The Demon FX Microtube D7K "Bass" Preamp is a Demon Fx preamp pedal, currently around $78.80. Close alternatives include the Demon FX Microtubes A7K Bass Preamp and the Ashdown James LoMenzo Mega Drive. It pairs well with the Benson Amps Stonk BOX and the JAM Pedals Tubedreamer.

Demon FX Microtube D7K "Bass" Preamp

Demon Fx · pedal

The Demon FX Microtube D7K is a budget bass preamp and overdrive pedal from the Chinese effects manufacturer Demon FX, designed in the Darkglass Microtubes B7K circuit tradition with a 4-band active EQ plus hi and lo pass filters. Delivers aggressive transistor bass overdrive with extensive bass-specific EQ for modern aggressive bass tones. The D7K provides Darkglass-B7K-adjacent performance at budget pricing.

  • bass
  • eq
  • filter
  • preamp
  • modern
  • overdrive
  • aggressive
  • transistor

Good for

  • Live
  • Silent Recording
  • Studio
$78.80View on Reverb

Price updated Aug 27, 2026

Genres the Demon FX Microtube D7K "Bass" Preamp is commonly used in

  • Metal
  • Djent
  • Alternative
    citedInferred from shared tonal signals, not a stated genre tag.
  • Acoustic
    citedInferred from shared tonal signals, not a stated genre tag.
  • Rock
    citedInferred from shared tonal signals, not a stated genre tag.
  • Funk
    citedInferred from shared tonal signals, not a stated genre tag.

Pedals that stack with the Demon FX Microtube D7K "Bass" Preamp

Benson Amps Stonk BOX

Benson Amps

9% match
$229via Reverb

Benson Amps Stonk BOX leans toward germanium, and that's a real, usable character to pair with

JAM Pedals Tubedreamer

Jam Pedals

9% match

JAM Pedals Tubedreamer leans toward compressed, and that's a real, usable character to pair with

Electro-Harmonix Small Stone

Electro-Harmonix

9% match
$239.58via Reverb

Electro-Harmonix Small Stone's analog warmth voice goes after Demon FX Microtube D7K "Bass" Preamp in the signal chain — it's not there to compete with Demon FX Microtube D7K "Bass" Preamp's own aggressive character

Ashdown Macchiato Compressor Guy Pratt Signature

Ashdown

7% match
$260.05via Reverb

Ashdown Macchiato Compressor Guy Pratt Signature's own compressed character is the real reason this is worth trying

Dunlop - MXR Carbon Copy Deluxe Analog Delay

Dunlop

6% match
$305.90via Reverb

Put Dunlop - MXR Carbon Copy Deluxe Analog Delay after Demon FX Microtube D7K "Bass" Preamp in the signal chain, clear of Demon FX Microtube D7K "Bass" Preamp's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Empress Echosystem

Empress

6% match
$481.63via Reverb

Keep Empress Echosystem after Demon FX Microtube D7K "Bass" Preamp in the signal chain, clear of Demon FX Microtube D7K "Bass" Preamp's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Fortin Amplification Tempest Overdrive Signature Architects

Fortin Amplification

tonal match
$320.79via Reverb

Into Demon FX Microtube D7K "Bass" Preamp, Fortin Amplification Tempest Overdrive Signature Architects is right at home: it's built around a high-gain amp's front end

Friedman Buxom Boost

Friedman

tonal match
$169via Reverb

Friedman Buxom Boost's own voicing points at a high-gain amp's front end, and Demon FX Microtube D7K "Bass" Preamp delivers it

Cheaper alternatives

Demon FX Bear PAW Analog Bass Preamp

Demon Fx

67% similarity
$47.80via Reverb

Shared character: bass, amp, preamp

Boutique & premium upgrades

Ampeg Classic Analog Bass Preamp pedal

Ampeg

69% similarity
$120.67via Reverb

Shared character: preamp, bass, metal

MXR Thump Bass Preamp

MXR

68% similarity
$139.99via Reverb

Shared character: filter, preamp, bass

Aguilar - OBP-1TK On-Board Bass Preamp

Aguilar

67% similarity
$146.92via Reverb

Shared character: amp, preamp, bass

Aguilar DB 925

Aguilar

67% similarity
$139via Reverb

Shared character: preamp, bass

Walrus Audio Mantle Analog Bass Pre-Amp/DI

Walrus Audio

67% similarity
$749.99via Reverb

Shared character: filter, preamp, bass

Electro-Harmonix Bass Metaphors

Electro-Harmonix

67% similarity
$135.75via Reverb

Shared character: amp, preamp, bass

Similar charactersee all similar tone character →

Demon FX Microtubes A7K Bass Preamp

Demon Fx

84% similarity

Shared character: aggressive_playing, amp, preamp

Ashdown James LoMenzo Mega Drive

Ashdown

71% similarity

Shared character: filter, aggressive_playing, amp

Electro-Harmonix Nano Operation Overlord

Electro-Harmonix

70% similarity
$78.78via Reverb

Shared character: amp, bass, metal

Behringer BDI21

Behringer

67% similarity

Shared character: preamp, bass, overdrive

AnalogWorkshop TB5

Analogworkshop

62% similarity

Shared character: preamp, bass

Tech 21 GED-2112 Bass

Tech 21

95% similarity

similar tone character

See all alternatives to the Demon FX Microtube D7K "Bass" Preamp (cheaper + boutique) →

Questions people ask

What are good alternatives to the Demon FX Microtube D7K "Bass" Preamp?+

The closest matches in character are the Demon FX Microtubes A7K Bass Preamp, the Ashdown James LoMenzo Mega Drive, the Electro-Harmonix Nano Operation Overlord. Budget picks: Demon FX Bear PAW Analog Bass Preamp. Boutique upgrades: Ampeg Classic Analog Bass Preamp pedal, MXR Thump Bass Preamp, Aguilar - OBP-1TK On-Board Bass Preamp.

What pairs well with the Demon FX Microtube D7K "Bass" Preamp?+

Strong matches from rig and tone-complementarity evidence: Benson Amps Stonk BOX, JAM Pedals Tubedreamer, Electro-Harmonix Small Stone — Benson Amps Stonk BOX leans toward germanium, and that's a real, usable character to pair with.

How much does the Demon FX Microtube D7K "Bass" Preamp cost?+

Around $78.80 (live listing price, updated Aug 27, 2026).

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Demon FX Microtube D7K "Bass" Preamp — NodeTone