Used Guyatone GSTC04 Ultrem Optical Tremolo Effect Pedal

Add vintage-inspired tremolo depth to your tone with this used Guyatone GSTC04 Ultrem Optical Tremolo pedal, in good condition with only minor cosmetic wear. Designed with an optical tremolo circuit for smooth, pulsating modulation, the Ultrem delivers rich, analog-style shimmer that’s perfect for surf rock, ambient textures, and dynamic rhythm work. Featuring intuitive Speed and Depth controls, this compact and pedalboard-friendly unit is easy to dial in, whether you're going for subtle wave-like motion or choppy stutter effects. Powered by a standard 9V DC adapter (center-negative, not included), it offers true bypass switching to preserve your core tone when disengaged. With rugged metal construction and Guyatone’s reputation for tone quality, the GSTC04 is a reliable choice for players seeking classic tremolo character in a space-saving design.