Gearmanndude Time Bomb Boost. The TBB is a direct clone of the classic 70's Gray and Yellow DOD 250 Preamp Overdrive pedal. I use the same 741-JRC chip, along with top quality components. It's a great clean boost, with a gain control that can really dirty it up if you so desire. Crazy-cool clear boost with dirt knobbie options for your tone chain. • MFSKU Time Bomb Boost