This used Catalinbread Formula No. 5 effect pedal is in great condition and delivers rich, touch-sensitive overdrive inspired by classic tweed-era American amplifiers. Designed to capture the gritty, dynamic tone of mid-20th century tube amps, it features a streamlined control layout with Gain, Tone, and Volume knobs, making it easy to dial in vintage warmth or aggressive drive. Powered by a standard 9V DC power supply (not included), the Formula No. 5 is true bypass for clean signal integrity when not in use. With its durable construction and authentic vintage voicing, this pedal is perfect for blues, rock, and roots players who crave that unmistakable old-school crunch in a compact, pedalboard-friendly design.