Mad Professor Little Green Wonder
A Finnish hand-wired overdrive based on Tube Screamer topology but with enhanced bass response, more neutral midrange, and greater headroom. Features a distinctive Body control that shapes the character of the effect.
- 9V DC · center −
- 4 mA
- Analog
- New
- from $370
- Used (asking)
- from $80
The rundown
Highlights
- Hand-wired construction from Mad Professor
- Tube Screamer-style circuit with fuller bass and less midrange emphasis
- Body control provides tonal shaping options
- Runs on 9V DC battery or standard power supply
- Compact enclosure at 66.5 x 114.3 mm
Best for
Players seeking a versatile overdrive that can function as either a standalone effect or a boost, with more tonal flexibility than traditional Tube Screamer designs.
Professional reviews
What the press rated it. We link to each review; read the full piece for the details.
- Guitar World4.5 / 5Jun 2026Read the review
Quick facts
- Power
- 9V DC
- Current draw
- 4 mA
- Polarity
- Center negative
- Dimensions
- 66.5 × 114.3 mm
- Status
- In production
Where to buy Mad Professor Little Green Wonder
$370 lowest new price · Reverb
Used listings asking $80–$155, median $119 (5 listings). Asking prices, not sold prices.
| Seller | Condition | Price | Link |
|---|---|---|---|
| Reverb | Used | $80 | View |
| Reverb | Used | $113.99 | View |
| Reverb | Used | $119 | View |
| Reverb | Used | $155 | View |
| Reverb | Used | $241.33 | View |
| Reverb | New | $370 | View |
Prices last checked 22 hours ago. Links to sellers are affiliate links.
Frequently asked questions
What power does the Little Green Wonder require?
The Little Green Wonder runs on a 9V DC center-negative supply and draws 4 mA.
Can the Little Green Wonder run on batteries?
Yes, the Little Green Wonder is battery-compatible and can run on a 9V battery.
Similar pedals
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