Electro-Harmonix Q-Tron Plus

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$165.00 to $192.30 Price Tier: Standard

4.5 (32)

5 Reviews

Find out who is using Electro-Harmonix Q-Tron Plus

11 community setups

47 wishlisted

123 saved

Page last updated Jun 12, 2026

Pricing and availability

We compare 600+ stores and found this item at 9 stores. Prices updated June 12, 2026.

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Reviews

Price

4.5 (10)

$192.30

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4.0 (7)

$192.30

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4.0 (49)

$192.30

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5.0 (50)

$167.26 46 available New

$80.00 18 available Used

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4.0 (10)

$192.30

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$192.30

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4.5 (61)

$166.00 $165.00 $1.00 · All time low

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£170.00

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5.0 (2)

$192.30

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Average Price: $174

Standard/Professional

$70

$251+

Price Tier

In the Filter Effects Pedals category, Electro-Harmonix Q-Tron Plus is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

Budget

Standard

High-end

Price History

Based on price data from 7 merchants for "Electro-Harmonix Q-Tron Plus". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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The Electro-Harmonix Q-Tron Plus is the modern incarnation of the classic envelope follower, bringing back the distinctive sounds of the 70s with a contemporary twist. This pedal is not just your typical envelope follower; it comes equipped with an effects loop and an Attack Response switch, which allows you to customize your sound like never before.

The effects loop gives you the freedom to insert additional effects between the Q-Tron+'s preamp and filter section without altering the envelope drive, opening up a world of creative possibilities. Whether you're looking to add distortion, flange, or any other effect, the Q-Tron+ has got you covered.

The Attack Response switch adds another layer of customization, letting you choose between a fast, biting response reminiscent of the original Q-Tron or a slower, smoother attack for a more laid-back vibe. The Q-Tron+ is all about giving you control over your sound, so you can create those funky, filtered tones that you've been dreaming of.

Key Features:

Effects loop for adding additional effects
Attack Response switch for controlling the attack speed
True bypass for maintaining signal integrity
Selectable low pass, band pass, and high pass filters
Resonant peak control for adjusting the filter's Q
Switchable hi or lo frequency sweep ranges
Adjustable gain knob and boost switch
Sweep direction switch for up or down filter sweeps
Power adapter included

Owner's manual

Electro-Harmonix Q-Tron Plus User Manual

Product specs

Pedal Type	Envelope Controlled Filter
Analog/Digital	Analog
Inputs	1 x 1/4" (instrument), 1 x 1/4" (fx return)
Outputs	1 x 1/4" (main out), 1 x 1/4" (fx send)
True Bypass	Yes
Bypass Switching	Switchable to Effect Mode Bypass
Power Source	24V DC power suppy (included)
Height	2.4"
Width	6"
Depth	4.7"
Weight	1.25 lbs.

FAQs

What makes the Electro-Harmonix Q-Tron Plus different from other envelope filter pedals?: The Electro-Harmonix Q-Tron Plus features an FX loop for integrating additional effects and a switchable effect mode bypass, offering versatile tonal shaping options and improved signal clarity.
Can the Q-Tron Plus be powered with a standard 9V power supply?: No, the Q-Tron Plus requires a 24V DC power supply, which is included with the pedal, to ensure optimal performance.
Is the Electro-Harmonix Q-Tron Plus suitable for bass guitar?: Yes, the Q-Tron Plus works well with bass guitars, providing dynamic envelope filtering that enhances the instrument's natural tone without losing low-end clarity.
Does the Electro-Harmonix Q-Tron Plus have true bypass?: Yes, the Q-Tron Plus features true bypass switching, ensuring your signal remains uncolored when the pedal is not in use.
What are the main connectivity options for the Q-Tron Plus?: The Q-Tron Plus offers 1/4" inputs for instruments and FX return, as well as 1/4" outputs for main out and FX send, allowing flexible routing options in your pedalboard setup.

Videos

Add video

EHX

Electro-Harmonix Q-Tron Plus Envelope Filter with Effects Loop (EHX Pedal Demo by Dave Weiner)

EHX

That Pedal Show – Introduction To Auto Wah & Envelope Filters

That Pedal Show

Electro-Harmonix Q-Tron Plus Envelope Filter With Effects Loop (Demo by Dan Miller)

EHX

Electro Harmonix - Qtron Plus (Strat)

Anıl Yazar

Electro-Harmonix Q-TRON PLUS In-Depth Review [Bass]

Vitaly Ganya

Electro-Harmonix Q-Tron+ Envelope Controlled Filter Demo

Pedal of the Day

Electro-Harmonix Q-Tron Plus Envelope Filter Complete Demo/Test Pedal | John Mayer Guitar Pedals 🎸

Alberto Martinez Del Rio Guitar

The Q-Tron Plus by Electro-Harmonix - The Shakedown Sound Series

PJ and the Beard

qtron plus demo from Electro Harmonix

The Guitar Generation

UNBOXING The EHX Q-Tron+ Envelope & Auto-Wah Pedal

Rudy G. Rock Artist

Reviews

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PROS

Versatile, works well with guitar and synth
Built-in boost enhances tone without the need for extra pedals
Unique sound customization through LP/BP/HP modes
Excellent for achieving specific artist tones like Jerry Garcia
Responsive touch dynamics for expressive play
Features like FX send/return add tonal flexibility
Mix mode offers unique blending of signals
Compact size compared to previous models
Sturdy construction withstands regular use
Peak knob allows precise tone shaping

CONS

Requires 24V power supply, incompatible with most power bricks
Volume boost may require external management
Can color tone too much when used with other pedals
Loud popping noise when switching on/off in some units
May saturate or have weak output over time
Placement on pedalboard crucial for optimal performance
Lack of external control input limits experimentation

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Electro-Harmonix Q-Tron Plus.

Mods and upgrades

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Owners recommend the r32 “Jerry” mod and a master volume mod for the Q-Tron Plus to enhance its tonal capabilities.
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The Iron Ether Xerograph Deluxe is reported to have a slow/fast switch, providing an alternative for users seeking similar functionality to the Q-Tron Plus's response time settings.
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Features and functionality

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The older big box Q-Tron Plus includes an effects loop, allowing integration with additional effects like phasers or dirt pedals.
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The power demand can be challenging; a dc7 with a 24v outlet and center positive cable is required, along with a link adapter for proper powering.
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The "response time" switch on the Q-Tron Plus allows users to choose between "slow" and "fast" modes, a feature not found in many similar pedals.
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Comparisons

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Users often compare the Q-Tron Plus with the Mu Tron III and Mu Tron Microtron IV, noting that the latter can better achieve a Jerry Garcia tone.
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The Source Audio Spectrum is noted for having a response time/speed parameter, although it may lack the up/down sweep feature seen in the Q-Tron Plus.
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The Maxon AF9 is praised for being smoother and achieving about 95% of the Q-Tron Plus's functionality, with a smaller form factor and standard power supply compatibility.
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User experience

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One owner adapted their big box Q-Tron with a mix knob mod from Analogman to control the wet/dry signal, which improved usability.
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Some users find the pedal challenging to tame, leading to selling and repurchasing due to its captivating sound.
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Owners appreciate the Q-Tron Plus's unique control combination, especially for settings like Low Pass, Slow Response, Low Range, and Up Sweep, which aren't fully replicated in most alternatives.
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Use cases and applications

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Pairing the Q-Tron Plus with an octave pedal is highlighted as a method to achieve sounds reminiscent of Jerry Garcia’s style.
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Running delay effects through the Q-Tron Plus's FX loop allows the envelope filter to trigger without affecting delay repeats, adding a unique dimension to the sound.
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The Q-Tron Plus is favored for its ability to achieve the "low and slow" sound preferred by bass players, a feature that is difficult to find in other envelope filters.
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Setup and maintenance

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Owners recommend placing a compressor right after the Q-Tron Plus to manage volume spikes effectively.
Source

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4.5 out of 5

Based on 5 Reviews and 32 Ratings

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zlossi

648

3 months ago

Its my new favorite toy!

Its my new favorite toy ! Im loving it You will have fun with this I promise you that

Roles:

Guitarist Bassist

Genres:

Funk / Soul Motown R&B

From Gear Setup

michal_gorecki

114

almost 8 years ago

Instant John Mayer envelope filter tone

If you like guitar tones from "I don't trust myself on loving you" or "Rosie" - that's definitely a way to go. Works very well with twangy funky picking

josh_valeo

111

almost 9 years ago

Looking for the Funk? Found the Funk

For those looking for something funky or simply a guitarist looking for that "Jerry tone", this is what you need. It's a popular envelope filter that works great in so many ways.

Roles:

Bassist

Genres:

Electronic Rock Pop