upgrades to marantz CD6000 OSE

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#43
Mozfet

Just read this thread twice and I still dont believe it!

rickpt, where have you been the past 20 years? Objective Tests on Audio Equipment will not tell you how it sounds. Now this has been covered so much in the past 20 years in the press that it is just not worth going over again. I have replaced a lot of NE5532 and NE5534 with various devices and all have sounded better, I would urge you to try some of the alternatives suggested, but please dont listen with your THD Meter we have far more discriminating devices that come free at birth.

'There are those that Know, and those that don't Know, and there are those that don't Know they don't Know'

Mozfet 😀
 
#46
Agree with wombat.

First upgrade for these players is a clock, no discussion.

No2 is to clean up the analog stages, but I wouldn´t use the Marantz own as it is. Big board, several opamps, not so good buffers, bad PS and so on.

Might as well do a discrete highend analog stage with dedicated PS. I upgraded a CD63 with LClock and Zapfilter, actually the biggest improvement was with the clock...

.... well both where huge improvements but the clock was a real jaw-dropper... never expected the result that I got.

After this I would play with feets, cables/cords and damping.

/Peter
 
#47
Wombat & Pan,

I should re-phase my question.

I have already carried out numerous upgrades/mods to my cd63 in the power supply and analog stages. I have tried a couple of different op-amps already.

My question is, will the LM6172 work in my player without any further mods or additions to the LM6172 itself?.

Please let me know.

Or if you have any other suggestions for op-amps. I would appreciate it.

Thanks

KevinLee🙂
 
#49
LM6172 is a drop in to this player but I suggest you add at least one important thing - a cap between V+ and V- pins of the opamp.

Marantz's decoupling as is is not quite as good as needed for this fast opamp. Use for exaple as big SMD ceramic cap as you can get and are able to put into the player. I usually install these on top of the opamp.....

Ergo
 
#50
I am going to short out the electrolytic caps (ELNA-s back to back) at the signal output on my CD6000OSE as sugested by ergo. However I don't have the service manual so I would be very gratefull if somebody could confirm that they are 2219, 2221, 2222 and 2220 before I start desoldering.



Thanks and I'll be sure to let you know if there's much of a difference


James
 
#57
Right I've just taken out the caps, and added a bit of blue tac around all supports for the pcb. I think there is a definite improvement in the sound. The only problem now is I get a fairly loud noise through the speakers when I press Stop or Play 🙁

Oh well...life is a compromise I guess. I still think its worth doing though


James
 
#59
Yes its like one loud click every time I start or stop a CD. Unfortunatly I am a newbie at all this and I wouldnt have a clue how to minimize offset. Is it a relativly easy thing to do or is it for people with more advanced skills?


Thanks

James
 
#60
jnxw2 - if you have a DMM (digital multimeter) then with mV-DC measurement range measure the voltage between cd player case and the output RCA center contacts.

The voltage has usually been no more than 10mV on either + or - side. For example the CD17 mkII on my floor that just got the same modification had +0.4mV DC on output pins....

Ergo
 
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