Schematic 2021 | Jc-120

Roland JC-120 Go to product viewer dialog for this item. has been in production since 1975, and its internal circuitry has changed significantly over the decades. To find the correct "piece" or component for your repair, you first need to identify which version you have. Identifying Your Version

In the pantheon of guitar amplification, tube amplifiers are often idolized for their warmth and saturation. However, the Roland JC-120 Jazz Chorus stands as a colossal exception—a solid-state amplifier that achieved legendary status not by mimicking tubes, but by leveraging the pristine, clean headroom that only transistors could provide. Released in 1975, the JC-120 became the backbone of the new wave, punk, and indie rock movements. To understand why this amplifier sounds the way it does, one must look past the control panel and delve into the schematic. The circuit design of the JC-120 is a masterclass in high-fidelity audio engineering, defined by three core pillars: the operational amplifier preamp, the analog chorus implementation, and the high-voltage power amp section. jc-120 schematic