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Old 24th October 2004, 10:00 PM   #1
Cobra2 is offline Cobra2  Norway
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Default Sony CDP-X779ES

Finally, one is heading my way...
And since a search did not get much results; please give me some upgrade suggestions!

For "integrated" use, op-amps & blocking-caps are obvious.
But what about clock(s)? Witch is most important?
For 1) audio out use? 2) digital out use?
Would maybe a Tent clock with "feedback" be usable here?
(guess not, frequencies does not add up)?

Arne K

P.S.: My Teac VRDS-10 is up for trade / sale...incl.new laser.
(and another new as spare!(KSS-151A). -looking for new KSS-272A )
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Old 10th November 2004, 06:26 PM   #2
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Default Work have started

-but I need some help...
On the audio-board, after the DAC, signal goes to op-amp IC402/502.
On schematics it says "DE-EMPHASIS" on these, and there is no switch....so is the signal filtered for de-emphasis all the time?
Should I remove/modify/bypass the filter?

Arne K
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Old 10th November 2004, 08:47 PM   #3
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Hi Arne, I will look it up tomorrow, with a clear head
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Old 10th November 2004, 09:08 PM   #4
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Default Thanks ELSO !

Another thing I also noticed...the difference in signal-path; the filtering & buffering of the RCA signal vs the less treated balanced signal...

Arne K
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Old 11th November 2004, 06:53 PM   #5
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Default Sony CDP-X779ES

Hi Arne,
That whiskey was not a good idea........
I have a look at the schematic. Deemphasis is simply wrong, should be IV-converter for IC402 & 502.
Balanced out takes a separate route after these IC's.
If you are using the player only as a transport the 16.9344 MHz clock is only important. Digital out will even work with the 45.1584MHz clock disabled if you install a 16.9344 clock.
The 45.1584MHz clock is needed for the Sigma-Delta DAC. When using the player integrated you run across the two clock problem as these two clocks need to be synchronised.
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Old 13th November 2004, 01:51 PM   #6
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Default Re: Work have started

Quote:
Originally posted by Cobra2

On schematics it says "DE-EMPHASIS" on these, and there is no switch....so is the signal filtered for de-emphasis all the time?
Hi Cobra

Sometimes the switching is done by a Fet or transistor and not by a switch...
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Old 13th November 2004, 06:16 PM   #7
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Default Switching

This time it is a error in the schematics...!

Another error; the balanced output is wrong (+/-)(swapped).

Try also dis-connecting the digital out wiring...it makes a change in sound !???!

I also noticed that the internals are quite warm..a few vent-holes would help!

Arne K
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Old 13th November 2004, 08:59 PM   #8
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Lightbulb Re: Re: deemphasis

Quote:
Originally posted by Tube_Dude


Hi Cobra

Sometimes the switching is done by a Fet or transistor and not by a switch...
Deemphasis is done in the digital filter in this Sony model.

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Old 13th November 2004, 11:35 PM   #9
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Quote:
Try also dis-connecting the digital out wiring...it makes a change in sound !???!
I added a coax out on my Sony CDP-295, if analog is plugged in it at the same time as a coax receiver, the SPDIF signal starts sounding like crap, but if I use my DIY coax 2 mini-optical plug, the signal is OK.
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Old 13th November 2004, 11:58 PM   #10
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Default Digital...

DragonMaster,
I ment the internal wire, (it's separate, to a "digital-pcb" in my player).

But it will probably always be best leaving out the wiring you do not use...?

Have just "updatet" a X202ES, new op-amps, a few caps, some damping & weight. It has one of the same Dac-chips as the 779, and does sound allright now.

Arne K
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