Jc-120 Schematic [portable] Page

Introduction

Technical Communities: Enthusiast forums like SSGuitar often host specific schematic versions, such as the "1984" op-amp based design or earlier discrete versions. jc-120 schematic

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. MN3004 or MN3204 BBD (Bucket Brigade Delay) Clock

This is a request for the Roland JC-120 (Jazz Chorus) amplifier schematic. from pristine clean tones to rich

Introduction

: The analog chorus effect relies on BBD chips (like the MN3002 or similar) to create the short, modulated delays required for the chorus and vibrato sounds. Google Groups Circuit Evolution and Variations

The Roland JC-120 Jazz Chorus Go to product viewer dialog for this item.

B. Chorus / Vibrato Section

  • MN3004 or MN3204 BBD (Bucket Brigade Delay)
  • Clock driver: MN3101 or MN3102
  • LFO: dual op-amp (one for chorus, one for vibrato)
  • Summing stage after BBD mixes dry + delayed signal