2. amps-preamps
  3. 1216693488

New Rowland Criterion 2-chassis battery pre

Jeff Rowland Design has just created a page for its upcoming statement-level, twin chassis, battery powered full function preamplifier. Detail is still scant, but a little bit of info is already available, in addition to front and rear view pics. Here’s the page:
http://jeffrowland.com/Criterion.htm
And here’s the front view:
http://jeffrowland.com/Criterion-front.htm
And here’s the rear view:
http://jeffrowland.com/Criterion-back.htm

You will find a few specs already on the site. JRDG should be publishing more info in the next few weeks. I will post here as I receive it. in addition to the published specs that you can read on the page above, here are a very few additional tidbits that I have learned this far:

. Uses Burr Brown TI OPA1632 high speed fully differentially balanced modules.
. Includes phono stage.
. Uses standard NiMH D-cell batteries available in most electronics stores, loaded in 2 rear-inserted tubes of power supply chassis.
. Capable of AC/DC operation . . . will recharge batteries on independent circuit during AC operation.
. Full remote control
. Target price $18K (not sure yet)
. Availability: probably early Fall 2008.
. Will be featured at RMAF in Soundings Hifi suite Marriott 503 or 505 from Oct 10th to 12th in Denver.

And sorry folks, I have not heard this device yet. Nor I have any good third party reports on its sound. Any speculations on Sonics from my part would be just. . . pure speculations. I’ll keep everyone posted as I learn more.

Guido
guidocorona
guidocorona OP
4,298 posts
 
Splendid idea Dave. It may be worth while you creating a separate thread to locate a Dartzeel user in the Denver general area who would be interested in contributing his unit to perform the Criterion/Dartzeel listening session.

Problem is that not all Dartzeel owners may be following this Criterion thread. G.
mikelavigne
2,199 posts
 
Guido, the whole 'zeel' interface involves not only the cables but an engineered 50 ohm interface input and output. so simply having BNC plugs would not be sufficient.

i have no idea how much effort it might require to design and build that 50 ohm interface; it may be real simple. regarding Playback Design when they were putting the final piece together i recommended that they include the 50 ohm interface, and thankfully they did.

i saved enough money on interconnects in my system to pay for a good amount of the cost of the dart preamp (8 meter set of Nordost Valhalla XLR's just between pre and amp).

btw; when i was listing the attributes of the 'zeel' BNC interface i neglected to mention that BNC plugs have a better and more reliable mechanical connection than other interconnect plug types. obviously the TV broadcast industry uses BNC for video.
guidocorona OP
4,298 posts
 
Mike, yes I read the DarTzeal site and saw the 50Ohm impedance characteristics of the DarTzeel BNC interface. I have no idea if it can be added to Criterion post FSC, or what engineering work its addition may involve. G.
kawika
57 posts
 
Dave, when do you think you might be able to get to Soundings for the Pre amp comparissons? Should be VERY interesting as Jeff R. has designed that thing to be as close to standard impedances everywhere in and out so as to have minimal effect of other components up and downstream. I'd love to hear it on a big tube amp(s):})
dcstep
1,518 posts
 
Sorry Kawika, but it'll be late November most likely. I was out of town until yesterday and I've got tons of catching up to do at work, with a few "events" coming up in the next few weeks.

Dave
More to discover