The Keeley KO-Als Distortion is a Keeley distortion pedal, currently around $170. Close alternatives include the Mad Professor Mad-Rbo and the Cusack Music Orthrus Distortion. It pairs well with the Marshall Silver Jubilee 25/55 100W Amp Head and the Friedman Dirty Shirley.

Keeley KO-Als Distortion

Keeley · pedal

The Keeley KO-ALS is a limited-edition distortion pedal, hand-built in a run of just 100 units, based on the Keeley Stahlhammer circuit, with proceeds from its sale benefiting Project ALS in support of ALS (Lou Gehrig's Disease) research. It offers Distortion, Level, Bass, Mids, and Treble controls for finely shaping heavy distortion tones, plus a side-mounted switch selecting between Fender- and Marshall-style EQ contours, letting players tailor the pedal's underlying amp-voicing character.

What stands out

  • “It offers Distortion, Level, Bass, Mids, and Treble controls for finely shaping heavy distortion tones, plus a side-mounted switch selecting between Fender- and Marshall-style EQ contours, letting players tailor the pedal's underlying amp-v…”

    — from the listing

  • “Primary use case is players wanting high-gain distortion with genuine EQ precision”

    — from the community notes

  • “The Keeley KO-ALS is a limited-edition distortion pedal, hand-built in a run of just 100 units, based on the Keeley Stahlhammer circuit, with proceeds from its sale benefiting Project ALS in support of ALS (Lou Gehrig's Disease) research”

    — from the listing

  • “Based on the Stahlhammer circuit, a well-regarded Keeley high-gain design, giving it genuine tonal pedigree”

    — from the reviews

  • “Full Bass/Mids/Treble EQ section offers real precision for shaping heavy distortion, more control than many single-knob distortion pedals provide”

    — from the reviews

Trade-offs

  • “s fundamental amp-character reference point”

    — from the community notes

  • “and as a rare charitable release supporting als research with a strictly”

    — from the community notes

  • distortion
  • high gain
  • treble
  • mids
  • bass
  • eq
  • full

Price updated Oct 24, 2026

Genres the Keeley KO-Als Distortion is commonly used in

  • Electronic
  • Metal
    citedInferred from shared tonal signals, not a stated genre tag.
  • Hard Rock
    citedInferred from shared tonal signals, not a stated genre tag.
  • Alternative
    citedInferred from shared tonal signals, not a stated genre tag.
  • Rock
    citedInferred from shared tonal signals, not a stated genre tag.
  • Punk
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Keeley KO-Als Distortion

Marshall Silver Jubilee 25/55 100W Amp Head

amplifier

27% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)

Marshall Silver Jubilee 25/55 100W Amp Head's warm balances out the bright tone

Comes later in the signal chain

Friedman Dirty Shirley

Friedman

26% match

gain stackingStacks two gain stages for more saturation than either produces alone. (mid-forward → high gain)

Run mid-forward into Friedman Dirty Shirley for more high gain on top

Comes later in the signal chain

Fender Dual Showman

amplifier

tonal match
$1100via Reverb

Comes later in the signal chain

Fender Dual Showman pushes a high gain tone toward tight

Orange Little Bass Thing

Orange

tonal match
$681.58via Reverb

Comes later in the signal chain

Where this leans bright, Orange Little Bass Thing answers back warm

Mesa Boogie Mark VII 1x12 Combo

Mesa Boogie

tonal match

Comes later in the signal chain

Put Mesa Boogie Mark VII 1x12 Combo in front and the mid-forward tone leans further toward high gain

Mesa Boogie Mark VII Rackmount Head

Mesa Boogie

tonal match
$3199via Reverb

Comes later in the signal chain

Mesa Boogie Mark VII Rackmount Head stacks high gain on top of the mid-forward already here

Mesa Boogie Mark Five:25 Head

Mesa Boogie

tonal match
$3849via Reverb

Comes later in the signal chain

Put Mesa Boogie Mark Five:25 Head in front and the mid-forward tone leans further toward high gain

Revv Generator 120 MkIII 10th Anniversary 4-Channel 120W Head

Revv

tonal match

Comes later in the signal chain

Stack Revv Generator 120 MkIII 10th Anniversary 4-Channel 120W Head on top and a high gain tone tightens toward tight

Pedals that stack with the Keeley KO-Als Distortion

Boss CE-2W Chorus Waza Craft

Boss

15% match
$219.99via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep Keeley KO-Als Distortion's high gain voice out front: Boss CE-2W Chorus Waza Craft goes after Keeley KO-Als Distortion in the signal chain so its modulated voice doesn't muddy it

Comes later in the signal chain

Fjord Fuzz Fjaer Spring Reverb

Fjord Fuzz

14% match
$249via Reverb

gain stackingStacks two gain stages for more saturation than either produces alone. (mid-forward → fuzzy)

Fjord Fuzz Fjaer Spring Reverb stacks fuzzy on top of the mid-forward already here

Comes later in the signal chain

Greer Black Mountain

Greer

12% match
$199via Reverb

gain stackingStacks two gain stages for more saturation than either produces alone. (mid-forward → fuzzy)

Greer Black Mountain layers fuzzy onto an already mid-forward signal

Suhr Discovery

Suhr

12% match
$581.02via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep Keeley KO-Als Distortion's high gain voice out front: Suhr Discovery goes after Keeley KO-Als Distortion in the signal chain so its warm voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

J. Rockett Clockwork Echo

J Rockett

11% match

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → modulated)

Keep J. Rockett Clockwork Echo after Keeley KO-Als Distortion in the signal chain, clear of Keeley KO-Als Distortion's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Pigtronix Gloamer Volume Swell

Pigtronix

11% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → smooth)

Pigtronix Gloamer Volume Swell's own smooth character is the real reason this is worth trying

Comes earlier in the signal chain

Anarchy Audio Flutterby Tremolo

Anarchy Audio

tonal match

Comes later in the signal chain

Anarchy Audio Flutterby Tremolo goes after Keeley KO-Als Distortion — modulation sits after the gain for a defined swirl

Matthews Effects The Pocket Drive Overdrive Boost

Matthews Effects

tonal match
$105via Reverb

Comes earlier in the signal chain

Matthews Effects The Pocket Drive Overdrive Boost pushes a high gain tone toward clean boost

Cheaper alternatives

Boutique & premium upgrades

Similar charactersee all similar tone character →

See all alternatives to the Keeley KO-Als Distortion (cheaper + boutique) →

Questions people ask

What are good alternatives to the Keeley KO-Als Distortion?+

The closest matches in character are the Mad Professor Mad-Rbo, the Cusack Music Orthrus Distortion, the Friedman Small Box Overdrive. Budget picks: Caline CP-15, DigiTech Metal Master, MXR Super Badass Distortion. Boutique upgrades: Electronic Audio Experiments Longsword Eastside Exclusive Mono Camo, Fuzzrocious Baxtabber, Xotic EP-Pro.

What pairs well with the Keeley KO-Als Distortion?+

Strong matches from rig and tone-complementarity evidence: Marshall Silver Jubilee 25/55 100W Amp Head, Friedman Dirty Shirley, Fender Dual Showman — Marshall Silver Jubilee 25/55 100W Amp Head's warm balances out the bright tone.

How much does the Keeley KO-Als Distortion cost?+

Around $170 (live listing price, updated Oct 24, 2026).

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