Parasound Halo JC 3 Jr. Phono Preamplifier

Description

• Circuitry designed by legendary John Curl
• Circuit board layout by Carl Thompson
• Cartridge options for 47k Ω MM and MC/MI
• Variable MC impedance adjustment of 50-550 ohms
• Gain select for 40 dB/50 dB/60 dB unbalanced (46 dB/56 dB/66 dB balanced)
• Balanced and unbalanced outputs
• Mono switch can improve sound of mono & older LPs
• Convenient auto turn-on by 12V trigger
• RIAA accurate to within 0.2 dB
• Incredible S/N up to 94 dB and THD less than 0.02%
• Vishay-Dale resistors in the audio path
• Aluminum shield separates power supply and audio circuits
• Shielded toroid power transformer
• High speed-soft recovery bridge rectifiers and common mode inductors
• Vampire brand 24k gold-plated RCA jacks
• Neutrik brand locking balanced XLR outputs connectors
• Compact 1U chassis (2.5″ high with feet)
• Available in silver or black
• Frequency Response:
  20-20Khz, +/- 0.2dB
• Total Harmonic Distortion
  < 0.02% at 1 kHz
• Signal to Noise Ratio, 40 dB Setting
  >85dB, input shorted, IHF A-weighted
  >80dB, input shorted, unweighted
• Signal to Noise Ratio, 50 dB Setting
  >89dB, input shorted, IHF A-weighted
  >84dB, input shorted unweighted
• Signal to Noise Ratio, 60 dB Setting
  > 94dB, input shorted, IHF A-weighted
  > 91dB, input shorted, unweighted
• Inter-channel Crosstalk
  >80 dB at 1 kHz
• Input Impedance
  MM or MI: 47k Ω
  MC Variable: 50- 550 Ω
• Output Impedance
  Unbalanced: < 100 Ω
  Balanced: < 100 Ω per leg
• Input Capacitance
  150 pF
• Input Sensitivity at 1 kHz, 4mV Input
  40 dB: 4 mV for 450mV output
  50 dB: 4 mV for 1.4 Volts output
  60 dB: 4 mV for 4.25 Volts output
• Input Sensitivity at 1 kHz, 1V Output
  40 dB: 9 mV for 1.0 Volt output
  50 dB: 3 mV for 1.0 Volt output
  60 dB: 0.9 mV for 1.0 Volt output
• Total Gain
  40 dB / 50 dB / 60 dB (unbalanced output)
  46 dB / 56 dB / 66 dB (balanced output)
• XLR Pin Identification
  1 = Ground (Shield)
  2 = Positive
  3 = Negative (Return)
• AC Power Requirement
  Standby: <1 watt
  Power On: 9 watts
  115 VAC or 230 VAC 50 – 60 Hz
• Dimensions
  Width: 17-1/4” (437mm)
  Depth: 14-3/4” (375mm)
• Depth with cables: 17” (432mm)
  Height: 2-1/2” (63.5mm)
  Height, without feet: 1-3/4” (45mm)
• Weight
  Net: 13 lbs. (5.9 Kg)
  Shipping: 19 lbs. (8.6 kg)