• Circuitry designed by John Curl
• THX Ultra-certified
• Direct Coupled -- no capacitors or inductors in signal path
• DC Servo and relay protection circuits
• High bias Class A/AB operation
• 1.6 kVA Toroid power transformer with independent secondary windings for each channel, 100,000 µF power supply filter capacitance
• Independent power supplies for each channel
• Input stages use hand matched complementary JFETs
• 30 beta-matched 15 amp, 50 MHz bipolar output transistor
• AC present, standby/normal, current overload indicators
• Rear mounted gain controls and rear handles
• 12 volt DC automatic turn-on circuitry; ground lift switch 
• Tiffany-style RCA input jacks
• Gold-plated 5 way speaker binding posts
• Custom designed removable IEC AC cord
• 3 rack space height front panel
• Rack mounting adapter available

• Continuous Power Output - Each Channel:
  140 watts RMS x 5, 20 Hz - 20 kHz, 8 Ω;
  200 watts RMS x 5, 20 Hz - 20 kHz, 4 Ω
• Current Capacity:
  45 amperes peak per channel
• Slew Rate:
  130 V/µsecond
• Power Bandwith:
  5 Hz - 100 kHz, +0/-3 dB at 1 watt
• Total Harmonic Distortion:
  < 0.03 % at full power; < 0.01 % typical levels
• IM Distortion:
  < 0.03 %
• TIM:
  unmeasurable
• Dynamic Headroom:
  > 1.5 dB
• Interchannel Crosstalk:
  > 80 dB at 1 kHz
  > 60 dB at 20 kHz
• Input Impedance:
  33 k Ω
• Input Sensitivity:
  1 V for 28.28 V, THX Reference Level; 1.2 V for full output
• S/N Ratio:
  > 117 dB, full power; > 96 dB, THX Reference Level
• Damping Factor:
  > 800 at 20 Hz Power Consumption: 1500 watts
• Dimensions:
  w 17 1/4" x h 5 1/4" x d 19", h 6" with feet
• Net Weight:
  46 lb.

HCA 1203A/1205A Manual