JPTR FX WARLOW mini

The JPTR FX WARLOW mini is a fuzz pedal from German builder JPTR FX, and it is the company's classic Warlow circuit moved into a smaller enclosure. JPTR FX calls it "a premium-quality OP Amp 'Big Muff' pedal that has been painstakingly rebuilt to deliver an even bigger, wider sound" with more gain and volume, and says it captures the raw, wild sound of the Seattle music scene¹.

The circuit has a specific lineage. JPTR FX says the pedal was rebuilt using a vintage "Big Muff" from the same release date as the Siamese Dream album, which points at the op-amp era of the Electro-Harmonix Big Muff Pi rather than the earlier transistor versions¹. What separates it from a straight copy is the tone shaping: its filter section combines both classic and "Proco Rat" filters, a mix JPTR FX describes as unique¹.

A Big Muff-based fuzz in a smaller enclosure

The original Warlow earned its reputation on size as much as sound. When Delicious Audio added it to the site's guide to Big Muff-style fuzzes in June 2023, the write-up noted that "the Warlow comes in an appropriately large enclosure for its equally huge tones"³. That is the problem the mini solves: the same circuit family in a box that fits a crowded pedalboard.

The Big Muff connection is not marketing shorthand. Pedal of the Day's review of the Warlow Fuzz Monstrosity described it as "a premium-quality OP Amp Big Muff pedal that has been painstakingly rebuilt to deliver an even bigger, wider" sound, with more gain and volume than the circuit it draws on². For context, the Big Muff family spans several categories at Electro-Harmonix: the Little Big Muff Pi is listed as a "Fuzz / Distortion / Sustainer"⁴, and the op-amp design the Warlow builds on is one branch of that family tree.

The mini keeps the features that define the line:

• An op-amp "Big Muff" circuit rebuilt for more gain and volume than the original design¹
• A filter section combining classic and "Proco Rat" filters¹
• A vintage "Big Muff" from the Siamese Dream release-date era as the reference unit¹

How it differs from the other Warlows

JPTR FX has built the Warlow out in several directions, and the mini sits alongside them as the compact standard version¹.

The classic Warlow page carries the same £129.00 price with taxes included as the mini, so the choice between them comes down to enclosure size rather than cost⁵. The limited versions are a different story: the TRVE WARLOW LIMITED 50 was a handmade blackened-finish edition capped at 50 units and is now sold out, and the Deluxe Warlow folds the octave-up circuit from JPTR FX's Katastrophe pedal into an upgraded Warlow, limited to 100 units⁶⁷.

Buying one: batches, taxes and shipping

JPTR FX does not sell through retailers in the usual way. The order page states the model plainly¹⁵⁸:

That means a WARLOW mini is built to order rather than pulled from stock, and the wait time depends on where the batch cycle stands. The listed price of £129.00 has taxes included, and JPTR FX ships via DDP (UPS/DHL) with zero additional customs duties or hidden fees⁵⁹. For a US player ordering from the German builder, that DDP shipping means the customs side is handled up front rather than on delivery.

What reviewers said

Published coverage of the Warlow line has placed it squarely in the Big Muff tradition. Pedal of the Day's review of the Warlow Fuzz Monstrosity called it "a premium-quality OP Amp Big Muff pedal that has been painstakingly rebuilt to deliver an even bigger, wider" sound, with more gain and volume². That framing matches how JPTR FX itself describes the pedal, so a player comparing it against other Big Muff-style fuzzes is looking at a circuit whose lineage both the maker and the press name openly².

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