Big Beefy Preamp - Boost and Overdrive

Sister circuit of the Acti-Boost (Type A and Type R), offering a lot more oomph for your signal .

Baxandall active EQ circuitry to keep your tone clean and crisp, offering +/- 15db on bass and treble, and 30dB boost, ranging from clean sparkle to full-on overdrive.

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

PCB is designed for vertical-mount pots (which have round shafts) which solder directly into the PCB, but you can wire up normal pots if you prefer.

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 50mm

Knobs required: 4

Enclosure: 1590B

Direct-Connect compatible (4-way)


Here's the older version


Pedal Parts



£31.20 inc. tax

£26.00 ex. tax
? Tax based on United Kingdom.

Customer Reviews

1 review(s) posted (write review)
Very flexible overdrive 5 product stars
"Exceeded my expectations. It's a very allround boost/overdrive which goes from just a little bit of spark all the way to creamy crunch heaven. Very nice to hear all settings in between are (more than) useable, expecially with the great EQ. Try it with Bass all the way up, very tube-like. One thing: I had to replace the Drive pot with an audio taper one (A1M). The linear pot jumped from zero to about 60% drive within the first 10% of a turn in my case." Alex - 20/10/2015

Recently Viewed

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