clockfrequency Philips DVD 963SA

[Jaap]

Does anyone know the clockfrequency of the 963sa ?

Anyone experience with upgrading this machine ?

regards,

Jaap

[Elso Kwak]

Hi Jaap,
33.8688 MHz is used for SACD, 24.576 MHzfor upsampling and another one for ????

http://www.audiocominternational.com...psdvd963Sa.asp
Will soon know more as I have plans to tweak this model. Hopefully will get a manual too.See also:
http://forum.audiogon.com/cgi-bin/fr...1&openflup&1&4

[Guido Tent]

Hi

The clock architecture of 963 is a mess

The SACD clock stms from a LL chip driven by the clock from the drive (yuck). Furthermore, 2 other crystal clocks are present, and too many gates control all the clocks

I am figuring out how to improve all this. Will keep you updated

best regards

[Elso Kwak]

Originally posted by Guido Tent
Hi

The clock architecture of 963 is a mess

The SACD clock stms from a LL chip driven by the clock from the drive (yuck). Furthermore, 2 other crystal clocks are present, and too many gates control all the clocks

I am figuring out how to improve all this. Will keep you updated

best regards

Guido,
This does not appeal to me as a sound recommandation for this product made by your employer!
LL does mean?
I hold my breath for your update.

[hatasa]

The 33.8688MHz for the SACD/CD DAC... (If I havent get wrong full frequency and half frequency cut off)

The 24.5760MHz for the Upsampling chips...

And there have the 27.000MHz for the DVD encoder chip... at the transport...

You know what still have the 8.4672MHz for the cotroller chip at the bottom of the Transport... but leave it alone!

[Guido Tent]

Originally posted by Elso Kwak

Guido,
This does not appeal to me as a sound recommandation for this product made by your employer!
LL does mean?
I hold my breath for your update.

Hi Elso

Can't help it, I am into DVD +RW product development....

The 963 is a lot of function for money, som decent upgrades on clock and supply wouyd make it a killer, it contains decent opamps and a true AD1955 for the FRONT channels (so forget about normal stereo outputs)

LL should be PLL.....

regards
-
Guido

[Jos v E]

I have done some measurements on the clock circuit of my DVD963....

A high-quality AD1955 audio DA-converter is used for the left and right Front channels. The 'master clock' of this chip (pin 27)
is 16.9MHz for CD-audio playback, 12.28MHz for DVD 5.1 audio, and 11.28MHz for MP3 and SACD playback.
This latter frequency is not generated with a nice crystal oscillator on the audio board, but seems to originate from a PLL circuit at the main driver-and-video board, passing through connectors and selection gates.
A low-jitter clock circuit upgrade should definitely bring audible improvement.

[Bill Lummus]

What op amp does the 963 use for an output stage?

[Guido Tent]

Originally posted by Bill Lummus
What op amp does the 963 use for an output stage?

All channels LM833 (yuck), front channels use AD 8032 (much better), and AD8022 I/V converters, fed by AD1955 DAC (very nice)

figure which channel sounds best.....

regards

[Jaap]

Allen Wright is going to do an upgrade for the 963 (see his website). What do you think ? I believe that his work on the sony machines is outstanding. Perhaps we should have him doing the difficult work ?