation, in-stock unit. This piece will not last long. Once sold, additional availability will depend on future UK Custom Shop production and existing backorders.

Shipping protection & delivery requirements: For your benefit, we strongly recommend adding optional SureBrite Shipping Protection and SureBrite Extended Warranty Protection at checkout. Due to the value of this item, it will ship with a signature required unless you explicitly request otherwise. Please provide any special delivery instructions (business delivery notes, gate codes, “hold at location,” etc.) at checkout or by contacting us immediately after purchase.

Address restrictions: Expedited service applies to continental U.S. street addresses only. PO Boxes, APO/FPO, Alaska, Hawaii, and U.S. territories are not eligible for time-sensitive expedited delivery services.

Authorized dealer & warranty: We are an official Ashdown dealer. Your purchase includes the full manufacturer warranty, plus any optional SureBrite coverage you choose.

Local pickup / buy local option: Local pickup is available by arrangement, and local customers may qualify for special “buy local” pricing. Email info@ecgmusic.com to arrange pickup or inquire about local pricing options.

Geezer Butler – Black Sabbath Signature Amp

Ashdown “Head of Doom” Twin VU 3U Rackmount Bass Head — 600 Watts
Designed, tuned, and stage-tested with Geezer Butler.

Availability

In stock now: This unit is on hand and ready to ship. Limited UK Custom Shop allocation — once sold, restock timing depends on the next production run and existing backorders.

Product Overview

Elevate your bass tone with the Ashdown Head of Doom Geezer Butler Signature Bass Amp, built in collaboration with the legendary Black Sabbath bassist. Handcrafted in the UK Custom Shop, this 600-watt powerhouse is based on Ashdown’s flagship ABM platform, delivering the thick, driven low-end and articulation Geezer is known for — with the reliability touring players demand.

The 9-band EQ (Bass, Middle, Treble + six sliders) gives you total control over your sound, while the Sub-Harmonic Generator layers an octave below your note for massive depth and stage-shaking presence. With dual instrument inputs for passive and active basses, this head adapts effortlessly to any rig.

A signature visual touch: twin VU meters — the first ever on an Ashdown amp — provide real-time output monitoring and a killer stage look. Add in tube-driven harmonic distortion via a 12AX7 preamp valve (footswitch-controllable), and you’ve got everything needed for crushing Sabbath-grade bass tones or modern high-headroom clarity.

Key Features

• 600W ABM-based power with Geezer-approved voicing
• UK Custom Shop build
• Twin VU meters for visual output monitoring
• 9-band EQ for precise tone shaping
• Sub-Harmonic Generator for huge low-octave depth
• 12AX7 preamp valve with adjustable harmonic distortion
• Footswitch control for drive/tone functions
• Dual inputs for passive and active basses
• Pro connectivity: DI out, tuner out, FX loop, line out, dual Speakon outs

Specifications

• Power Output: 600 Watts
• Power Requirement: 115–230 Volts
• Speaker Outputs: 2 × Jack/Speakon outputs
• Frequency Response: –3dB @ 17Hz to 30kHz

Inputs / Outputs

• High Instrument Input: 3.9M Ohms, 150mV range
• Low Instrument Input: 10k Ohms, 300mV–40V range
• Line Input: 22k Ohms, 0dBu nominal
• DI Output: 600 Ohm balanced, 0dBu nominal
• Tuner Output: 22k Ohms, 0dBu nominal
• Effects Send: 22k Ohm, 0dBu nominal
• Effects Return: 22k Ohms, 0dBu nominal
• Minimum Impedance: 4 Ohms
• Preamp Tube: 1 × 12AX7