New version of Parasound Halo JC3 phono preamp -- JC3+

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  • Burke Strickland
    Moderator
    • Sep 2001
    • 3161

    New version of Parasound Halo JC3 phono preamp -- JC3+

    Parasound has introduced an improved version of the highly regarded JC3 phono preamplifier, the John Curl designed JC3+.

    Press Release:


    Parasound Introduces the Halo JC 3+ phono preamp — An improved JC 3 from legendary Vendetta designer, John Curl.



    The Parasound Halo JC 3+ phono preamplifier is available in silver or black.

    SAN FRANCISCO, 12/12/13 — Parasound, a leading manufacturer of high-end audio electronics, has introduced an improved version of its Halo JC 3 phono preamplifier. The new Halo JC 3+ adds independent load adjustment for moving coil cartridges, as well as enhancements to the dual-mono phono module circuit boards, and increased power supply capabilities. The JC 3+ circuit comes from the designer of the legendary Vendetta phono preamp, John Curl.

    "Six years ago we asked John Curl if he would create a reasonably priced Parasound Halo phono preamp with ultra low noise, in the spirit of his masterpiece, the Vendetta," said Richard Schram, the founder of Parasound. "Three years later we introduced the remarkable Parasound Halo JC 3 which has earned rave reviews from the audiophile press and a legion of vinyl enthusiasts."

    During the design phase of the JC 3, Curl had rejected variable load adjustment because, compared with fixed resistors, potentiometers generally have higher intrinsic self-noise, which is an anathema to creation of an ultra-low noise phono stage. Curl prevailed (he always does), and the JC 3 was built with limited switched input load impedance choices. This decision disappointed some vinyl enthusiasts and reviewers who consider input load fine-tuning to be essential for certain cartridges.

    Curl and circuit board designer Carl Thompson eventually consented to including variable load impedance adjustments, but with these caveats for the potentiometers: 1) They must comply with stringent performance requirements. 2) They must be manufactured by Vishay, a highly-regarded manufacturer of low-noise electronic parts. At that time Vishay did not offer a potentiometer that met these specific requirements. However they recognized an opportunity, and eventually agreed to develop the part and manufacture it in small quantities for Parasound. The outcome of this effort is the Parasound Halo JC 3+.

    Naturally, the JC 3+ features independent variable MC load fine adjustment capability for each channel from 50-550 ohms using these special low-noise dual-gang potentiometers.

    Parasound also took the opportunity to make additional performance improvements. Curl narrowed the spectrum of Johnson/Nyquist noise in the resistor that loads the input stage to maximize its low noise capabilities. Circuit-board designer Carl Thompson tweaked the phono module board layouts to further optimize every performance parameter. The copper circuit board traces in the phono modules are now 24 karat gold-plated where each part is soldered to provide unprecedented transparency and musical detail.

    The MC signal to noise ratio is improved from 75dB to 87dB, A-weighted. MM gain has been increased slightly from 47dB to 48dB, while MC gain has been lowered from 68dB to 64dB so extra-high output MC cartridges won't cause the JC 3+ to overload the inputs of some line stage preamps.

    "Where the JC 3 background was utterly 'black,' the JC 3+ black is, well, blacker." notes Schram. "While these may seem like small details, the JC 3 is already an incredible performer and Parasound is going for that little bit more in the JC 3+."

    The JC 3+ power supply has also been significantly upgraded with 47 percent larger low-ESD power supply filter capacitors. This provides much greater current reserves for head-snapping dynamics. A new R-core power transformer is 82 percent larger to provide greater reserves for low-end impact that's beyond imagination.

    Finally, at the suggestion of a few JC 3 customers, the company has added a simple on/off switch for the front panel P logo illumination.

    The Parasound Halo JC 3+ will be available in late December in both silver and black finishes, and have a suggested retail price of $2,850.

    About Parasound: Founded in 1981, Parasound Products, Inc., is a privately owned U.S. company that specializes in providing affordable audio components to the critical listener. Parasound's products are available from quality audio/video retailers, and select custom installation specialists. For more information, visit www.parasound.com or call 415-397-7100.

    What you DON'T say may be held against you...
  • r100gs
    Senior Member
    • May 2005
    • 321

    #2
    That's good news for the MC crowd. Thanks for the info Burke.
    Jay

    Comment

    • Chris D
      Moderator Emeritus
      • Dec 2000
      • 16877

      #3
      whoa, nice...
      CHRIS

      Well, we're safe for now. Thank goodness we're in a bowling alley.
      - Pleasantville

      Comment

      • blownrx7
        Member
        • Dec 2004
        • 96

        #4
        Anyone seen rear/internal photos of this?

        Comment

        • Chris D
          Moderator Emeritus
          • Dec 2000
          • 16877

          #5
          Here ya go, dude. From the same press release:










          CHRIS

          Well, we're safe for now. Thank goodness we're in a bowling alley.
          - Pleasantville

          Comment

          • blownrx7
            Member
            • Dec 2004
            • 96

            #6
            Thanks!
            "The JC 3+ power supply has also been significantly upgraded with 47 percent larger low-ESD power supply filter capacitors. This provides much greater current reserves for head-snapping dynamics. A new R-core power transformer is 82 percent larger to provide greater reserves for low-end impact that's beyond imagination."

            It's one thing to read the size/capacity increases. It is quite another to see it in pictures. Impressive!
            I could see purists wanting to go in and bypasss the pot and put in their preferred resistor value.
            Next iteration I would love to see a two-input version. It would probably price it right out of the ballpark but I can dream...

            Comment

            • WAFWARRIOR
              Junior Member
              • Apr 2013
              • 6

              #7
              Jc3+

              Originally posted by blownrx7
              Thanks!
              "The JC 3+ power supply has also been significantly upgraded with 47 percent larger low-ESD power supply filter capacitors. This provides much greater current reserves for head-snapping dynamics. A new R-core power transformer is 82 percent larger to provide greater reserves for low-end impact that's beyond imagination."

              It's one thing to read the size/capacity increases. It is quite another to see it in pictures. Impressive!
              I could see purists wanting to go in and bypasss the pot and put in their preferred resistor value.
              Next iteration I would love to see a two-input version. It would probably price it right out of the ballpark but I can dream...
              I will mention that 2 input idea to Richard and pals. Though chances are that the JC3+ will not see any changes for a few years at least if at all. These are quite pretty on the inside and the photos don't do them justice IMO.

              Comment

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