Blue Fool - MXR Blue Box+

Hot! Blue Fool - MXR Blue Box+

Note: now Direct Connect. The main image just needs updating

Bit of a strange one, this. A fuzz box with a blendable 2-octave down note. Quite a glitchy affair (if you want clean octave-down you'd better head into digital land), but pretty damn good. Great for fattening up riffs and solo notes.

The original maxes out at around unity gain, so FuzzDog Labs have included a post-boost to make it more useable and generally lovely. You can also flick between one or two octaves down which makes this a lot more versatile, though you can hardwire it for either and ditch the switch if you prefer.

Octave selection switch is board-mounted for minimal wiring and easy enclosure mounting.

Famously used on Led Zeppelin's Fool in the Rain (hence the name of the kit).

Those funky friends of FuzzDog, LongFallBoots, have a demo vid right here

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 will not take a battery. Knobs are not included.

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

Difficulty: Medium

PCB size: 50 x 45mm

Knobs required: 2

Enclosure: 1590B

Direct Connect compatible (4-way)



Pedal Parts



£30.00 inc. tax

£25.00 ex. tax
? Tax based on United Kingdom.

Customer Reviews

2 review(s) posted (write review)
Great Blue Box Plus (get the 1/2 oct switch, well worth the extra buck) 4 product stars
"Love this thing. My first build. Took about 8 hours, but I had to refresh my memory on 4 and 5 banded resistor reading. And the soldering takes a steady hand. But, now that I know what to LOOk for, the next one should take HALF that time. Oh, and mine was dead when I first finished it. I thought long and hard "What else could it be?" and I finally figured it out: it was the two chips! I found out by pressing one in a little more. Evidently, u have to b VERY careful install these chips. The legs are fragile, the sockets and legs don't line up out of the box.... so many things to go wrong. DO THE CHIP SOCKETS FIRST, PUT THE ACTUAL CHIPS IN LAST! Oh, and also: I LOVE THE WAY THIS SOUNDS! So many hours of fun. Can't wait to get home from practice tonight (as a drummer) and plug my Arturia MiniBrute into this. This thing seems BUILT for synths!!!! LOVE LOVE LOVE IT!!!!" damnedcat777 - 15/03/2017
Fun, crazy, octave fuzz 5 product stars
"The third element in my fuzz trilogy. All right, I have my BMP for my standard fuzz sound, my Axis Fuzz for the solos... is there anything fuzzy I need? Absolutely, the Blue Fool. While very specific to use in the context of a song, being able to blend the two signals and to boost the signal along with the craziness of the fuzz itself, there are plenty of interesting textures that can be obtained out of this little blue box. Being able to switch between one octave and two octaves down is brilliant, by the way. Have recorded a couple of songs with it and I couldn't be more satisfied with the special sound I get out of it, can go from subtle octave to really crazy while keeping its place in the mix. One of those pedals I don't usually stomp on but would run to build again if someone stole mine." NiLace - 18/02/2017

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Full kits DO NOT include enclosures unless you select them in the 'Kit Type' drop-down menu.

Don't forget to download the appropriate daughterboard build document for your kit:
Standard 3PDT