Oh Deebee!

Hey bass buds - here's one for you. OK, guitar guys also welcome.

Massive growling dirt box based on the OCD. However, forget about sonic similarties, as 'based on' is quite loose.

The up-front grunt is indeed OCD topology, but here we have it on a +/-9V supply for extra headroom and volume. The original uses a different charge pump to supply +/-18V from an 18V supply, but that's overkill, honestly. A three-way CUT control lets you select the bottom end cut off to suit your needs. Two way clipping gives you two distinct flavours of dirt.

After that it goes off-piste. A James tone stack tuned for bass makes tweaking the tone a pleasure. You also have a mids-boost pot to play with, making this a very versatile box.

Supplied with Lumberg jacks if you go for top-mount so they'll fit nicely above the pots.

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

Partial kit: PCBs, all board-mounted components (not footswitches), 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 available as an option with full kits, and will not take a battery. Knobs are not included.

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

Inspired by: Olde Dirty Bass

Difficulty: Medium

PCB size: 80 x 38mm

Knobs required: 5

Enclosure: 1590BB

Download the INSTRUCTION PDF