The Mad Professor Simble Predriver is a Mad Professor overdrive pedal, currently around $229. Close alternatives include the Mad Professor Mad-Sdo and the Xotic EP-Pro. It pairs well with the Two-Rock Silver Sterling Signature 100/50W and the Ceriatone Overtone Special.
Mad Professor Simble Predriver
Mad Professor · pedal
The Mad Professor Simble Predriver is a PCB version of a precursor or companion to the Simble Overdrive, providing Dumble-inspired preamp and drive character in a more accessible PCB construction format. Mad Professor's Simble platform encompasses the Simble Overdrive and related Dumble-inspired designs aimed at capturing the warmth and harmonic complexity of Alexander Dumble's legendary custom amplifiers.
What stands out
“Mad Professor's Simble platform encompasses the Simble Overdrive and related Dumble-inspired designs aimed at capturing the warmth and harmonic complexity of Alexander Dumble's legendary custom amplifiers”
— from the listing
“The Simble Predriver PCB delivers Dumble-inspired preamp and drive character in Mad Professor's PCB construction format”
— from the reviews
“Part of Mad Professor's Dumble-inspired Simble platform, available in PCB construction for greater accessibility than the hand-wired version”
— from the community notes
“The Mad Professor Simble Predriver is a PCB version of a precursor or companion to the Simble Overdrive, providing Dumble-inspired preamp and drive character in a more accessible PCB construction format”
— from the listing
“Mad Professor construction quality is consistent in both formats”
— from the reviews
- pcb
- overdrive
- warmth
- harmonic
- musical
- mad professor
- pcb construction
Price updated Oct 23, 2026
Amps that pair well with the Mad Professor Simble Predriver
Two-Rock Silver Sterling Signature 100/50W
Two-Rock
32% matchTwo-Rock Silver Sterling Signature 100/50W leans toward high headroom, and that's a real, usable character to pair with
Comes later in the signal chain
Ceriatone Overtone Special
Ceriatone
30% matchCeriatone Overtone Special's own transparent character is the real reason this is worth trying
Comes later in the signal chain
Laney Richter
Laney
tonal matchComes later in the signal chain
Laney Richter's bright balances out the warm tone
Mesa Boogie Subway D-350
Mesa Boogie
tonal matchComes later in the signal chain
Mesa Boogie Subway D-350 leans bright right where the warm tone needs it
PRS DG
PRS
tonal matchComes later in the signal chain
PRS DG leans bright right where the warm tone needs it
Vox MV50 Brian May
Vox
tonal matchComes later in the signal chain
Where this leans warm, Vox MV50 Brian May answers back bright
Fuchs ODH
Fuchs
tonal matchComes later in the signal chain
Run Fuchs ODH after it and the warm edge settles into something more bright
Soldano SLO-30 2-Channel 30W 1x12 Combo
Soldano
tonal matchComes later in the signal chain
Where this leans warm, Soldano SLO-30 2-Channel 30W 1x12 Combo answers back bright
Pedals that stack with the Mad Professor Simble Predriver
Tech 21 SansAmp
Tech 21
24% 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)
Where this leans warm, Tech 21 SansAmp answers back bright
Comes later in the signal chain
EarthQuaker Devices Chelsea
EarthQuaker Devices
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)
EarthQuaker Devices Chelsea's bright balances out the warm tone
Comes later in the signal chain
JHS 3 Series Compressor
JHS Pedals
19% 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)
What JHS 3 Series Compressor brings here leans toward compressed — that's worth building a pairing around
Comes earlier in the signal chain
IdiotBox Effects End of Line
Idiotbox Effects
18% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep IdiotBox Effects End of Line after Mad Professor Simble Predriver in the signal chain, clear of Mad Professor Simble Predriver's own gain stage
Comes later in the signal chain
Strymon El Capistan
Strymon
12% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep Strymon El Capistan after Mad Professor Simble Predriver in the signal chain, clear of Mad Professor Simble Predriver's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Chase Bliss Automatone CXM 1978
Chase Bliss Audio
12% 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 Chase Bliss Automatone CXM 1978 after Mad Professor Simble Predriver in the signal chain, clear of Mad Professor Simble Predriver's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Alchemy Audio HBE Detox EQ
Alchemy Audio
tonal matchComes later in the signal chain
Where this leans warm, Alchemy Audio HBE Detox EQ answers back bright
CALIFORNIA WUB Continuum EQ Galaxy Man Edition
California Wub
tonal matchComes later in the signal chain
Where this leans warm, CALIFORNIA WUB Continuum EQ Galaxy Man Edition answers back bright
Cheaper alternatives
67Audio Harry Balz
67audio
44% similarityShared character: overdrive
Blackstar Dept. 10 Boost
Blackstar
44% similaritySimilar role and voicing
Xotic EP Booster
Xotic
43% similarityShared character: warm
Maxon OD808
Maxon
42% similarityShared character: warm, overdrive
Benson Amps Portable Distortion 424 MKII
Benson Amps
80% similaritysimilar tone character
Boutique & premium upgrades
Chase Bliss Automatone Preamp MKII
Chase Bliss Audio
51% similarityShared character: overdrive
Analog Man King of Tone
Analog Man
45% similarityShared character: overdrive
Browne Amplification Carbon
Browne Amplification
43% similarityShared character: warm, overdrive
Friedman IR-D
Friedman
43% similarityShared character: overdrive
Similar character
Mad Professor Mad-Sdo
Mad Professor
55% similaritySimilar voicing: warm, harmonically rich
Xotic EP-Pro
Xotic
48% similarityShared character: warm
Vox CT-03BT
Vox
47% similarityShared character: overdrive
JHS Overdrive/Preamp
JHS Pedals
45% similarityShared character: warm, overdrive
Benson Amps Germanium Preamp (Boost)
Benson Amps
45% similaritySimilar role and voicing
Colorsound Power Boost
Colorsound
45% similarityShared character: warm, overdrive
See all alternatives to the Mad Professor Simble Predriver (cheaper + boutique) →
Questions people ask
What are good alternatives to the Mad Professor Simble Predriver?+
The closest matches in character are the Mad Professor Mad-Sdo, the Xotic EP-Pro, the Vox CT-03BT. Budget picks: 67Audio Harry Balz, Blackstar Dept. 10 Boost, Xotic EP Booster. Boutique upgrades: Chase Bliss Automatone Preamp MKII, Analog Man King of Tone, Browne Amplification Carbon.
What pairs well with the Mad Professor Simble Predriver?+
Strong matches from rig and tone-complementarity evidence: Two-Rock Silver Sterling Signature 100/50W, Ceriatone Overtone Special, Laney Richter — Two-Rock Silver Sterling Signature 100/50W leans toward high headroom, and that's a real, usable character to pair with.
How much does the Mad Professor Simble Predriver cost?+
Around $229 (live listing price, updated Oct 23, 2026).