philips cd850 MKII

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#67
Hi, I am new here.

Can anyone direct me to where I can order the orange pulley/gear that controls the opening/closing of the transport tray? I find that part very brittle and my gears lost a couple of teeth due to age/weather.

Any help given is much appreciated.

Thanks.
 
#68
dac out

i this thread i've seen references to taking the output straight from the dac (bypass the opamps).
either to valve or other analogue stage to replace opamps.
I have alredy upgrade my cd850 with LCaudio clock and using opa227's
big difference in sound🙂

I have also my preamp working http://www.diyaudio.com/forums/showthread.php?s=&threadid=50267
awesome preamp
ps thank metalman, pass, henrik and all the others

just a thought
how about using this circuit instead of valves, to replace the opamps?

any suggestions anyone?
 
#69
dac out

i this thread i've seen references to taking the output straight from the dac (bypass the opamps).
either to valve or other analogue stage to replace opamps.
I have alredy upgrade my cd850 with LCaudio clock and using opa227's
big difference in sound🙂

I have also my preamp working http://www.diyaudio.com/forums/showthread.php?s=&threadid=50267
awesome preamp
ps thank metalman, pass, henrik and all the others

just a thought
how about using this circuit instead of valves, to replace the opamps?

any suggestions anyone?
 

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#70
I'm on they way to work on a complete power supply mod for this player. Something with 4-5 new transformers, independant ones for each section.

Based on KWY's advice on the CD723 thread, adapted to this CDM4 machine.

Is anyone interested?
 
#71
4-5 trannies

brocolo,
4 to 5 transformers
is it worth it?

upgrade psu for digital pocessing, ie logic front panel dac control
then any audio process outside box.

eg
i already have LCaudio clock
then instead of using opamps to cleanup audio signal.
run dac output to CC-CCS-X-BZLS external balanced out-in to preamp.
already have rough CC-CCS-X-BZLS preamp running and very good sound.
making decent pcb's for preamp.
can try old pcbs for dac analogue? balanced? just thoght of it today.
will try soon.
 
#73
i agree different psu for digital and analogue
and also different grounds, then to star ground

the cd850 has virtual ground standard
2 pin cord

have you seen the circiut diagram for the cd850?

i'll try balanced out of the dac.
separate analogue stage
 
#75
Bricolo said:
I'm on they way to work on a complete power supply mod for this player. Something with 4-5 new transformers, independant ones for each section.

Based on KWY's advice on the CD723 thread, adapted to this CDM4 machine.

Is anyone interested?
Click to expand...


Hi Bricolo

Yes - I'm interested! This is why I pestered KWY so much in that CD723 thread :smash:

If you read through the thread, you will see that I was trying to adapt his advice to a CD624 - which has CDM4/19, power supplies and main PCB just like your CD62.
 
#77
Bricolo & Fin


i read though that CD723 thread also
some very interesting information.
but with grounding being so important, i have a question

If grounding is so important, these cd players are using 2 pin power cords, being active and nuetral.
so therefore the nuetral is being used as return path(ground)
If so, not a very good earth reference point.
 
#80
I had the 850MKII.

I was going to buy the 850 then it got replaced with the mark II very quickly.

Big differences are the following:

* The old 850 had a weird problem, THD apparently rose to very high levels the lower the output signal was - a faulty filter apparently. It was in a magazine but can't remember which.

* The MKII also had a differential mode bitstream DAC instead of the normal one, IIRC.

I'm going to make all of you go crazy... I actually trashed my 850MKII a few weeks ago... I should have kept it to practice modding skills...
 
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