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Old 31st March 2003, 05:58 AM   #1
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Default Newbie Tweeking

I've been trying to follow the various threads on this forum and have gleaned some useful info. I do see, however, a lot of general references to tweaking various transports without much explination of what and why.

I recently picked up a Marantz CD6000OSE on eBay at good price and I am wondering what tweaks might be useful. I am thinking of a Scott Nixon DAC but am not sure what other steps I should take.

I would say, without trying to be too bombastic that I am fairly adept with technical subjects, having been involved in all sorts of electronic/computer systems, including board level repair and engineering for the past 30 years.

But I don't want to tear into this thing (even at the price I paid) without some clearer direction.

Also, are schematics available for the Marantz... Gee, remember when you could go to your local repair shop and get a Photofacts on anything that ran electrons? Or am I dating myself?

Sorry for the long post...
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Old 31st March 2003, 10:01 AM   #2
Zombie is online now Zombie  Sweden
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Two simple reversible tweaks:
- stuff it with bitumen everywhere inside,
- put bluetac where possible in the transport (not too much, though)
Good luck
Tom
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Old 1st April 2003, 06:01 AM   #3
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Tom,

Thanks for the quick reply. I presume these tweeks are to damp down physical vibrations. I am not sure how useful that would be considering the (major) street outside my building is rougher then any in Bagdad and anytime a truck decided to plow through the holes it's as if the building was hit by an earthquake.

I will still try some damping but I am also interested in some electronic tweeks. Over 50 hits and only you were kind enough to respond. How does one get things going, start another thread on what CD player/Caps/resistors/DAC to use/buy/build?

So many knowledgeable people out there and I can't land more then one kind soul...
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Old 1st April 2003, 06:27 AM   #4
Zombie is online now Zombie  Sweden
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Hello!
Did you do a search? Think there has been some threads about CD6000 earlier.
Also, there are some general tweaks that might apply to the CD6000, too.
There's a lot about the CD63, but I don't know how applicable these might be.
It would be of help if you have a service manual to your player.
General tweaks:
1) shortcut the output caps if they are of lower quality. Measure the DC before the caps, BEFORE you shortcut. A value of <50mV is OK
2) check what opamps you have and change them for better ones, put good sockets in, then you can try different opamps
3) if changing the opamps, put bypass caps of 0,1uF from the +/- voltage legs to ground as close as possible to the chip
4) as I said before, stuff it with bitumen and bluetac, even more important when you have vibrations in your house. Bitumen and bluetac is cheap and you can easily remove it
5) clean up the power supply by using better regulators and separating the supply to the analogue and digital sections
6) put in a new clock, look for the Kwak-clock, it's a cheap and good alternative constructed by a guy at the forum (alhough I haven't tried it myself - yet)

Specific Marantz tweaks:
1) IF the first opamp after the DAC uses a differential input, it would be a good idea to match the components around that opamp within 0,1% tolerance. Made a great difference on my CD63 - as great as the clock change and output cap shorting

Hope this is enough. I believe you will find a lot of details concerning most (all?) of these tweaks if you do a search on the forum.
Good luck!
Tom
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Old 1st April 2003, 12:07 PM   #5
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Default The offset...that is offset...

Quote:
shortcut the output caps if they are of lower quality. Measure the DC before the caps, BEFORE you shortcut. A value of <50mV is OK
50mV is OK for a power amp...but not to a source component...

Imagine the normal voltage gain in a power amp (30 x)...
50mV x 30= 1.500 mV=1,5Volts of of set!!!

Poor woofer!!
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Old 2nd April 2003, 04:49 AM   #6
Zombie is online now Zombie  Sweden
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Hello!
So, the 1,5V signal output form the CD becomes 30 x 1,5V = 45V.
Poor speaker.
Usually there's a cap on the input on every component, isn't there?
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Old 2nd April 2003, 06:00 AM   #7
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Tom,

Thanks for the reply again! I did do a search but mostly got discouraged as the threads degenerated into personal attacks over whose Op Amp was better, etc.

I really don't have patience for the high THD in many of those threads. I like good practical advice and pointers. I am willing to try most things if they make sense.

I tried to find a schematic for the CD-6000 but the one thread with a link didn't work. Any clues where to pursue one?

As to your specific ideas (thanks!!! ) what do you mean by "shortcut the caps?" Do you mean to short them out, as in remove them? Ah, yes, hence the concern about the ripple...

I'll go through the forums again to see if I can glean some useful stuff in all the noise.

I do appreciate your patience and help!

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Old 2nd April 2003, 06:34 AM   #8
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Old 2nd April 2003, 06:37 AM   #9
Zombie is online now Zombie  Sweden
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Hello!
Too bad you can't find anything relevant for the CD6000.
I find this thread very useful, indeed.
You just have to "filter" stuff out. You might also try to contact "garmin", he's the guy with the Polish site. Maybe he can give you more extracted, compact tips.
As I said I can give you loads of links to CD63 mods, but I can't determine how relevant they are.
Ergo has suggested that you bypass the second opamp and shortcut the HDAM, but use the last FETs of the HDAM to drive the output. Haven't tried that one, though.
Look at www.audioasylum.com, too. But I must say that the most compentent and friendly advice you'll get here (not saying that I am terribly compentent)

Try to find the Schematic It's under the word "tutaj"

It's better to shortcut the caps with a bit of thick wire. The concern with the caps is that they block DC that can potentially harm your speakers. If you feel uncomfortable with that risk, put in Black Gates.
If you balance the 10, 27k resistors at the first opamp after the DAC, not only the sound will improve, the DC offset will go to almost zero.
Of the mods I have made, these made the biggest audible sound difference:
- output caps shorting
- getting the 10 and 27k resistors at the first opamp after the DAC into 0,1% tolerance
- LCAudio clock
- separate regulators for the DAC digital, analogue and oscillator parts
IMHO, no need to get at the opamps, if you don't want to.
Good luck!
tom
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Old 2nd April 2003, 08:58 AM   #10
Paulr is offline Paulr  United Kingdom
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Default Tweaks

Have a look at the 723/753 Philips thread, these are the same as Marantz 4000 & 5000, although different machines the theory referred to by Nuuk in post #63 may be what you're looking for:

http://www.cfmedia.org/mods.pdf

Also even though it does go off topic being a valve mod, this may help. It notes some of the differences between the 6000 & 5000 models:

http://www.heartaudio.nl/enter.html?...rt_CD6000.html

Cheers

Paul
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