The Fumble exists because JHS Pedals made the biggest mistake in the company's history.

In May of 2025, JHS Pedals released the NOTADÜMBLË — their second solderless DIY kit pedal, containing two of the most coveted sounds from the Dumble universe. The overdrive side was correct: a boutique style overdrive built around the lead tone people associate with Larry Carlton, Eric Johnson, and Robben Ford. The clean side, however, was supposed to be a reverse engineered copy of the "A Box Later," a buffered effects loop device that Howard Dumble built sometime in the 1980s outside of his amplifier designs. John Mayer owns one of these obscure units and lent it to JHS. Josh replicated it, named it Box It Later, and that replica has travelled the world on John's pedalboards consistently since 2021. Josh thought he had put that circuit in the NOTADÜMBLË as the clean side.

He hadn't.

A week after launch, while planning a Short Circuit episode video about the NOTADÜMBLË, Josh discovered he had used the wrong circuit. The clean side of the NOTADÜMBLË wasn't the “A Box Later” – it was something else entirely. Something he had also reverse engineered back in 2019, again for John, and then completely forgotten about. A separate Dumble preamp box that lived in a different archive location in JHS's R&D storage. He had confused the two similar circuits and made a horrible mistake.

Josh made a video. He told everyone. JHS sold through the remaining inventory, discontinued the NOTADÜMBLË V1 after their batch of 15,000 sold out, and refunded anyone who asked to return their unit.

Enter the Fumble.

WHAT THE FUMBLE ACTUALLY IS

The Fumble is a faithful production version of the other circuit Josh cloned for John: the Dumble BBC-1. Once the NOTADÜMBLË V1 was discontinued, customers started telling JHS how much they loved that circuit and how they wished it was sold separately. The Fumble is that exact circuit, now in its own compact enclosure with its own self-deprecating name, an $89 price point, and no kit to build.

Here is where the story gets stranger than fiction. While digging back through the original Dumble unit's history, JHS realised the BBC-1 isn't really a Dumble circuit at all. It's a JFET preamp lifted almost part for part from a Barcus Berry acoustic preamp made in the 1970s — the kind of small utility box that bridged piezo pickups into electric guitar amps in an era when nobody had a modern acoustic preamp. Howard cloned it. Put it in his own enclosure for a handful of local LA players. He then used the same JFET stage inside his amplifiers and called it the FET mode.

Which means the legendary Dumble FET sound — the one inside $200,000 to $400,000 amps — is a clone of a 1970s piezo preamp.

The Fumble is a clone of that clone of that clone. Three generations deep into one of the strangest chains of events in pedal history.

WHAT IT DOES

The Fumble has two knobs, true bypass switching, and creates a particularly enhanced clean tone.

OUTPUT is the master volume. Turn it up for more volume.

INPUT is the one that surprises people. It is not a standard gain knob. It attenuates bass and input gain at the front of the circuit simultaneously. Fully right has no cut — consider it a bypass of the control. As the knob is turned to the left, bass and gain are gradually attenuated. Roll it down for a thinner, tighter response. Roll it up for a fuller, louder one. There is almost nothing else on the market that boosts in this way.

Use the Fumble four ways:

As a permanent buffer and clean boost at the front of a board. Set the output low, dial the input to taste. It tightens up everything downstream and gives players a sweetener they stop noticing because they never want to turn it off.
To slam the front of overdrives. Josh explained this is the secret most players miss. Players default to stacking gain after gain after gain. Putting a clean JFET boost like this before a Timmy, a King of Tone, a Klon, or a Morning Glory — that's often the better second stage players have been hunting for without realising it.
To slam the front of a dirty amp. Tweed, Plexi, anything broken up. The Fumble makes it bigger and more articulate. Roll the input back for a tighter, treble-forward attack into a cranked amp.
As a solo boost at the end of the chain. Crank the output, set the input where it feels best, hit it for the chorus or the solo. Done.

WHO THIS IS FOR

If players bought the NOTADÜMBLË V1 and loved the clean section, this is what was actually inside it.

If they missed it, this is a beautifully simple JFET clean boost with a control set they won't find anywhere else.

If players have ever paid a lot of money for a Dumble-style boost from another builder, JHS believes they should know the genuine article is simple. Uncomplicated. Affordable. It was always a version of an acoustic guitar preamp from the 70's.

WHO THIS ISN'T FOR

This is not an overdrive or a high gain pedal. If players want the lead tone half of the Dumble equation, they will want the NOTADÜMBLË V2, which updates the V1 with the proper Box It Later clean section and the overdrive channel – in a single solderless DIY kit with two footswitches, an order toggle, and an added effects loop.

THE NAME

JHS had the "Fumble" name and football helmet icon rolling around internally since April 10, 2012. It was originally going to be a Dumble-style overdrive in their catalogue, but the Moonshine took its place years ago. They never seriously revisited the Fumble project after then and the icon and rubber hand stamp went into a drawer for fourteen years. When all of this happened in 2025, the name was already there, waiting for the biggest fumble JHS had ever made as a company. Sometimes the universe hands you the punchline way in advance.

SPECS

True bypass JFET clean boost
Two controls: Input (bass and gain attenuator), Output (master volume)
9V DC centre negative, 5mA
Assembled in Kansas City

THIS PEDAL MEASURES 1.96" X 3.93" X 1.21" AND CONSUMES 5mA. DO NOT USE MORE THAN 9VDC CENTER NEGATIVE. DAMAGE MAY OCCUR AND YOUR WARRANTY WILL BE VOIDED.

Key Features:

• Faithful recreation of the Dumble BBC-1 JFET preamp circuit
• Based on the same FET stage used in legendary Dumble amplifiers
• Two-knob design with Input and Output controls
• Unique Input control simultaneously adjusts bass and input gain
• Functions as a clean boost, buffer, tone enhancer and gain stage
• True bypass switching preserves signal integrity when disengaged
• Ideal for pushing overdrives and driving dirty amplifiers harder
• Can be used as a front-end sweetener or end-of-chain solo boost
• Ultra-low 5mA current draw for pedalboard-friendly operation
• Compact enclosure assembled in Kansas City
  

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