The Eureka! is a versatile silicon fuzz-distortion that combines singing, dynamic midrange with the weight, grit and sustain of classic Muff-style circuits. Its proprietary architecture stays responsive and distinctive across different guitars, effects and amplifiers, making it an unusually adaptable fuzz for both rhythm and lead work.

A three-position bass switch moves from a focused core voice to progressively heavier low end, helping match single coils, humbuckers and solo sounds. At the maximum bass setting, a strong input signal can push the circuit into a gated, spluttering response. From searing mid-rich leads to huge, snarling riffs, Eureka! keeps its own unmistakable voice.

Hybrid fuzz character
Silicon transistors are arranged to combine germanium-style dynamic midrange with full-bodied Muff-inspired fuzz-distortion.

Three bass settings
Middle position applies no bass boost; the first boost adds low-end weight; the maximum setting adds still more bass and can produce gated fuzz with a sufficiently strong input.

Controls
Level controls output, Tone shapes the frequency balance and Gain sets saturation.

• Bypass: true bypass
• Power: 9V battery or 9V DC, centre-negative
• Current draw: 8 mA
• Dimensions including jacks and controls: 11.1 x 7 x 4.8 cm / 4.3 x 2.7 x 1.8 in
• Weight: 230 g / 0.5 lb

Excellent condition. Very minor cosmetic blemishes on top of pedal shown in image. C/w original box and contents.