Main Line Sound & Video

610-687-3555

Halo by Parasound® Phono Preamplifier

At a Glance

The JC 3 Jr. is John Curl's ultimate value-engineered phono preamplifier. John Curl has designed acclaimed phono stage preamps for Vendetta research, Constellation Audio, Audible Illusions and for Parasound, whose JC 3+ is a Stereophile Class A Recommended Component. The JC 3 Jr. is his most affordable...ever.

Proposition 65 Warning for California Residents

Circuitry designed by legendary John Curl

Circuit board layout by Carl Thompson

Cartridge options for 47k O 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)

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 O

MC Variable: 50- 550 O

Output Impedance

Unbalanced: < 100 O

Balanced: < 100 O per leg

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

115 VAC or 230 VAC 50 - 60 H

Dimensions

Depth without cables: 14.75

Height without feet: 1.75