Updated Dec. 18, 2020

Spruce Effects The Arborist

California’s Spruce Effects has been very active in 2020 with a new series of pedals called “Americana Series,” but today they are unveiling a new pedal that doesn’t belong to that series but it’s, rather, an evolution of one of their older designs. To be precise, the Arborist is the silicon side of their now discontinued Giganteum Drive.

The three knobs control Volume, Tone and Gain and a toggle switch lets you add some Fat to the tone.

Check out the video of the Spruce Effects The Arborist below.

The Arborist was born as the silicon side of the former Giganteum Drive, offering excellent discrete transistor tones in the same package as our Germanium boost. We’ve repackaged the circuit in a familiar top-mount jack and slim enclosure for more pedalboard friendly use. The Arborist is a perfectly balanced medium gain drive pedal that is mostly happy pushing your tube amp into sweet overdrive or as a tone shaping tool in drive stacking. You can dial the gain all the way back and use the loads of gain on tap with the volume control to annihilate the front end of your amp. Dial the volume back and turn the gain control up to get that sweet, sweet transistor overdrive. The tone control is wired in classic Spruce Effects fashion, with thin and trebly CCW, and beefy and low-end heavy on the CW side. Use the fat toggle to add low-mids in to perfectly match your guitar and amp needs.

  • Switchcraft Jacks
  • True Bypass
  • Enclosure printed and drilled in the USA
  • Hand wired and assembled in California
  • Standard negative ground power


  • Top-mounted jacks, input on right, output on left
  • True-bypass stomp switch is on/off, indicated by LED
  • “Volume” controls the amount of output (a lot)
  • “Gain” controls the gain of the dual transistor stages for tube-amp like overdrive at reasonable volumes
  • “Tone” is a low-pass filter
  • The “fat” toggle switch adds low-mids back in for even more beef when you need it


We always recommend isolated power supplies. If you daisy chain effects on one supply or use a low-quality product, you may inject noise, ripple, ground loop hum, etc. This effect requires 9v, center negative power. In other words, the industry standard power supply.