Acti-Boost - Type A and Type R

A nice pair of boosts/tone shapers, both of which can be made using the same PCB (though only one at a time - come on!).

Both versions utilise fantastic Baxandall active EQ circuitry to keep your tone clean and crisp, offering +/- 15db on bass and treble, and both kick out up to 20dB boost.

So, what's the difference?

  • Type A offers a bit of grit with your boost, pushing into overdrive at the top of the turn.
  • Type R is clean, clean, clean right up to the top end of the range, where a bit of dirt starts to creep in.

You can also opt for more bass-friendly caps, which change the frequency filtering at the input, and also adjusts the EQ control frequencies. These aren't bass effects, but can be used to great effect on your 4 (or 5)-string.

PCB is designed for vertical-mount pots, but you can use normal wired ones if you prefer. Note that the vertical mount pots supplied have round shafts, so will require knobs with set-screw fixing.

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 enclosure and vertical-mount pots. Please choose appropriate knobs.

Difficulty: Medium

PCB size: 50 x 50mm

Knobs required: 4

Enclosure: 1590B

Direct-Connect compatible (4-way)



Pedal Parts



£28.80 inc. tax

£24.00 ex. tax
? Tax based on United Kingdom.

Customer Reviews

5 review(s) posted (write review)
Great Booster 5 product stars
"The kit has everything you need in order to build a working booster and the enclosure was very well drilled. Good quality parts (i.e Matsushita and Wima capacitors, JRC4558D and fairly good balanced set of 2N5088). Even potentiometer dust covers were included! The assembly was rather easy and the instructions well documented. I completed it in less than an hour, but given my previous experience I believe that someone with basic soldering skills can do it in about 2 hours. Better check all your solderings, resistor values, diode direction etc before soldering the pots as then nearly is impossible to make changes without desoldering them. I believe that there should be a general population guidance and two actual pictures depending on the AC/RC choice in the manual to further assist beginners, but everything else is clearly stated! My preference was the clean version combined with the charge pumped daugherboard for bigger headroom. The results are more than satisfying!!! A great sounding booster with good tremble/ bass control to further push specific frequencies, gain adds a flavor. Will make your sound cut through without being ridiculously loud!" Dimitrios - 09/11/2017
Nice Pedal! 4 product stars
"Is my firts Fuzzdog kit. Resonable easy to assembly. N 1 diode wass missing in the kit but no problems to find it. Enclosure pre drilled is perfect! This kit (i buy Type A version) is really great sound if search slight to medium (at max) crunch sound. Is very sensityvy to intensity of picking. A very pleasant, balanced and round Grrrrrrrrrrr when you hit hard the strings. Remarkables tone controls. Very nice. Tk." Pesce Giampaolo - 04/10/2016
Acti-Boost R Review 5 product stars
"I built this kit because I was in need of a real good kick for my lead parts when playing live. Wow! I have to say this thing is amazing. It feels solid and it just sounds fantastic. My guitar really cuts through the mix and there is so much boost on tap! The gain delivers quite a punch if I need it to and the EQ is very responsive. This gave me everything I wanted and so much more!" Leigh - 05/05/2016
Perfect kit 5 product stars
"Perfect kit, well thought, well made. The parts are really good, the pcb is easy to solder on, the board mounted pots mare wiring so easy ! Sounds amazing, easy to build, went together like a dream. Can't say enough how happy I am with this boost. Keep in mind you will have to sort the resistors by hand, but the documentation on the website makes it easy and fast." Shirley - 30/08/2015
Cracking build 5 product stars
"My favourite build yet. The boost pushes my amp nicely and the active EQ gives a lovely top end sheen with some nice low end thump." Tom - 17/11/2014

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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