Electro Harmonix Q-Tron Plus + Filter Pedal

£169.99

Also available on — Andertons, Amazon, eBay & Reverb

Fresh on the menu for 2026 are the Electro Harmonix Guitar Pedals, freshly added and carefully selected. These New units are available to order online with fast, secure delivery from trusted UK retailers. Read on for full details, specifications, demos, videos, reviews, and the best places to buy the Electro Harmonix Guitar Pedals today.


Description

Fresh on the menu for 2026 are the Electro Harmonix Guitar Pedals, freshly added and carefully selected. These New units are available to order online with fast, secure delivery from trusted UK retailers. Read on for full details, specifications, demos, videos, reviews, and the best places to buy the Electro Harmonix Guitar Pedals today.

The ultimate envelope follower Same as the original Q-Tron but with added Effects Loop and Attack Response Switch. Used by many iconic guitaists such as John Mayer, the Qtron Plus is making a real comeback! The Effects Loop lets you place an additional effect between the Q-Tron+’s preamp and filter section without changing the envelope drive. The added Response Switch lets the player choose between a slow, smooth, vowel-like attack and the fast, snaked response of the original Q-Tron.

What Electro Harmonix say about the Q-Tron Plus:

Same design as the original Q-Tron but with extremely useful Effects Loop and an Attack Response Switch.

The Effects Loop gives the musician the ability to place an additional effect, or chain of effects between the Q-Tron Plus’s preamp and filter section without changing the envelope drive. This is particularly important with most distortion devices, as most all do not have much of an amplitude envelope. The FX loop will also fire up your creative juices to try all sorts of combinations in the effects loop: try the Micro POG into a Deluxe Memory Man. You can invent all sorts of novel effects.

The added Response Switch selects between a slow, smooth, vowel-like attack and the fast, snaked response of the original Q-Tron.

Key Features:

  • True bypass
  • Dedicated effects loop allows you to place any effect or pedal board into the loop
  • FX send and return without changing the envelope drive
  • Selectable low pass, band pass and high pass filters
  • Resonant peak control to adjust the filter’s Q from subtle to dramatic
  • Response switch changes the reaction time of envelope follower from fast to slow
  • Switchable hi or lo frequency sweep ranges
  • Adjustable gain knob and boost switch
  • Sweep direction switch for up or down filter sweeps
  • Tough and compact die-cast chassis
  • 24DC-100 power supply included

Additional information

Weight 0.5 kg

Brand

Electro Harmonix

Electro-Harmonix (EHX) is a legendary manufacturer of guitar pedals and audio electronics, renowned for their distinctive sound and pioneering designs. Established in 1968 by Mike Matthews, EHX has played a significant role in shaping the landscape of effects pedals. The company’s pedals are celebrated for their innovative circuits and unique tones, earning them a dedicated following among musicians across genres. From classics like the Big Muff Pi fuzz to modern favorites like the POG octave generator, Electro-Harmonix pedals are known for their versatility and sonic character.

EHX’s product lineup spans a wide range of effects categories, including distortion, modulation, delay, and reverb, among others. Their pedals often feature intuitive controls and rugged construction, making them suitable for both stage and studio use. In addition to their iconic standalone pedals, Electro-Harmonix has also produced notable units such as the Memory Man delay/echo and the Holy Grail reverb, which have become staples in many guitarist’s rigs. With a legacy of innovation and a commitment to quality, Electro-Harmonix continues to be a leading force in the world of guitar effects, inspiring musicians to explore new sonic possibilities.

Category

Guitar Pedals

Tags

Boost

A boost pedal does one simple thing brilliantly — it makes your signal louder, stronger, and more alive. Whether you’re pushing a valve amp into natural breakup, lifting a solo above the band, or adding a touch more presence to your core tone, a clean boost gives you extra headroom without changing your character.

Use it at the front of your chain to drive other pedals harder, or after your gain stages to raise volume without adding distortion. Subtle or powerful, transparent or slightly coloured, a boost is one of the most useful tools on any pedalboard — small box, big difference.

Distortion

Distortion pedals take your clean guitar signal and transform it into something bigger, bolder, and full of attitude. By clipping the waveform, they add sustain, bite, and aggression, creating that thick, compressed tone that’s powered rock music for decades. From the growling crunch of classic hard rock to the tight, saturated roar of modern metal, distortion is all about energy and presence. It gives every note weight and authority, pushing your amp to its limits and beyond.

There are countless flavours of distortion, each with its own texture and edge. Some sound smooth and creamy, others raw and gnarly like tearing fabric. It’s the sonic equivalent of turning up the heat until the sound cooks — rich, sizzling, and perfectly seasoned to taste. Whether used for rhythm muscle or soaring leads, a good distortion pedal doesn’t just add volume; it adds personality, grit, and that unmistakable sense of power under your fingers.

envelope filter

An envelope filter reacts to your playing dynamics, opening and closing its sweep based on how hard you pick. Dig in and it quacks, ease off and it softens — delivering that unmistakable funk snap, auto-wah bounce, and touch-sensitive groove that feels alive under your fingers. It’s expressive, rhythmic, and full of character.

Use it to bring movement to clean riffs, add vocal-like sweeps to bass lines, or inject serious funk into your rhythm playing. From subtle shimmer to full-on 70s squelch, an envelope filter turns your picking hand into the control knob.

Filter

A filter pedal shapes your tone by emphasising or cutting specific frequencies, letting you sculpt everything from subtle tonal shifts to bold, sweeping textures. Unlike traditional wah or envelope effects, filters can be static or controlled in different ways, giving you focused control over how bright, dark, sharp, or resonant your sound becomes.

Use a filter to tighten the low end, tame harsh highs, or create synth-like sweeps and rhythmic movement. Whether you’re refining your core tone or pushing into experimental territory, a filter pedal gives you precise control over the flavour of your sound.

New

This is brand new, fresh in, and a UK warranty is included. New Gear always comes from trusted UK music retailers.

Preamp

A preamp pedal shapes and boosts your guitar’s signal before it reaches your amp or recording interface, giving you control over tone, gain, and headroom. It acts as the first stage of amplification, adding warmth, clarity, and character while preparing your signal for the next part of the chain. Some preamps emulate the response of classic valve circuits, while others offer clean, transparent tone shaping ideal for acoustic instruments or direct recording setups.

Used on its own, a preamp pedal can serve as the foundation of your tone, providing a consistent core sound wherever you play. When combined with other effects, it enhances dynamics and helps each pedal sound more defined and natural. Whether you’re looking to push your amp harder, bring life to a dull signal, or refine your sound for the studio, a good preamp pedal adds presence, punch, and musicality to any rig.

used

Used pedals bring character, value, and often a bit of history to your board. Whether it’s a well-loved classic or a recent release looking for its next home, a used pedal offers the same core tone at a more accessible price. Fully tested and described clearly, it’s a chance to grab great gear without paying brand-new money.

Go used to explore different sounds, track down discontinued favourites, or build your setup more affordably. Sometimes a pedal with a few marks on the casing still delivers flawless tone — and might even have a story or two behind it.