Three Knob

Like two knobs, but with one more


Check the products below to see what colors and circuit options are in stock! Disclaimer: We do not claim or own any of the brands, names, or any copyrighted references on this page.  Any copyrighted names are the sole property of their respective owners. 


Etched Series: Muff

The Big Muff. No introduction needed. We've studied vintage schematics and streamlined the build process for incredible, vintage-accurate tones in a cost-effective package. We are currently offering three famous variants of the circuit tuned to our taste. 

  • Top mount Switchcraft jacks
  • Controls from left to right: sustain, tone, volume
  • Etched Spruce Effects logo and high quality machined aluminum knobs 
  • High quality wima capacitors in the audio path
  • Standard negative-ground power
  • High-quality isolated and filtered, power supply required! Must use a normal, 2.1mm Boss style 9v adapter

$159.00

  • 1 lb
  • Sold Out

Etched Series: Percolator Fuzz

One of the weirder fuzzes of the 1970s, there does not seem to be a consensus on original schematics as there are multiple versions of the pedal floating around with not a lot of verifiable history. The Harmonic Percolator is definitely one of the more unique fuzzy drives we've played and we really like our version. We have a small stash of the original 2n404 transistors and will transition to a different device when we run out. We've added an input depth control to dial in the EQ voicing of the fuzz and you can select between a couple of different diode options via a toggle. 

  • Top mount Switchcraft jacks
  • Controls from left to right: balance, harmonics, input depth (tone--super useful to dial in your guitar's pickup type)
  • Etched Spruce Effects logo and high quality machined aluminum knobs 
  • NOS Germanium 2n404 transistor
  • High quality wima capacitors in the audio path
  • Standard negative-ground power
  • High-quality isolated and filtered, power supply required! Must use a normal, 2.1mm Boss style 9v adapter

$179.00

  • 1 lb
  • Sold Out

Etched Series: Astrotone Fuzz

The Sam Ash Astrotone is a unique, two silicon transistor fuzz/distortion circuit from the 1960's music retailer, Sam Ash. It was one of the first Silicon fuzz boxes and had a mostly useless tone control that we have improved and modernized. It's a nice, full sounding fuzz that can work as a distortion in various settings. The controls are Level, Tone, and Attack. Attack works more like the volume control on your guitar than a traditional fuzz control! 

  • Top mount Switchcraft jacks
  • Controls from left to right: input depth, harmonics, balance
  • Etched Spruce Effects logo and high quality machined aluminum knobs 
  • High quality wima capacitors in the audio path
  • Standard negative-ground power
  • High-quality isolated and filtered, power supply required! Must use a normal, 2.1mm Boss style 9v adapter

$159.00

  • 1 lb
  • Sold Out

Etched Series: Octavia

The Tycobrahe Octavia is stuff of legend. With originals commanding $1,000+, it's no secret that well-made clones are popular. We took the original circuit, matched the tone, and added an octave on/off toggle and a pregain control to give way more flexibility!

  • Top mount Switchcraft jacks
  • Controls from left to right: volume, pregain, boost
  • Toggle removes or adds octave effect
  • Etched Spruce Effects logo and high quality machined aluminum knobs 
  • High quality wima capacitors in the audio path
  • Standard negative-ground power
  • High-quality isolated and filtered, power supply required! Must use a normal, 2.1mm Boss style 9v adapter

$179.00

  • 1 lb
  • Sold Out

Etched Series: ToneBender mkIII

The Tone Bender is a classic 3 transistor Germanium fuzz (with a couple of exceptions) that literally changed rock and roll. The MKIII is one of the "newest" variants of the circuits, including a tone control and is a bit smoother than the classic "sizzle" of the earlier version. We modernized the circuit a bit (same mods as our old "Salt Water Fuzz" and think our version is absolutely massive. We utilize a variety of transistors, but all are hand-selected, matched NOS devices. 

  • Top mount Switchcraft jacks
  • Controls from left to right: input depth, harmonics, balance
  • Etched Spruce Effects logo and high quality machined aluminum knobs 
  • NOS Germanium transistors
  • High quality wima capacitors in the audio path
  • Standard negative-ground power
  • High-quality isolated and filtered, power supply required! Must use a normal, 2.1mm Boss style 9v adapter

$189.00

  • 1 lb
  • Sold Out