The Mad Professor Mad-Rbo is a Mad Professor distortion pedal, currently around $188.58. Close alternatives include the Dean Markley Overlord and the Paul Cochrane Timmy. It pairs well with the Dumble Steel String Singer and the Orange Matamp.
Mad Professor Mad-Rbo
Mad Professor · pedal
The Mad Professor Royal Blue Overdrive covers a wide range from light overdrive into full distortion, with Volume, Distortion, Treble, and Bass controls. At its lowest Distortion setting the pedal behaves almost like an EQ stage, adding minimal filtering for a transparent boost. Turning the Distortion knob up moves it into a crunchy, tube-amp-like breakup and eventually into heavier gain. Both Treble and Bass are boost/cut shelving controls, giving broad tonal shaping rather than a single fixed voicing. It is built to go from subtle amp-like grit to genuine distortion within one pedal, and forms the basis of Mad Professor's Supreme A-side circuit.
- distortion
- treble
- boost
- transparent
- breakup
- bass
- exact signature tone
- gain
Price updated Aug 27, 2026
Genres the Mad Professor Mad-Rbo is commonly used in
- Classic Rock
- Blues
- Rock
- Alternative
cited
Inferred from shared tonal signals, not a stated genre tag. - Indie Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Metal
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Mad Professor Mad-Rbo
Dumble Steel String Singer
Dumble
28% matchDumble Steel String Singer leans smooth right where the bright tone needs it
Orange Matamp
Orange
26% matchRun Orange Matamp after it and the bright edge settles into something more smooth
Fender Prosonic
amplifier
tonal matchWhere this leans bright, Fender Prosonic answers back warm
Gibson GA-50
Gibson
tonal matchGibson GA-50's warm balances out the bright tone
Ampeg V-4
Ampeg
tonal matchRun Ampeg V-4 after it and the bright edge settles into something more warm
Ampeg V4-B Head
Ampeg
tonal matchRun Ampeg V4-B Head after it and the bright edge settles into something more smooth
Orange BT1000H Terror Bass 1000-Watt Bass Amp
Orange
tonal matchOrange BT1000H Terror Bass 1000-Watt Bass Amp's warm balances out the bright tone
Orange Terror Bass
Orange
tonal matchRun Orange Terror Bass after it and the bright edge settles into something more warm
Pedals that stack with the Mad Professor Mad-Rbo
Electro-Harmonix Green Russian Big Muff
Electro-Harmonix
21% matchRun Electro-Harmonix Green Russian Big Muff after it and the bright edge settles into something more smooth
Catalinbread SFT
Catalinbread
20% matchWhere this leans bright, Catalinbread SFT answers back warm
Behringer Chorus Symphony
Behringer
19% matchRun Behringer Chorus Symphony after Mad Professor Mad-Rbo in the signal chain, clear of Mad Professor Mad-Rbo's own gain stage
Rocktron Big Crush Compressor
Rocktron
18% matchRocktron Big Crush Compressor's own smooth character is the real reason this is worth trying
Line 6 DL4 Delay Modeler
pedal
12% matchKeep Mad Professor Mad-Rbo's bright voice out front: Line 6 DL4 Delay Modeler goes after Mad Professor Mad-Rbo 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)
Caroline Guitar Company Kilobyte
Caroline Guitar Company
12% matchCaroline Guitar Company Kilobyte's pristine voice goes after Mad Professor Mad-Rbo in the signal chain — it's not there to compete with Mad Professor Mad-Rbo's own bright character — goes in the amp's FX loop (or last, into a clean amp)
Tone City King of Blues
Tone City
tonal matchInto Mad Professor Mad-Rbo, Tone City King of Blues is right at home: it's built around a clean amp's front end
Suhr Eclipse
Suhr
tonal matchInto Mad Professor Mad-Rbo, Suhr Eclipse is right at home: it's built around a clean amp's front end
Cheaper alternatives
Dunlop MXR Timmy Overdrive, sold as Dunlop CSP027
Dunlop
74% similarityShared character: grit, treble, subtle
Electro-Harmonix Spruce Goose
Electro-Harmonix
74% similarityShared character: pedal, grit, full
DOD Carcosa
Dod
72% similarityShared character: extreme_settings, pedal, wide_range
Boss SD-1 Super OverDrive
Boss
72% similarityShared character: pedal, grit, wide_range
Demon FX Full BB Preamp
Demon Fx
70% similarityShared character: volume, full, boost
Demon FX Gladiator
Demon Fx
67% similarityShared character: volume, treble, simple
Boutique & premium upgrades
JHS Colour Box V2
JHS Pedals
72% similarityShared character: pedal, full, treble
Electronic Audio Experiments Surveyor Instrument Voicing Preamp
Electronic Audio Experiments
70% similarityShared character: grit, treble, pedal
Electronic Audio Experiments Longsword V4.5
Electronic Audio Experiments
68% similarityShared character: pedal, boost, treble
Death By Audio Thee Treble
Death By Audio
95% similaritysimilar tone character
Similar charactersee all similar tone character →
Dean Markley Overlord
Dean Markley
73% similarityShared character: pedal, full, treble
Paul Cochrane Timmy
Paul Cochrane
73% similarityShared character: treble, simple, transparent
Bogner Ecstasy Blue Mini Overdrive
Bogner
72% similarityShared character: pedal, wide_range, boost
MXR M104 Distortion+
MXR
71% similarityShared character: pedal, grit, wide_range
Keeley KO-Als Distortion
Keeley
68% similarityShared character: treble, pedal, distortion
Fender Full Moon
Fender
65% similarityShared character: extreme_settings, full, treble
See all alternatives to the Mad Professor Mad-Rbo (cheaper + boutique) →
Questions people ask
What are good alternatives to the Mad Professor Mad-Rbo?+
The closest matches in character are the Dean Markley Overlord, the Paul Cochrane Timmy, the Bogner Ecstasy Blue Mini Overdrive. Budget picks: Dunlop MXR Timmy Overdrive, sold as Dunlop CSP027, Electro-Harmonix Spruce Goose, DOD Carcosa. Boutique upgrades: JHS Colour Box V2, Electronic Audio Experiments Surveyor Instrument Voicing Preamp, Electronic Audio Experiments Longsword V4.5.
What pairs well with the Mad Professor Mad-Rbo?+
Strong matches from rig and tone-complementarity evidence: Dumble Steel String Singer, Orange Matamp, Fender Prosonic — Dumble Steel String Singer leans smooth right where the bright tone needs it.
How much does the Mad Professor Mad-Rbo cost?+
Around $188.58 (live listing price, updated Aug 27, 2026).