The Mad Professor Simble Overdrive MK2 is a Mad Professor overdrive pedal, currently around $141.67. Close alternatives include the Keeley El Rey Dorado and the Universal Audio Lion. It pairs well with the Two-Rock Vintage Deluxe 6L6 35W 1x12 Combo and the Ceriatone Overtone Special.

Mad Professor Simble Overdrive MK2

Mad Professor · pedal

The Mad Professor Simble Overdrive Mk2 is the second-generation version of Mad Professor's flagship overdrive, an Alexander Dumble-inspired circuit that captures the warm, singing, harmonically complex breakup associated with Dumble's legendary custom amplifiers. The Simble is one of the most acclaimed affordable Dumble-inspired overdrives in the boutique market, and the Mk2 refinements address specific tonal and control criticisms of the original with circuit improvements and enhanced usability.

What stands out

  • “Players who want Dumble-inspired overdrive character”

    — from the community notes

  • “The Simble's warm, singing, harmonically complex character captures the essence of the Dumble overdrive tonal character”

    — from the community notes

  • “The Simble Overdrive Mk2 delivers outstanding Dumble-inspired warm, singing overdrive with harmonic complexity and touch sensitivity that rival much more expensive alternatives”

    — from the reviews

  • “The Simble is one of the most acclaimed affordable Dumble-inspired overdrives in the boutique market, and the Mk2 refinements address specific tonal and control criticisms of the original with circuit improvements and enhanced usability”

    — from the listing

  • “The Mk2 circuit improvements refine the original's already-excellent character”

    — from the reviews

Trade-offs

  • “mad professor quality is consistent”

    — from the community notes

  • overdrive
  • harmonically complex
  • warm
  • singing
  • breakup
  • dynamic
  • musical
  • lightly driven
Used$141.67View on Reverb

Price updated Oct 23, 2026

Genres the Mad Professor Simble Overdrive MK2 is commonly used in

Amps that pair well with the Mad Professor Simble Overdrive MK2

Two-Rock Vintage Deluxe 6L6 35W 1x12 Combo

Two-Rock

42% match
$5500via Reverb

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Two-Rock Vintage Deluxe 6L6 35W 1x12 Combo leans this dynamic tone toward compressed, which it doesn't make on its own

Comes later in the signal chain

Ceriatone Overtone Special

Ceriatone

41% match

Feed a edge of breakup signal into Ceriatone Overtone Special and it comes out closer to mid-forward

Comes later in the signal chain

Morgan MVP66

Morgan

tonal match

Comes later in the signal chain

Run Morgan MVP66 after it and the warm edge settles into something more bright

Vox AC30 Rose Morris 80s

amplifier

tonal match

Comes later in the signal chain

Where this leans warm, Vox AC30 Rose Morris 80s answers back bright

Díaz CD-100 Amp Head

Diaz

tonal match

Comes later in the signal chain

Where this leans warm, Díaz CD-100 Amp Head answers back bright

Vox Mini SuperBeetle Bass

Vox

tonal match

Comes later in the signal chain

Vox Mini SuperBeetle Bass leans bright right where the warm tone needs it

Orange OR30 Head

Orange

tonal match
$1799via Reverb

Comes later in the signal chain

Where this leans warm, Orange OR30 Head answers back bright

EBS Classic 450

Ebs

tonal match

Comes later in the signal chain

Stack EBS Classic 450 on top and a edge of breakup tone tightens toward mid-forward

Pedals that stack with the Mad Professor Simble Overdrive MK2

Dallas Rangemaster Treble Booster

Dallas

23% match

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

The Simble's warm, singing boutique breakup gives the Rangemaster's germanium treble boost a saturated signal to brighten up.

Comes earlier in the signal chain

MXR Distortion+

MXR

22% match
$155via Reverb

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

MXR Distortion+'s bright balances out the warm tone

Comes later in the signal chain

Dr. J D-55 Aerolite Compressor

Dr J

20% match
$49.99via Reverb

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Dr. J D-55 Aerolite Compressor's own compressed character is the real reason this is worth trying

Comes earlier in the signal chain

Walrus Audio Lillian

Walrus Audio

17% match
$219.95via 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.

Let the Lillian's subtle analog phasing trail the Simble's warm breakup for gentle movement on top of the drive.

Comes later in the signal chain

Catalinbread Epoch-Set

Catalinbread

12% match
$218.04via 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 Catalinbread Epoch-Set after Mad Professor Simble Overdrive MK2 in the signal chain, clear of Mad Professor Simble Overdrive MK2's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Dawner Prince Boonar

Dawner Prince

12% 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.

Behind the Simble's warm, singing overdrive, the Boonar's tube-driven repeats trail a harmonically complex signal instead of a bare one. — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Origin Effects M-EQ Driver

Origin Effects

tonal match
$311.71via Reverb

Origin Effects M-EQ Driver's bright balances out the warm tone

Electronic Audio Experiments Longsword V4.5

Electronic Audio Experiments

tonal match
$249via Reverb

Feed a edge of breakup signal into Electronic Audio Experiments Longsword V4.5 and it comes out closer to clean boost

Cheaper alternatives

Boss DS-1 Distortion (Japan, 1980s)

pedal

55% similarity
$62.99via Reverb

Shared character: singing, alternative, warm

T-Rex Fat Shuga

T Rex

52% similarity
$102.47via Reverb

Shared character: warm, overdrive

Pigtronix gamma drive

Pigtronix

49% similarity
$85via Reverb

Shared character: warm, overdrive

Lovepedal Purple Plexi

Lovepedal

47% similarity
$119.99via Reverb

Shared character: warm, overdrive

Fender Breakup Drive

Fender

46% similarity
$84.82via Reverb

Shared character: warm, overdrive

Source Audio Soundblox Multiwave Distortion

pedal

43% similarity
$101via Reverb

Shared character: overdrive

Boutique & premium upgrades

Menatone The Red Snapper mini

Menatone

68% similarity
$199via Reverb

Shared character: singing, warm, overdrive

Universal Audio Uafx Woodrow '55 Instrument Amplifier Preamp

Universal Audio

51% similarity
$422.18via Reverb

Shared character: warm

Free The Tone FM-1V Fire Mist Overdrive

Free The Tone

48% similarity
$300via Reverb

Shared character: alternative, warm, overdrive

Wampler Plexi-Drive Deluxe V2

Wampler

46% similarity
$199.99via Reverb

Shared character: warm

Revv Amplification G3 V2

Revv

42% similarity
$222.44via Reverb

Shared character: original, warm, overdrive

Free The Tone SS-1V String Slinger Overdrive

Free The Tone

42% similarity
$241.99via Reverb

Shared character: alternative, overdrive

Similar charactersee all similar tone character →

Keeley El Rey Dorado

Keeley

62% similarity

Shared character: singing, warm, overdrive

Universal Audio Lion

Universal Audio

54% similarity

Shared character: warm

Friedman Motor City Drive Overdrive

Friedman

50% similarity
$155via Reverb

Shared character: warm, overdrive

Joyo King of Kings Overdrive

Joyo

47% similarity

Shared character: warm, overdrive

EWS Eric Gales Brute Drive

Ews

46% similarity

Shared character: overdrive

J. Rockett Monkeyman

J Rockett

44% similarity

Shared character: warm, overdrive

See all alternatives to the Mad Professor Simble Overdrive MK2 (cheaper + boutique) →

Questions people ask

What are good alternatives to the Mad Professor Simble Overdrive MK2?+

The closest matches in character are the Keeley El Rey Dorado, the Universal Audio Lion, the Friedman Motor City Drive Overdrive. Budget picks: Boss DS-1 Distortion (Japan, 1980s), T-Rex Fat Shuga, Pigtronix gamma drive. Boutique upgrades: Menatone The Red Snapper mini, Universal Audio Uafx Woodrow '55 Instrument Amplifier Preamp, Free The Tone FM-1V Fire Mist Overdrive.

What pairs well with the Mad Professor Simble Overdrive MK2?+

Strong matches from rig and tone-complementarity evidence: Two-Rock Vintage Deluxe 6L6 35W 1x12 Combo, Ceriatone Overtone Special, Morgan MVP66 — Two-Rock Vintage Deluxe 6L6 35W 1x12 Combo leans this dynamic tone toward compressed, which it doesn't make on its own.

How much does the Mad Professor Simble Overdrive MK2 cost?+

Around $141.67 (live listing price, updated Oct 23, 2026).

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