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Average Price: $178
Standard/Professional
$70
$251+
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Price History
Based on price data from 6 merchants for "Electro-Harmonix Q-Tron Plus (Vintage)". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Elevate your sound and take your music to unexplored heights with the Electro-Harmonix Q-Tron Plus (Vintage), a must-have for any guitarist looking to add a dynamic edge to their setup. Designed by the legendary Mike Beigel, this envelope filter pedal is a refined iteration of the classic Q-Tron, offering enhanced versatility with its unique effects loop and Attack Response Switch. The effects loop allows you to integrate your favorite pedals between the preamp and filter sections, giving you the freedom to craft entirely new sonic landscapes without altering the envelope drive.
The Q-Tron Plus doesn't stop there. It's equipped with a variety of controls including Mode, Response, Range, Peak, Gain, and Boost, granting you precise control over your sound. Whether you're after a fast, biting response or a smooth, vowel-like attack, the selectable low pass, band pass, and high pass filters have got you covered. With its dedicated effects loop, the Q-Tron Plus invites you to unleash your creativity by chaining effects in novel ways, making it an indispensable tool for any musician wanting to push boundaries and explore new musical territory.
Key Features:
- Designed by Mike Beigel, inventor of the legendary Mu-Tron III
- Dedicated effects loop allows placement of effects between preamp and filter
- Response switch for fast or slow attack
- Selectable low pass, band pass, and high pass filters
- Resonant peak control for adjusting filter’s Q
- Sweep direction switch for upward or downward filter sweeps
- Adjustable gain knob and boost switch
- LED indicators for effect engagement and signal overload
- Includes 24DC-100 power supply
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
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What does the effects loop on the Electro-Harmonix Q-Tron Plus do?
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The effects loop allows you to insert additional effects between the Q-Tron Plus's preamp and filter section without affecting the envelope drive, which is especially useful with distortion pedals.
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Is the Electro-Harmonix Q-Tron Plus suitable for bass guitar?
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Yes, the Electro-Harmonix Q-Tron Plus works well with bass guitars, providing dynamic filter effects that can enhance the instrument's tonal range.
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What power supply is required for the Electro-Harmonix Q-Tron Plus?
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The Electro-Harmonix Q-Tron Plus requires a 24V DC power supply, which is included with the pedal.
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Does the Electro-Harmonix Q-Tron Plus have true bypass?
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Yes, the Electro-Harmonix Q-Tron Plus features true bypass, ensuring your signal remains unaffected when the pedal is not engaged.
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What type of filter is the Electro-Harmonix Q-Tron Plus?
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The Electro-Harmonix Q-Tron Plus is an envelope-controlled filter, which dynamically responds to the input signal's amplitude to create unique filtering effects.
Videos
ehpedals
Q-Tron Plus - Demo by Dave Weiner - Envelope Filter with Effects Loop - Electro Harmonix
Reviews
PROS
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Offers a wide range of vintage and modern funk tones
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Mix mode allows blending of clean and effect signals
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Instant tracking with no delay for responsive play
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Effects loop offers versatile tone shaping options
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Built-in boost replicates classic Jerry Garcia tones
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Excellent for single pedal chain setups
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Highly adjustable with multiple sweep and mode options
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Compact size compared to original Q-tron models
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Great for both guitar and bass applications
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Known for sturdy build quality and durable design
CONS
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Makes a loud popping noise when switching on/off
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Colours tone when used with other pedals in the chain
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Requires 24V power supply, which may need adapters
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Volume boost can be hard to manage without extra equipment
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May lack versatility for users seeking multiple effects in one pedal
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 (Vintage).
Features and functionality
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The Q-Tron Plus excels for bass players using gain stages, providing a unique setup order for optimal tone.
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The older big box design was phased out around 2006-2007, with the XO version replacing it.
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The 1997 reissue of the Q-Tron Plus contains five JRC4558D chips, the same type found in the TS-808 Tube Screamer, contributing to its distinct sound.
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The older Q-Tron Plus model includes a valuable effects loop that allows integration of additional pedals like phasers or dirt pedals.
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Use cases and applications
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Bass players often use a specific chain: tuner -> Q-Tron -> send -> gain -> true bypass loop -> Q-Tron return -> Q-Tron out -> modulation.
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The Q-Tron Plus effectively captures the signature sound for songs like "Shakedown Street" and "Fire on the Mountain," particularly favored by those seeking a Jerry Garcia-like tone.
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Other
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It's noted that the Q-Tron Plus is favored among players for its compatibility with gain stages, particularly in bass setups.
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Mods and upgrades
Build quality
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Some vintage Q-Tron models are marked "Made in New York City," while others say "Made in NYC," indicating slight variations in production.
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Value and pricing
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Vintage Q-Tron Plus pedals have seen a significant price increase, with some listings reaching up to $375, reflecting their growing rarity and demand.
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Comparisons
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The Mu-Tron Microtron IV is frequently recommended over the Q-Tron for achieving a more authentic Jerry Garcia tone.
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