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TWA Krytical Mass KM-01


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TWA Krytical Mass KM-01 Reactive Octave Fuzz


  • Fuzz circuit inspired by vintage Maestro Bass Brassmaster
  • Pronounced upper octave harmonic AND subtle lower harmonic
  • Filter-like sweeps on long notes
  • Super tight muting without a noise gate!
  • Selectable HPLP, and BP filters with adjustable midrange
  • Bias Voltage adjustment
  • Edge control
  • Transformer polarity switch


Based on the coveted Maestro Bass Brassmaster, Krytical Mass® was born from exhaustive critical analysis into the inner workings of that Holy Grail device and the few noble attempts that have been made to clone it.

Krytical Mass® spits out fat, formidable fuzz with a pronounced octave up as well as a more subtle octave down and a scorching, filter-like sweep on sustained notes. Muted notes will “kill” the fuzz with almost gate-like precision, yielding a super-tight, synth-like pulse that is simply addictive to play.

Where other replicas tend to be harsh and sterile sounding, Krytical Mass® is able to capture the aggressive yet warm & organic edge of the original Brassmaster using a unique complement of EQ and voltage manipulation controls.

One of the great mysteries of the Brassmaster is its unmarked transformer and how it was wound. Analysis suggests that this component may have actually been wired with negative polarity, so Krytical Mass® includes a switch to toggle between positive & negative phase wirings for additional tonal options.

Another unique feature of Krytical Mass® is the ability to adjust the bias voltage of the transistors to taste, accentuating either 2nd order harmonics for more lows or higher-order harmonics for more complex waveform content.

Also on board are selectable High Pass, Low Pass, and Band Pass filters with adjustable midrange to fine-tune Krytical Mass® to your particular tonal tastes.

Set off your own nuclear chain reaction with Krytical Mass®only from Totally Wycked Audio®!