The Mojo Hand FX DMBL is an overdrive inspired by the Dumble amplifier — the most expensive and mythologised production amplifier in guitar history, hand-built in small numbers by Howard Dumble from the 1970s onward. Original units have sold for over $100,000. The circuit is covered in black epoxy to prevent copying. The list of players who have owned one reads like a who’s who of rock guitar: Stevie Ray Vaughan, Carlos Santana, Eric Clapton, Jackson Browne.
What players love about Dumble amplifiers is a specific combination of qualities — rich harmonic content, a spongy low end, a growling midrange that responds directly to pick attack, and a sustain that feels elastic and alive. The DMBL attempts to capture those qualities in a pedal format. It’s not a high-gain circuit — it’s a lift, something that adds definition and harmonic richness without dramatically changing what’s already there.
Four customer reviews, all five stars. One customer specifically notes it stacks particularly well with other drives — use it as an always-on foundation or as a boost into another overdrive.
Controls
- Volume: Output level.
- Gain: Drive level from subtle enhancement to warm overdrive.
- Treble: High-frequency character.
- Tone toggle (two-position): Up for smooth bottom and flatter EQ. Down for more pronounced bite and midrange growl.
Key Features
- Dumble-inspired overdrive — harmonic richness and touch-responsive sustain
- Two-position Tone toggle — smooth/flat or bite/growl
- Not a high-gain pedal — a lift and enhancer
- Stacks well with other overdrives
- Works as always-on tone foundation
- True bypass
- 9V DC centre-negative or battery, 12mA
- Made in Holland, Michigan, USA
Power
9V DC centre-negative or battery at 12mA. Any outlet on the CIOKS DC7 v2 handles it comfortably.
Watch It In Action
A Dumble is a hand-built amplifier made in small numbers by Howard Dumble from the 1970s onward. They’re considered by many to produce the finest clean and lightly overdriven tone of any amplifier — rich harmonics, spongy low end, growling midrange, and elastic sustain. Original units have sold for over $100,000. Famous users include Stevie Ray Vaughan, Carlos Santana, Eric Clapton, and Jackson Browne.
No — the DMBL is a lift and enhancer rather than a high-gain distortion. It adds harmonic richness, warmth, and definition without dramatically changing your fundamental tone. Think of it as making everything sound slightly more alive and present.
Yes — customers specifically highlight this. Use it as an always-on foundation that everything else runs through, or as a boost into another overdrive for extra harmonic content and definition.
Two positions: up for a smooth, flat EQ character with more bottom end. Down for more pronounced bite and midrange growl. The down position is more aggressive and forward-sounding.
Yes — true bypass throughout.
9V DC centre-negative or a 9V battery at 12mA. Any outlet on the CIOKS DC7 v2 or CIOKS SOL handles it comfortably.
Lumin O (verified owner) –
Great
John G (verified owner) –
Very Happy!
Manc G (verified owner) –
Wow! Amazing!
Dave G (verified owner) –
Excellent low to medium gain overdrive.