GR Bass Groovy Real Tube Preamp Basgitaareffect

Tube Preamp Pedal for Electric Bass with Built-in DI

The GR Bass Groovy Real Tube Preamp combines a real vacuum tube preamp, 4-band EQ, separate Drive and Distortion sections, and dual XLR DI outputs in one floorboard pedal. It offers a 6.3 mm jack input and output plus two balanced XLR DI outputs, and works as a complete preamp, tube DI box, recording tool or tone-shaping pedal on stage and in the studio.

What Sets the Groovy Apart

The Groovy is built around a real tube that delivers warmth, rich harmonics and natural saturation, covering everything from clean flat tones to warm vintage and aggressive modern sounds. Its two independent XLR outputs split the job: one carries the pure tube DI signal (Pre-EQ), the other the fully processed balanced signal (Post-EQ).

Signal Flow and Connections

The I/O layout supports live and studio workflows with separate amp and console paths.

• Input / Amp Output: 6.3 mm jack — feeds the stage amplifier
• DI Outputs: 2 balanced XLR (Pre-EQ and Post-EQ) — Pre-EQ is the clean tube signal; Post-EQ is the fully shaped signal with adjustable level
• Power Supply — 12V DC adapter (not included)

EQ and Filter Controls

A 4-band EQ plus dedicated filter switches give bassists detailed tone control.

• 4-Band EQ: Low, Mid-Low, Mid-High, High — four bands for detailed tone shaping
• V-Filter + Deep Switches — V-Filter gives a more open, modern response; Deep adds extra low end
• Bright Switch — adds extra attack and brilliance

Drive, Distortion, and Master Section

Three footswitches (On/Off, Drive and Distortion) and two distinct drive characters, one classic tube-style and one modern and aggressive.

• Drive Section: Drive + Volume controls, dedicated footswitch — adds overdrive with its own level control
• Distortion Section: Dist control, dedicated footswitch — for heavier, more aggressive tones
• Gain + Master: input gain and overall output level