The Ashdown Geezer Butler Signature is an Ashdown distortion pedal, currently around $234.01. Close alternatives include the Ashdown MAS GZR-Pod and the Ashdown John Myung Double Drive. It pairs well with the Swart Star-Base 1 and the Fuchs FBT 300.
Ashdown Geezer Butler Signature
Ashdown · pedal
The Ashdown Geezer Butler Pedal of Doom is a dual-channel bass distortion and preamp pedal designed in collaboration with Black Sabbath bassist Geezer Butler over 18 months. It features two independently switchable EQ stages, a 5-band active EQ, transformer-isolated DI output, and runs at 9V or 18V for adjustable headroom. The Clean channel delivers warm, vintage tube-amp-like character at low gain, while the Doom channel pushes into aggressive saturation and fuzz-laden territory. It suits doom metal, stoner rock, and classic heavy rock bass tones. Build quality is fortress-like with a 1.6mm steel enclosure. Best used as a bass preamp or DI unit as well as a tone-shaping drive, particularly for players wanting warm vintage saturation without sacrificing low-end presence.
What stands out
“At low to moderate gain the Pedal of Doom delivers genuinely impressive warm, tube-driven vintage coloration that evokes classic bass amp character with real depth and presence”
— from the reviews
“Best used as a bass preamp or DI unit as well as a tone-shaping drive, particularly for players wanting warm vintage saturation”
— from the listing
“Strong choice for doom and stoner rock bass players who want a studio-grade DI preamp with built-in drive, but”
— from the reviews
“the ashdown geezer butler pedal of doom is a dual-channel bass distortion and preamp pedal designed in collaboration with black sabbath bassist geezer butler over 18 months”
— from the listing
“However, many players note the high-gain Doom circuit does , with some finding it sounds more like a generic overdrive at high gain”
— from the community notes
- bass
- di
- doom
- high gain
- low gain
- drive
- eq
Good for
- Silent Recording
- Silent Stage
Price updated Oct 25, 2026
Genres the Ashdown Geezer Butler Signature is commonly used in
- Stoner Rock
- Doom Metal
- Alternative
cited
Inferred from shared tonal signals, not a stated genre tag. - Metal
cited
Inferred from shared tonal signals, not a stated genre tag. - Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Blues
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Ashdown Geezer Butler Signature
Swart Star-Base 1
Swart
40% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)
Where this leans bright, Swart Star-Base 1 answers back warm
Comes later in the signal chain
Fuchs FBT 300
Fuchs
37% matchpushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (saturated → tight)
Fuchs FBT 300 takes that saturated character and pushes it toward tight
Comes later in the signal chain
Laney RB3 Richter Bass Amp
Laney
35% matchThe Geezer Butler's doom-voiced bass distortion pushes the Richter's rehearsal-oriented EQ into heavier territory.
Comes later in the signal chain
Phil Jones Bass Compact Plus BG-450
Phil Jones
35% matchThe BG-450's clear, articulate headroom gives the Geezer Butler's doom-voiced bass distortion a defined amp platform.
Comes later in the signal chain
Laney Digbeth Foundry DBF100
Laney
33% matchThe DBF100's punchy, FET-driven preamp gives the Geezer Butler's doom-voiced distortion a tighter, cleaner front end to push into.
Comes later in the signal chain
Phil Jones Bass Compact 8 Cabinet
Phil Jones
32% matchThe Compact 8's clear, high-fidelity response gives the Geezer Butler's doom-voiced distortion a full, gigging-ready amp voice to push into.
Comes later in the signal chain
Fuchs FBT-700
Fuchs
31% matchPush the FBT-700's punchy, midrange-forward headroom with the Geezer Butler's own doom-voiced distortion and the low end stays thick, not muddy.
Comes later in the signal chain
Hartke LH1000 Bass Head
Hartke
31% matchPush the LH1000's punchy, warm preamp with the Geezer Butler's doom-voiced distortion and the low end stays defined.
Comes later in the signal chain
See all 95 amps that pair with the Ashdown Geezer Butler Signature →
Pedals that stack with the Ashdown Geezer Butler Signature
Artec RSV-3 Resovibe
Artec
28% matchAshdown Geezer Butler Signature leans toward high gain, and that's a real, usable character to pair with
Comes later in the signal chain
MXR Phase 90
MXR
26% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Run the Phase 90's classic sweep after the Geezer Butler's doom-voiced distortion and the modulation has serious low-end body to color.
Comes later in the signal chain
MXR Micro Amp
MXR
26% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)
Run MXR Micro Amp after it and the bright edge settles into something more warm
Comes earlier in the signal chain
ZVEX Fuzz Factory
Zvex
24% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → smooth)
Stack the Fuzz Factory into the Geezer Butler's doom-voiced drive for a glitchier, more unstable layer on top of the low-end grit.
Comes later in the signal chain
Ibanez CS Mini Compressor/Sustainer
Ibanez
23% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (warm → bright)
Ashdown Geezer Butler Signature's bright balances out the warm tone
Comes later in the signal chain
NuX Damp Reverb
Nux
21% matchAshdown Geezer Butler Signature leans toward high gain, and that's a real, usable character to pair with — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
JHS Lucky Cat Delay limited edition
JHS Pedals
21% matchAshdown Geezer Butler Signature leans toward high gain, and that's a real, usable character to pair with — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Wampler Faux Tape Echo
Wampler
21% matchAshdown Geezer Butler Signature leans toward high gain, and that's a real, usable character to pair with — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
See all 59 pedals that pair with the Ashdown Geezer Butler Signature →
Cheaper alternatives
Electro-Harmonix Nano Operation Overlord
Electro-Harmonix
51% similarityShared character: hard rock, treble, middle
Electro-Harmonix Battalion Bass Preamp/DI
Electro-Harmonix
49% similarityShared character: treble, middle, bass
Dunlop MXR M85 Bass Distortion
Dunlop
49% similarityShared character: high gain settings, presence, middle
Demon FX Microtubes A7K Bass Preamp
Demon Fx
49% similarityShared character: middle, bass, aggressive playing
Laney Digbeth Series Bass
Laney
46% similarityShared character: bass, stage, overdrive
Mesa/Boogie Subway Bass DI Preamp II
Mesa Boogie
40% similarityShared character: bass, studio, stage
Boutique & premium upgrades
Similar character
Ashdown MAS GZR-Pod
Ashdown
82% similarity“is a variant of the Geezer Butler Pedal of Doom, a professional-grade bass preamp and distortion pedal built with Black Sabbath bassist Geezer Butler.”
Ashdown John Myung Double Drive
Ashdown
51% similarityShared character: internal transformer, bass, distortion
Tech 21 Sansamp YYZ Shape-Shifter
Tech 21
50% similarityShared character: bass, distortion, aggressive playing
Hotone B Station
Hotone
46% similarityShared character: treble, middle, bass
Laney Black Country Customs Blackheath Bass Distortion
Laney
46% similarityShared character: hard rock, distortion
Ampeg SCR-DI
Ampeg
44% similarityShared character: bass, studio, full
See all alternatives to the Ashdown Geezer Butler Signature (cheaper + boutique) →
Questions people ask
What are good alternatives to the Ashdown Geezer Butler Signature?+
The closest matches in character are the Ashdown MAS GZR-Pod, the Ashdown John Myung Double Drive, the Tech 21 Sansamp YYZ Shape-Shifter. Budget picks: Electro-Harmonix Nano Operation Overlord, Electro-Harmonix Battalion Bass Preamp/DI, Dunlop MXR M85 Bass Distortion. Boutique upgrades: Orange Bass Butler Bi-Amp Bass Preamp.
What pairs well with the Ashdown Geezer Butler Signature?+
Strong matches from rig and tone-complementarity evidence: Swart Star-Base 1, Fuchs FBT 300, Laney RB3 Richter Bass Amp — Where this leans bright, Swart Star-Base 1 answers back warm.
How much does the Ashdown Geezer Butler Signature cost?+
Around $234.01 (live listing price, updated Oct 25, 2026).