Parasound JC3 JR phono preamplifier

Parasound JC3 JR phono preamplifier for MM and moving coil cartridges, 1U

Parasound JC3 JR features

• 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 toroidal 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

Parasound JC3 JR Technical details

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 shortened, unweighted

Signal to noise ratio, 50 dB setting
>89dB, input shorted, IHF A-weighted
>84dB, input shortened unweighted

Signal to noise ratio, 60 dB setting
> 94dB, input shorted, IHF A-weighted
> 91dB, input shortened, unweighted

Inter-channel crosstalk
>80 dB at 1 kHz

Input impedance
MM or MI: 47k Ω
MC Variable: 50-550Ω

Output impedance
Unbalanced: <100Ω
Balanced: < 100 Ω per leg

Input sensitivity at 1 kHz, 4mV input
40dB: 4mV 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 Requirements
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. (5.9kg)
Shipping: 19 lbs. (8.6kg)