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Effectrode is the last word in Tone! - Guitar effects pedals crafted using handselected
miniature or N.O.S. subminiature vacuum tubes and finest audio-grade components.

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Helios Tube Fuzz

Helios Vacuum Tube FuzzThe HELIOS fuzz pushes vacuum tube technology to its absolute limits for some devastatingly thick and warm fuzz sounds that are not attainable with traditional transistor fuzzes. This beautiful little pedal is built on a vintage, hand selected space grade pencil tube and N.O.S. germanium point-contact crystal diodes – there’s a lot of glass in this pedal! This combination of tube gain stages followed by a crystal diode asymmetric clipping circuit delivers an incredibly warm and rich fuzzed guitar tone whilst preserving clarity and string-to-string definition. At full throttle this little pedal can generate outrageous ‘blocking-distortion’ which sounds like a tube amp being pushed beyond it’s limits. Rolling back the ‘Fuzz’ control creates an immense, bold fuzz tone with endless amounts of smooth liquid sustain that stretches notes into infinity. At lower fuzz settings the Helios cleans up to produce some beautiful and natural sounding (real!) tube dirt and overdrive. It’s an incredibly simple, yet versatile pedal.

Subminiature (or pencil) tubes were developed during World War II for missile control and therefore had to be exceptionally tough devices. These tubes were manufactured to meet the stringent MIL-E-1 specification for reliability and designed for long service life under conditions of severe shock, vibration (20,000G!), high temperature and high altitude. The subminiature tubes represent the pinnacle of tube technology and offer more consistent musical performance than the early NOS germanium transistors. Effectrode is now utilising these little tubes for peaceful purposes – to create extremely compact and tough little effects pedals! This is a limited production run of only 200 of this unique little pedal.


  • Adrian Legg
  • David Gilmour – Pink Floyd


  • All-Tube: 100% pure analogue vacuum tube audio path operating at amp plate voltages.
  • Fuzz Flexbility: Stacks of fuzz sounds from devastating over-the-top tube amp ‘blocking distortion’, to classic 70s Page and Clapton fuzz – the fuzz cleans-up very nicely when the guitar volume knob is rolled back to produce warm, tubey drive tones.
  • ‘Fire’ Switch: Allows the second tube stage to be operated at reduced plate voltage (starvation) to generate a wide range of coarser, ‘spluttery’ fuzz tones.
  • Crystal Diodes: A unique cascaded arrangement of crystal diodes gives the HELIOS more dynamic range and a rich, complex tone.
  • True Bypass: With Effectrode’s unique ‘anti-pop’ or ‘thump’ footswitching circuitry
  • Fitted with NOS gilded grid tube: The gold content is 5.4 mg in grids of both triodes. Military quality, “OTK” and military rhombus signed on the body – manufactured by MELZ plant (Moscow city, Soviet Union).
  • Includes 12V Wall-wart Power Supply: High quality low-noise switched mode 12VDC at 1.5A wall-wart compatible with all our pedals. Accepts 100V to 240VAC mains input and comes with different mains outlet adaptor plugs, so there is always a plug that fits the country that you are playing in.
  • Limited Edition Pedal: Only 200 made.

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