Effectrode Mercury - Vacuum Tube Fuzz



The MERCURY fuzz pushes vacuum tube technology to its absolute limits for some devastatingly thick and rich 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 hot biased and cold-biased tube gain stages followed by a crystal diode asymmetric clipping circuit delivers a beautiful blend of thermionic and solid-state fuzzed guitar tone with unprecendented 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 MERCURY 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 transistors. Effectrode is now utilising these little tubes for peaceful purposes – to create extremely compact and tough little effects pedals!

Note: This is a limited edition pedal. Due to the limited availability of high quality N.O.S. tubes, we cannot guarantee continued production of this pedal for any amount of time.


  • Adrian Legg
  • David Gilmour – Pink Floyd
  • Andy Jackson


  • 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.

  • "HEAT" Switch: Allows the second tube stage to be operated at reduced plate voltage (starvation) to generate a wide range of "tubey" fuzz tones.

  • Crystal Diodes: A unique cascaded arrangement of vintage germanium crystal diodes gives the MERCURY more dynamic range and a rich, complex tone.

  • True Bypass: With Effectrode"s unique "anti-pop" or "thump" footswitching circuitry

  • Fitted with N.O.S Philips tube: Each MERCURY fuzz pedal is fitted with a N.O.S. Philips hand-selected 6112 subminiature tube. This is one of the finest tubes ever built by any manufacturer at any time in history.

  • Dakaware Knobs: Authentic phenolic Dakaware, Chicago 1510 knobs custom manufactured for Effectrode in the U.S.A using the original 1940s moulds.

  • 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.

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