Expresso FX Fuzz Bender Mk I.V "Mini"

The Expresso FX Fuzz Bender Mk I.V "Mini" is a germanium fuzz pedal and a compact version of the full-size Fuzz Bender Mk I.V. Expresso FX describes it as a mini version of that pedal "with exactly the same components and same classic tone," squeezed into a smaller enclosure for players who need board space¹.

The circuit it replicates is the dual-transistor Tone Bender, often referred to as the Tone Bender Mk1.5, one of the classic British fuzz designs of the 1960s. The full-size Fuzz Bender Mk I.V is an accurate replica of that circuit, and the Mini carries the same build². For a player, that means the pedal sits in the same family as the other Mk1.5-style benders on the market, distinguished here by its mini enclosure and its menu of NOS germanium transistor pairs.

Transistor options and components

The Mini is built with hand-selected NOS germanium transistors, and Expresso FX offers a choice of pairs. Because germanium transistors from the 1960s vary widely from unit to unit, the choice of pair is one of the main decisions a buyer makes with this pedal, and Expresso FX describes each option in its own words³¹:

"Cleanup" here refers to how the fuzz responds when the guitar's volume is rolled back: a pair with good cleanup lets a player thin the effect out from the instrument rather than reaching for the pedal. The OC75 and OC76 pairing sits at the other end of the spectrum, with a raw and cutting tone¹.

Around the transistors, the component list is vintage throughout:

• NOS Allen Bradley carbon composition resistors³
• NOS Mullard C296 "Mustard" polyester capacitor³
• Philips/BC electrolytic capacitors²
• Bourns trimpots³
• Alpha 16mm potentiometer³
• Switchcraft jacks³
• Alpha footswitch³
• Premium 22 AWG solid core silver-plated copper wire with Teflon insulation³
• Lead-free, silver-based solder³

The wiring itself is point-to-point construction, with no circuit board. Expresso FX frames this as part of the pedal's vintage character: the components are soldered directly to one another and to the controls, the way the original 1960s units were built, rather than mounted on a PCB¹. The Bourns trimpots are the internal bias adjustments a builder uses to set up the germanium transistors, which need individual setup because their gain and leakage vary from unit to unit.

Build and finishes

Expresso FX calls the Mini "a very vintage-inspired pedal with a selection to top-drawer NOS components and point-to-point construction" despite its smaller size¹. The circuit sits in a Hammond aluminum enclosure, powder-coated, measuring 92.5 x 38.5 x 31 mm. At that size it takes up roughly the footprint of a common mini pedal, small enough to tuck into a tight pedalboard row where the full-size Mk I.V would not fit.

The pedal is offered in four finishes³:

• Antique Copper Hammertone
• Blue Hammertone
• Gray Hammertone
• Translucent Copper

The DC socket is wired for standard center-negative polarity power, matching the convention of most modern pedal power supplies¹. Like the full-size Mk I.V, the Mini is true bypass, so it leaves the dry signal alone when switched off¹. It carries a 3-year warranty¹.

How it relates to other Expresso FX fuzzes

The Mini shares its circuit with the Fuzz Bender Mk I.V, whose manual describes the same hand-selected NOS germanium transistor approach and Philips/BC electrolytic capacitors². The difference between the two is physical rather than electrical: same components, same tone, smaller box¹.

Expresso FX also builds the Fuzz Bender MkII, a recreation of the earliest three-transistor circuit from the Bender family, and a range of other germanium and silicon fuzzes including the Germanium Fuzz, the Silicon Fuzz and the Buzzabout. A player comparing benders within the maker's own range is choosing between the Mk1.5-style dual-transistor circuit of the Mk I.V and Mini, and the earlier three-transistor MkII circuit, with the Mini as the board-space-saving option among them²¹⁴.

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