The Electro-Harmonix Q-Tron Plus is an Electro-Harmonix envelope filter pedal, currently around $162.43. Close alternatives include the Aitone AT-08 and the IVY Filter IV v2. It pairs well with the Park P50 Classic and the Bad Cat Cub.

Electro-Harmonix Q-Tron Plus

Electro-Harmonix · pedal

The Electro-Harmonix Q-Tron Plus is an envelope-following filter pedal delivering dynamic, funky tones responsive to pick dynamics and guitar volume. Its three-band EQ and mix control provide extensive tonal shaping from subtle color to dramatic expression effects. The Q-Tron Plus remains popular for creating responsive, expressive sounds in funk, rock, and experimental contexts.

What stands out

  • “Standout weakness: requires a 24V power supply incompatible with most standard pedalboard power bricks, and placement in the signal chain matters for getting the best filter response”

    — from the community notes

  • “The Electro-Harmonix Q-Tron Plus is an envelope-following filter pedal delivering dynamic, funky tones responsive to pick dynamics and guitar volume”

    — from the listing

  • “Strengths: mode switching for genuinely different filter characters, responsive touch dynamics, and a compact footprint relative to earlier Q-Tron models”

    — from the reviews

  • “The Q-Tron Plus delivers versatile envelope-filtered tones across guitar and synth signals, with switchable LP/BP/HP modes and a Peak control giving real sound-design range beyond a single fixed filter voice”

    — from the reviews

  • “its three-band eq and mix control provide extensive tonal shaping from subtle color to dramatic expression effects”

    — from the listing

  • filter
  • dynamic
  • responsive
  • envelope
  • mix
  • expressive
  • boost
  • synth

Price updated Oct 23, 2026

Genres the Electro-Harmonix Q-Tron Plus is commonly used in

  • Funk
  • Experimental
  • Rock
  • Soul
    citedInferred from shared tonal signals, not a stated genre tag.
  • Electronic
    citedInferred from shared tonal signals, not a stated genre tag.
  • Bedroom Pop
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Electro-Harmonix Q-Tron Plus

Park P50 Classic

Park

40% match

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Park P50 Classic leans this dynamic tone toward compressed, which it doesn't make on its own

Comes later in the signal chain

Bad Cat Cub

Bad Cat

37% match

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Bad Cat Cub leans toward harmonically rich, and that's a real, usable character to pair with

Comes later in the signal chain

Ceriatone British Style 2525

Ceriatone

tonal match

Comes later in the signal chain

Into a dynamic tone, Ceriatone British Style 2525 brings a pull toward compressed that's missing

Vox AC30S1 OneTwelve 30W 1x12 Combo

Vox

tonal match

Comes later in the signal chain

Into a dynamic tone, Vox AC30S1 OneTwelve 30W 1x12 Combo brings a pull toward compressed that's missing

Mesa/Boogie Stiletto Deuce Stage II

Mesa Boogie

tonal match
$1147.50via Reverb

Comes later in the signal chain

Mesa/Boogie Stiletto Deuce Stage II leans this dynamic tone toward compressed, which it doesn't make on its own

Friedman Small Box 50W EL34 Amp Head

Friedman

tonal match

Comes later in the signal chain

Friedman Small Box 50W EL34 Amp Head leans this dynamic tone toward compressed, which it doesn't make on its own

Fryette Power Station 100

Fryette

tonal match
$1199via Reverb

Comes later in the signal chain

Fryette Power Station 100 leans this dynamic tone toward compressed, which it doesn't make on its own

Kustom HV30 Tube

Kustom

tonal match
$234.52via Reverb

Comes later in the signal chain

Kustom HV30 Tube leans this dynamic tone toward compressed, which it doesn't make on its own

Pedals that stack with the Electro-Harmonix Q-Tron Plus

Origin Effects RevivalDrive

Origin Effects

37% match

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Into a dynamic tone, Origin Effects RevivalDrive brings a pull toward compressed that's missing

Comes later in the signal chain

Dunlop MXR Distortion Plus

Dunlop

37% match

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)

Dunlop MXR Distortion Plus leans this dynamic tone toward compressed, which it doesn't make on its own

Comes later in the signal chain

Keeley Halo

Keeley

18% match

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Run Keeley Halo after Electro-Harmonix Q-Tron Plus in the signal chain, where it won't crowd Electro-Harmonix Q-Tron Plus — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

JHS Lucky Cat Delay limited edition

JHS Pedals

17% match
$281.42via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep Electro-Harmonix Q-Tron Plus's dynamic voice out front: JHS Lucky Cat Delay limited edition goes after Electro-Harmonix Q-Tron Plus in the signal chain so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

DigiTech DOD Compressor 280

Digitech

tonal match
$119.23via Reverb

Comes later in the signal chain

DigiTech DOD Compressor 280 leans this dynamic tone toward compressed, which it doesn't make on its own

DigiTech XBS Bass Squeeze

Digitech

tonal match
$95.94via Reverb

Comes later in the signal chain

DigiTech XBS Bass Squeeze leans this dynamic tone toward compressed, which it doesn't make on its own

Fairfield Circuitry 20% More

Fairfield Circuitry

tonal match
$451.45via Reverb

Comes later in the signal chain

Fairfield Circuitry 20% More leans this dynamic tone toward compressed, which it doesn't make on its own

Tech 21 CompTortion

Tech 21

tonal match

Comes later in the signal chain

Into a dynamic tone, Tech 21 CompTortion brings a pull toward compressed that's missing

Cheaper alternatives

Boutique & premium upgrades

Similar charactersee all similar tone character →

See all alternatives to the Electro-Harmonix Q-Tron Plus (cheaper + boutique) →

Questions people ask

What are good alternatives to the Electro-Harmonix Q-Tron Plus?+

The closest matches in character are the Aitone AT-08, the IVY Filter IV v2, the Emma DiscomBOBulator. Budget picks: Behringer Meatball Restyled, Electro-Harmonix XO Micro Q-Tron, Electro-Harmonix Nano Q-Tron. Boutique upgrades: Xotic Robotalk 1 New Old Stock, Maxon AF-9 Auto Filter, Spaceman Artemis Modulated Filter.

What pairs well with the Electro-Harmonix Q-Tron Plus?+

Strong matches from rig and tone-complementarity evidence: Park P50 Classic, Bad Cat Cub, Ceriatone British Style 2525 — Park P50 Classic leans this dynamic tone toward compressed, which it doesn't make on its own.

How much does the Electro-Harmonix Q-Tron Plus cost?+

Around $162.43 (live listing price, updated Oct 23, 2026).

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