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
Features the same clean preamp but adds the legendary Chorus, Vibrato, Reverb, and Distortion circuits. 2. The Stereo Chorus Circuit
The JC-120, like any tube amplifier, requires periodic maintenance to ensure optimal performance and reliability: jc-120 schematic
If you are using the schematic to repair a vintage or modern JC-120, look closely at these frequent failure points:
Transitioned to highly stable BBD chips and standardized op-amps. Added toggle switches for chorus selection. MN3007 BBD chip, MN3101 clock. Roland JC-120 Go to product viewer dialog for this item
These often use discrete transistors in the preamp section and typically have a toggle power switch.
Are you looking to (like a dead chorus or hiss), or are you building a clone circuit ? Identifying Your Version Features the same clean preamp
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