Darkglass Electronics Microtubes B7K Ultra Series Bass Preamp Pedal

Master

Whereas the Level Knob controls the output of the overdrive section the Master volume adjusts the overall volume of the unit. Ideal for fine tuning the output on clean mode. It also serves as a DI level control.

Blend

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.

Level

Sets the volume of the overdriven signal 

Drive

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.

Grunt Switch

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

Bass

+-12dB @ 100Hz

Lo Mids

+-12dB switchable 250Hz, 500Hz and 1kHz

Hi Mids

+-12dB switchable 750Hz, 1.5KHz and 3kHz

Treble

+-12dB @ 5kHz

Dimensions

Width: 125 mm / 5″
Length: 96 mm/ 3¾″
Height: 57 mm / 2¼″
Weight: 430 g / 0.95 lb 

Warning

When the pedal is on bypass the master volume does not affect the headphone volume. In this case the total volume is adjustable in Darkglass Suite. With sensitive headphones, the bypass volume can be very loud if not adjusted.

The Microtubes B7K Ultra has a current draw of 120mA. Only use a regulated 9V DC adapter with a center-negative plug.

Unregulated power supplies and/or higher voltages may result in suboptimal noise performance and even damage your unit, voiding the warranty.