JHS Fumble

Enter the Fumble.
The Fumble is a faithful production version of the other circuit I cloned for John: the Dumble BBC-1. Once the NOTADUMBLE V1 was discontinued, customers started telling us 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, 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 realized 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 your 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 you turn the knob 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

1. As a permanent buffer and clean boost at the front of your board. Set the output low, dial the input to taste. It tightens up everything downstream and gives you a sweetener you stop noticing because you never want to turn it off.

2. To slam the front of your overdrives. This is the secret most players miss. We 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 you've been hunting for but just didn't know it.

3. 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.

4. 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 you bought the NOTADUMBLE V1 and loved the clean section, this is what was actually inside it. If you missed it, this is a beautifully simple JFET clean boost with a control set you won't find anywhere else. If you've ever paid a lot of money for a Dumble style boost from another builder, you 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 you want the lead tone half of the Dumble equation, you will want the NOTADUMBLE V2 which updates the V1 with the 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 catalog, but the Moonshine took its place years ago. JHS 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.

Specifications

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