Dumb Loop

A take on the Dumble A-Box-Later, recently made popular by the whole NotADumble debacle.

It's based on John Mayer's A Box Later, made by Mr Dumble. "An external effects loop that also acts as a line buffer/clean boost."

You can build it as a stand-alone boost if that's your thing, just like the JHS Fumble. Or go with what it was designed to be, and have it as a switched effects loop in your chain, with two knobs to tweak your loop input and output levels to perfection.

Supplied with board-mounted pots with round shafts, so you'll need set-screw fitting knobs).

If you want the PCB without parts there's a link for that at the bottom of the page.

Partial kit: PCB, all board-mounted components, pots.

Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.

Enclosure (pre-drilled) is only available with full kits, and won't take a battery . Knobs are not included.

Builds are only available with full kits including enclosures. Please choose appropriate knobs.

Inspired by: A Box Later / JHS Fumble

Difficulty: Easy

PCB size: 50 x 40mm

Knobs required: 2

Enclosure: 1590B

Direct Connect compatible (4 way)

Download the INSTRUCTION PDF