Microtubes B7K 2.0 Analog Bass Preamp & Overdrive

Sale priceCAD$449.95
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Design and Tone. Perfected. 

Tone crushing overdrive and super transparent modern sound is the essence of the Microtubes B7K. One of the most acclaimed Darkglass pedals in the bass community, it doesn´t compromise the original sound of the instrument, but it enhances its presence in the mix.

Front Features


Mixes the clean input signal with the overdriven signal. The clean signal remains at unity gain while the volume of the overdriven signal is set by the Level knob, allowing for fine control of the blend ratio. 


Sets the volume of the overdriven signal. 


Sets the amount of saturation in the overdriven signal. 

Attack Switch

Sets the amount of treble content to saturate: The “Boost” setting emphasizes the treble content extra clarity and presence.

The “Flat” position leaves this register untouched while the “Cut” position will reduce the amount of high frequencies being saturated.

This new addition helps to keep the treble portion of the signal under control, specially useful when playing with new strings and/or cabinets with tweeters! 

Grunt Switch

Sets the amount of low frequency content to saturate by selecting between three different bass boost levels before the clipping stage. 


+-12dB @ 100Hz 

Low Mids Switch

This switch change the center frequency of the Low Mids from 1kHz to 500Hz. 

Low Mids

+-12dB @ 500Hz 

Hi Mids

+-12dB @ 1.5kHz 

Hi Mids Switch

This switch change the center frequency of the Hi Mids from 3kHz to 1.5kHz. 


+-12dB @ 5kHz

Input & Outputs


Connect from the ¼” Output jack to the input of your amplifier or another effects pedal. 

Ground Lift

Use this control to lift the ground of the XLR output. If you are experiencing ground noise in your DI signal, try changing this control.

Direct Output

A balanced version of the ¼” output, useful for running into PA’s or studio mixing consoles. 


Connect your instrument or output from your pedal board to the ¼” mono jack.


Only use a regulated 9V DC adapter with a center-negative plug.

Parallel Output

A passthrough for your input signal, useful for parallel processing.

Video Review: Microtubes B7K 2.0 Analog Bass Preamp & Overdrive


Brand Darkglass Electronics
Weight (kg) 0.38 kg
Width (cm) 10.6
Length (cm) 12.0
Height (cm) 4.5
Battery No
Expression No
Jacks position on top No
Switching presets No
Power Supply 9 Volt
Tap tempo No
Bypass Buffered bypass
Digital or Analog Analog
Current Draw, mA 20
Input Impedance, kΩ 500
Output Impedance, Ω 1000
Best For Bass Guitars

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