DooBass PreAmp

Kosko FX DOOBASS is a versatile analog preamp that brings the legendary Ampeg SVT character to your pedalboard. Built on an all-analog circuit, it perfectly captures the punch, grit, and dynamic response of the classic "fridge" stack.
The pedal offers unmatched tonal flexibility thanks to its specialized filter section. With Ultra Low, Ultra High, and Bright switches, you can instantly reshape your sound—from deep, scooped sub-bass to aggressive, mid-forward guitar tones. To further refine your drive, we’ve included multiple clipping options, allowing you to toggle between compressed, vintage-style grit and wide-open, powerful distortion.
Designed for both the stage and the studio, the DOOBASS features a dedicated CabSim output. This analog cabinet simulator smooths out the high-end fizz, making it perfect for direct recording or silent home practice. Plug straight into your interface or a PA system and get a mix-ready, massive bass tone without any plugins. Handbuilt for those who demand more from their low-end.

Effect Type: Overdrive / Preamp
Circuit: Baja Ampeg SVT Preamp
Power Supply: 9V DC, center negative
Bypass Type: True Bypass
Controls: Volume, Gain, Bass, Treble, Mid, Mid Freq, Clipping
Dimensions: 1145 х 121 х 39 mm
Enclosure: Aluminum (1590XX format)
Features: Handmade