Parasound Introduces New Phono Preamp


By RS Staff December 15,2010


Parasound is now shipping the first production samples of its John Curl-designed Halo JC 3 phono preamplifier. As Parasound's chief amplifier circuit designer, Curl has helped create dozens of the company's products. Nearly 20 years ago he also designed the Vendetta Research SCP2B.

Parasound preamp 


The new Parasound Halo JC 3 is a high-performance dual-mono phono preamplifier. Like all phono preamplifiers, the JC 3 must multiply the tiny audio signal generated by a high-end low-output moving coil or moving magnet phonograph cartridge and make it strong enough to deliver to the input of a line-level preamplifier. However, because phono signal levels are so weak, the slightest bit of noise and distortion in the system can easily compromise the musical experience.

"After working with John Curl and circuit board designer Carl Thompson, we are convinced that one of the most important elements of phono preamp design is to use the smallest possible amplifier circuit with the least amount of copper to act as an antenna for noise," said Parasound's president and founder, Richard Schram. "Indeed, the actual phono gain circuits are relatively small within the JC 3's 18 lb chassis.”

To keep the background “black and silent” Schram insisted on housing each channel in its own extruded aluminum enclosure, each further isolated from the power supply with 3/8-inch thick low-carbon mild steel partitions. All parts are top-quality with Vishay-Dale resistors used exclusively and REL capacitors in critical circuits.

"This project has taken several years," Schram continued, "but after listening to the end result it was worth every minute. Curl's Vendetta was so good that it was almost magical, but each one was essentially hand made, and would probably cost over $8,000 to build today. Now, Parasound has a new design that draws from the same creative genius while offering amazingly high performance from each piece we produce."

The Parasound Halo JC 3 is a dual mono design with unbalanced inputs and outputs using Vampire RCA jacks, plus balanced outputs using Neutrik XLR jacks. A custom-made three-position input impedance switch provides for 47 k ohm MM cartridges, 100 ohm MC cartridges, and 47 k ohm MC. The latter is an ideal load for some MC cartridges and high-end moving iron cartridges.

The direct-coupled amplification circuits use DC servos rather than coupling caps. FET followers on each channel's board are used to further isolate the circuits from the voltage regulators in the power supplies.

The JC 3 uses dual mono power supplies with an R-core rather than a toroidal transformer, since toroids have very high capacitive coupling between their primary and secondary which enables noise on the AC line to pass into the power supply and ultimately into the phono gain stages. To further assure immunity from noise on the AC line the JC 3 includes a built-in AC line conditioner.

The Parasound Halo JC 3 is now available with a suggested retail price of $2,350.

2 Comments

  • avatar

    No. it's P-h-o-n-o... Jax from http://www.switchplatecoverssite.com http://www.tealbridesmaiddressesinfo.com http://www.thighhighsocksguide.com http://www.touchscreenlaptopguide.com

  • avatar

    It's Phono not phone

Add Comment

Text Only 2000 character limit
Enter the word as it is shown in the box below: (Why?) (case sensitive)
3 Reasons Local Business Will Prevail in Today’s Marketplace
Read More»
Business Lessons Learned from the ‘Bad Times’
Read More»
What I’ve Learned After Six Months of Owning My Company
Read More»
A CEDIA EXPO Game Plan for the Middle Market
Read More»
Looking at Your Billing Process Through the Client’s Eyes
Read More»

CEDIA Awards Ceremony 2012
Wisdom Audio Factory Tour
Unexpected Atlanta
Triad DesignerSeries Step-by-Step Install
Top 10 Things to See at CEDIA 2010

+ All Slide Shows
along with FIFA farmers sausage and bacon
Read More»
along with FIFA farmers sausage and bacon
Read More»
I only have to have look fifa 14 coins online cheap ahead
Read More»
Re: The Oscars Inspired Me to See More Movies...
Read More»
Re: Is this the end of the Sooloos name?
Read More»
For your squad: looking for a way to buy Cheap Fifa 14 coins
Read More»
For your squad: order Cheap Fifa 14 coinswith cc no paypal
Read More»
Re: best surveillance cameras
Read More»
should only incidentally (whenever) employ heel contact
Read More»
freedom from bondage and solitary confinement
Read More»