Parasound JC 1 mono power amplifier by John Curl

Features Parasound JC 1

• Circuit design by the legendary John Curl
• Ultra-high bias Class A/AB operation
• 25 watts of pure Class A power
• Stable with speaker impedance drops below 1Ω
• Bybee Music Rails™ - active high frequency filters for the input stage
• New John Curl driver stage uses cascode switching for greater open-loop bandwidth and superior linearity
• Gain switch to select 29dB or 23dB gain for optimal compatibility with high gain preamplifiers or extremely efficient speakers
• R-core transformer for the input stage suppresses interference on the power line
• 6 massive 33,000uF Nichicon Gold Tune filter capacitors for the output stage
• 22,400uF filter capacitors of the power supply input stage, independent of the main power supply
• Dual CHK Infinium, custom 5-way speaker terminals for easy bi-wiring
• Balanced XLR input and loop output jacks with Neutrik locking
• Vampire 24k gold plated RCA input and loop output jacks
• Directly coupled signal path, no capacitors or inductors in the audio path
• JFET input stage, MOSFET driver stage
• 24 beta-matched bipolar output transistors (15 amp, 230V, 60 MHz)
• 2.1 kVA shielded toroidal power transformer with premium grade H18 core
• Independent power supplies for input stage, driver stage and output stage
• Full power down to 2 Hz for unrestricted deep bass
• Harris hyperfast soft recovery diode bridge rectifiers
• REL & Nichicon Muse capacitors
• DC servo and relay protection circuits
• AC inrush surge protection with relay bypass
• Automatic switching on via 12 V trigger or audio sensors
• 4-rack enclosure with rear carry handles
• Rack mounting hardware is included
• Available in silver or black

Changes from the JC 1 to JC 1+

Read the JC 1+ development story here

• • 400 → 450 Watts @ 8Ω
  • 800 → 850 Watts @ 4Ω
  • 1200 → 1300 Watts @ 2Ω
  • Filter capacitance: 132,000 → 198,000 uF
  • Transformer capacity: 1.9 → 2.1 kVA
  • Output transistors: 18 → 24 Sanken 60Mz devices
  • Peak current: 135 → 180 amps
  • Weight: 64 → 83 lbs net
  • Bybee Music Rails™ active high frequency noise filters
  • John Curl driver stages employs a new cascode circuit design
  • FR-408 input circuit board material improves HF signal integrity
  • Gain switch to select 29 dB or 23 dB of gain
  • R-core power transformer for input stage
  • Input circuit board is shielded
  • Double thickness copper on output/power supply circuit boards
  • Gold-plated internal audio signal path connectors
  • Custom CHK Infinium speaker binding posts
  • Looping Neutrik XLR output for easier bi-amping
  • Front panel power indicator LED
  • Updated auto turn on circuits with 3.5mm 12V trigger jacks