The Mad Professor - Little Green Wonder HW is a Mad Professor overdrive pedal, currently around $370. Close alternatives include the Fulltone OCD V2 and the Joyo R-02 Taichi R-Series. It pairs well with the Mesa Boogie Mark I and the Laney RB3 Richter Bass Amp.
Mad Professor - Little Green Wonder HW
Mad Professor · pedal
The Mad Professor Little Green Wonder HW is the hand-wired version of the acclaimed Mad Professor Little Green Wonder transparent overdrive from Finnish boutique manufacturer Mad Professor, delivering transparent, touch-sensitive low-to-mid gain overdrive with an organic, amp-like breakup character in a hand-wired boutique format. The LGW is considered one of the finest transparent overdrive designs, valued for its ability to enhance guitar tone without heavy coloration.
What stands out
“The Mad Professor , touch-sensitive overdrive at Finnish boutique hand-wired quality for blues and classic rock players who want the finest transparent overdrive from a respected European boutique …”
— from the community notes
“Strengths: Transparent, touch-sensitive overdrive delivers while enhancing dynamics and breakup at Mad Professor Finnish hand-wired quality”
— from the reviews
“Organic, amp-like breakup character”
— from the reviews
“Its standout weakness is the hand-wired boutique pricing”
— from the community notes
“The Mad Professor , delivering transparent, touch-sensitive low-to-mid…”
— from the listing
Trade-offs
“hand-wired boutique pricing above the standard pcb version”
— from the reviews
- transparent
- overdrive
- touch
- amp like
- breakup
- organic
- boutique
- drive
Price updated Oct 23, 2026
Genres the Mad Professor - Little Green Wonder HW is commonly used in
- Classic Rock
- Country
- Blues
- Indie Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Alternative
cited
Inferred from shared tonal signals, not a stated genre tag. - Americana
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Mad Professor - Little Green Wonder HW
Mesa Boogie Mark I
Mesa Boogie
21% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (transparent → mid-forward)
Into a transparent tone, Mesa Boogie Mark I brings a pull toward mid-forward that's missing
Comes later in the signal chain
Laney RB3 Richter Bass Amp
Laney
20% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (transparent → mid-forward)
Into a transparent tone, Laney RB3 Richter Bass Amp brings a pull toward mid-forward that's missing
Comes later in the signal chain
ENGL Special Edition E670
Engl
tonal matchComes later in the signal chain
Into a transparent tone, ENGL Special Edition E670 brings a pull toward high gain that's missing
Ceriatone JTM45 MkII
Ceriatone
tonal matchComes later in the signal chain
Into a transparent tone, Ceriatone JTM45 MkII brings a pull toward low gain that's missing
ENGL E610II Savage 120 MkII Head
Engl
tonal matchComes later in the signal chain
ENGL E610II Savage 120 MkII Head leans this transparent tone toward mid-forward, which it doesn't make on its own
Egnater Tweaker 88 Head
Egnater
tonal matchComes later in the signal chain
Into a transparent tone, Egnater Tweaker 88 Head brings a pull toward low gain that's missing
Friedman Small Box 50W EL34 Amp Head
Friedman
tonal matchComes later in the signal chain
Into a transparent tone, Friedman Small Box 50W EL34 Amp Head brings a pull toward high gain that's missing
Engl 120 E610 MK II
Engl
tonal matchComes later in the signal chain
Engl 120 E610 MK II leans this transparent tone toward mid-forward, which it doesn't make on its own
Pedals that stack with the Mad Professor - Little Green Wonder HW
Klon KTR
Klon
20% matchInto a transparent tone, Klon KTR brings a pull toward medium gain that's missing
EarthQuaker Devices '- Speaker Cranker
EarthQuaker Devices
19% matchInto a transparent tone, EarthQuaker Devices '- Speaker Cranker brings a pull toward low gain that's missing
TC Electronic Mimiq Doubler
TC Electronic
17% 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 TC Electronic Mimiq Doubler after Mad Professor - Little Green Wonder HW in the signal chain, clear of Mad Professor - Little Green Wonder HW's own gain stage
Comes later in the signal chain
Wampler Mini Ego 76 Compressor
Wampler
16% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
What Wampler Mini Ego 76 Compressor brings here leans toward compressed — that's worth building a pairing around
Comes earlier in the signal chain
Fender Hammertone Reverb
Fender
7% 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 Mad Professor - Little Green Wonder HW's transparent voice out front: Fender Hammertone Reverb goes after Mad Professor - Little Green Wonder HW in the signal chain so its lush voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
JHS 3 Series Oil Can Delay
JHS Pedals
7% 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 Mad Professor - Little Green Wonder HW's transparent voice out front: JHS 3 Series Oil Can Delay goes after Mad Professor - Little Green Wonder HW in the signal chain so its modulated voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Cry Baby Dunlop Cry Baby 535Q Multi-Wah
Cry Baby
tonal matchComes earlier in the signal chain
Put Cry Baby Dunlop Cry Baby 535Q Multi-Wah in front of Mad Professor - Little Green Wonder HW: a wah tracks picking dynamics best on the raw signal
Dophix Dante
Dophix
tonal matchDophix Dante leans this dynamic tone toward compressed, which it doesn't make on its own
Cheaper alternatives
Walrus Audio Voyager
Walrus Audio
59% similarityShared character: touch, transparent, overdrive
Vertex Steel String Slight Return
Vertex
57% similarityShared character: touch, transparent, overdrive
Lovepedal Believe
Lovepedal
54% similarityShared character: touch, classic rock, overdrive
Friedman Golden Pearl Overdrive
Friedman
53% similarityShared character: touch, transparent, classic rock
Warm Guitar Pedals WA-CVS
Warm Guitar Pedals
53% similarityShared character: transparent, overdrive
Origin Effects Deluxe55 Tweed Recreation
Origin Effects
51% similarityShared character: touch, classic rock, overdrive
Similar charactersee all similar tone character →
Fulltone OCD V2
Fulltone
65% similarityShared character: touch, transparent, classic rock
Joyo R-02 Taichi R-Series
Joyo
62% similarityShared character: touch, transparent, overdrive
Kalavera FX Valient Overdrive
Kalavera Fx
61% similarityShared character: touch, transparent, classic rock
NuX Masamune
Nux
59% similarityShared character: touch, transparent, overdrive
JHS Morning Glory
JHS Pedals
56% similarityShared character: transparent, overdrive
TC Electronic MojoMojo Overdrive
TC Electronic
56% similarityShared character: touch, transparent, overdrive
See all alternatives to the Mad Professor - Little Green Wonder HW (cheaper + boutique) →
Questions people ask
What are good alternatives to the Mad Professor - Little Green Wonder HW?+
The closest matches in character are the Fulltone OCD V2, the Joyo R-02 Taichi R-Series, the Kalavera FX Valient Overdrive. Budget picks: Walrus Audio Voyager, Vertex Steel String Slight Return, Lovepedal Believe.
What pairs well with the Mad Professor - Little Green Wonder HW?+
Strong matches from rig and tone-complementarity evidence: Mesa Boogie Mark I, Laney RB3 Richter Bass Amp, ENGL Special Edition E670 — Into a transparent tone, Mesa Boogie Mark I brings a pull toward mid-forward that's missing.
How much does the Mad Professor - Little Green Wonder HW cost?+
Around $370 (live listing price, updated Oct 23, 2026).