Roland no longer enforces copyright on these old schematics for personal use. However, if you plan to sell modded amps or PCBs based on it, consult a lawyer. For repair, always discharge power supply caps (±45V, ±15V) before probing.
Uses a Bucket Brigade Device (BBD) for its signature lush sound. jc-120 schematic
First introduced in 1975, the circuit has seen multiple revisions, but its core philosophy remains: a pristine, transparent clean tone that acts as a perfect canvas for effects. Roland - Global Architecture and Design Roland no longer enforces copyright on these old
The Marshall JC-120, also known as the JCM120 or JC120, is a guitar amplifier head that was introduced in the late 1980s. It's a 120-watt, two-channel amp that features a unique combination of EL34 power tubes and 12AX7/ECC83 preamp tubes. The JC-120 is renowned for its flexibility, allowing players to dial in a wide range of tonal colors, from pristine clean tones to rich, overdriven sounds. Uses a Bucket Brigade Device (BBD) for its