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- Newsgroups: rec.audio
- Path: sparky!uunet!caen!batcomputer!theory.TC.Cornell.EDU!eacj
- From: eacj@theory.TC.Cornell.EDU (Julian Vrieslander)
- Subject: Sony CDP-X339ES CD player: might be a good base for "poogery"
- Message-ID: <1992Jul30.030557.24311@tc.cornell.edu>
- Sender: news@tc.cornell.edu
- Nntp-Posting-Host: theory.tc.cornell.edu
- Organization: Cornell Theory Center
- Date: Thu, 30 Jul 1992 03:05:57 GMT
- Lines: 53
-
- I've obtained some worthwhile improvements to the sound of my Philips CD-680
- CD player, by installing some of the usual parts upgrades (better op amps
- and capacitors). Now I am thinking about donating this unit to my parents,
- and replacing it with a player using one of the newer convertor technologies.
-
- One product that seems attractive is the new Sony CDP-X339ES. This unit has
- been reviewed in a couple of magazines, with superb bench results and
- favorable subjective ratings. The build quality, user interface, and styling
- are clearly superior to my Philips.
-
- Inside, I found a rugged looking transport and a single fairly beefy
- transformer. There are three compartments, separated by shielding walls, for
- the transport, display/control, and digital filter/DAC/analog output
- sub-assemblies. The filter/DAC/analog circuitry resides on a large
- symmetrical PCB, with a copper fence (ground bus) running down the center of
- the board. The PCB has analog ICs on its top side, and the DAC and digital
- filter chips (surface mount packages) soldered to the bottom side. With a
- multilayer PCB, this arrangement might improve the isolation of digital
- noise from the analog signals. Unlike my Philips, the analog board in the
- Sony has decent separation between parts, and is easily accessible. If I
- felt the urge to do some parts tweaking, it would be quite easy.
-
- Some of the parts appear to be standard consumer grade: JRC 5532 op-amps are
- used for the outputs, and 7812/7912 regulators are used for the analog
- supplies (separate IC regulators are used for the transport/control board).
- There are generously sized electrolytics for the power supplies, and the
- output coupling caps are bypassed with film caps. There are quite a few
- Roederstein film caps, apparently used as local bypasses.
-
- Perhaps someone can help me identify a couple of the other chips. There are
- some JRC 4556D (or maybe they are 45560) chips in 8-pin DIP packages, and
- some other 8-pin DIPs marked as 5238 with a tiny logo that looks like
- Mitsubishi's. I cannot find these part numbers in any of my cross-reference
- lists. And does anyone know who makes the electrolytics in brown wrap, with
- AVF and AWF markings?
-
- I have the CDP-X339ES home for audition now, and the sound quality of the
- stock unit compares well with my modified Philips. The Sony puts up a
- somewhat deeper image, and sounds a bit smoother and laid back in the highs.
- The Philips shows more control in the bass, and has slightly more emphasis
- of high frequency details. If I keep the Sony, I would find it hard to
- resist yanking those 5532's for some new op amps (I am using OPA2604's in
- the Philips, but I might also try the AD827's that a lot of folks are raving
- about).
-
- I would enjoy sharing ideas with anyone else who has tried modifications to
- Sony players. I am also willing to provide more info on the CDP-X339ES,
- if anyone is interested.
- --
- Julian Vrieslander
- Neurobiology & Behavior, Mudd Hall, Cornell University, Ithaca NY 14853
- INTERNET: eacj@theory.tc.cornell.edu BITNET: eacj@crnlthry
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