No two Dumbles are the same, but it's the Dumble Overdrive Special that continues to reign as the man's pinnacle design. The amplifier boasts unique sound and feel that is praised for its ability to enhance and uncover every nuance of a player's technique and tone.

Because these mythical amps are extremely hard to come by, Synergy created the OS preamp module, a tribute to its iconic sound. The OS module packs the Dumble personality and user experience in a compact format, providing affordability and convenience that the original can never match.

Across the front panel, the OS features the same basic controls as the Overdrive Special amplifier. Dual footswitchable channels enable switching between the unique Dumble clean with its mid-forward clarity to the fabled smooth, singing sustain that gives the Overdrive Special its name. You'll also find Bright and Deep, along with Rock/Jazz switches that - along with a 3-band EQ - tailor your tone while always retaining the Dumble character. Finally, a master presence control adds just the right amount of clarity to the preamp module's OD mode.

• 2 preamp channels - interchangeable design
• Bass, Mid, Treble, OD Level, OD Ratio, Presence, Master & Volume controls
• Two 12AX7 preamp tubes
• Bright, Deep, Rock/Jazz switches
• Three-position cathode select switch
• Dimensions: 5.5 in. (L) x 7 in. (W) x 1.5 in. (H)
• Weight: 1 lb.