The real McCoy! The SR-71 Blackbird™ “Tube Tone Engine” is a full-featured vacuum tube preamp, in a pedal. Designed for tone & versatility, the  SR-71 will add clean/drive/distortion channels to vintage/boutique guitar amps, or work as a stand-alone direct recording tube preamplifier. The clean channel possesses a beautifully pure, “glassy” character, and the drive channel is tuned to deliver a rich, full-bodied, devastatingly smooth overdrive.

“If distortion can be described as ‘beautiful’, this is it.” — The ToneQuest Report