Marantz CD-7 audio output mod. - Page 2 - diyAudio
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Old 19th January 2006, 03:28 PM   #11
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I started the modding!
I removed two caps in the rca output line, c604 and c605 and put a Dayton MKP 7,5F in on one side. When set to mono I can already hear a big difference in clarity and detail.

I tried rca first, not to fry my true balanced part of my cd-7.

Now for my question:
There is no dc component in the rca output line.
But as I already mentioned I measured 0,431 Volt DC over the two 220F el.caps. Does this DC definitely need to be removed? Or does it serve a purpose in the true balanced design?
I calculated for f3 with 76,7Kohm a value of 0,22F.
This is handy because I have some very nice paper/oil caps NOS from Westcap laying around.

Will this provide any problems? Changing the two 220F el.caps for this one 0,22F paper in oil?
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Old 19th January 2006, 04:01 PM   #12
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Paper in oil caps in a CD7 !?

Nothing is sacred.
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Old 19th January 2006, 04:04 PM   #13
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Remember that the formulas output is the -3 dB point. So the frequency rolloff is starting earlier.

0.22 uF seems inappropriate, from calculation and from experience.

The 0,431 Volt DC over the two 220F el.caps does need to be removed. If they could have been left out, Marantz would have done that wouldn't you think ?
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Old 19th January 2006, 04:17 PM   #14
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Sure, I agree.
But will say 1F remove this also?
Isn't the 2x220F intended for worst case when some hooks up an amp with very low impedance?
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Old 19th January 2006, 04:19 PM   #15
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PS 1 cap gives a rolloff of 6dB/octaaf isn't it?
So when I have 9Hz -3dB then roloff should commence @ 18-4,5Hz = 13,5Hz. I have no problem with this rolloff. Or do you find 0,22F to low a value in other respect?

I will not kill the cd player by putting in this value, would you reckon?
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Old 19th January 2006, 04:37 PM   #16
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Leave it like it is after you've soldered both Dayton caps as you seem unsure. CD7 is already a great cdplayer in its current setup and after adding a low jitter clock probably only the last 5% in improving its sound quality is left.

Please practise modding and changing cap values on a budget cdplayer which is not a big loss if you make a mistake. If you are unsure and do not know the basics in electronics ( no offence intended ) you better start gathering knowledge on a basic cdplayer. You will learn from your mistakes and you'll be able to mod the CD7 the right way when you're more experienced.
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Old 19th January 2006, 04:46 PM   #17
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I use the XLR not the rca.

How is one to learn if the knowledgable aren't willing to help.
I already practiced on the Denon 2900 with great results.

My only question is, if there is a specific reason for the 2x220 in the balanced output? And if replacing these with a lower non-polar version, say 1 F, will they not function in this setup.
I know it will in the rca line, but will it be sufficient to kill the dc component of 0,431 volt?

No book will tell me, you guys can. Because you now a lot in this specific department.

Or is everybody dodging the answer, thinking I will curse you for it when I blow it?
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Old 19th January 2006, 04:47 PM   #18
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Quote:
Originally posted by D.A.R.R.Y.L.

How is one to learn if the knowledgable aren't willing to help.
I beg your pardon ?
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Old 19th January 2006, 04:50 PM   #19
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Sorry,

Did I offend you? Didn't mean to.

I mean that I know my basics and already modded the denon 2900 to great avail. Not being to familiar with true balanced designs, I was only inquiring about this high voltage component and it's 'possible use' in this design.

That's all.
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Old 19th January 2006, 05:05 PM   #20
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Quote:
Originally posted by D.A.R.R.Y.L.
I use the XLR not the rca.

How is one to learn if the knowledgable aren't willing to help.
I already practiced on the Denon 2900 with great results.

My only question is, if there is a specific reason for the 2x220 in the balanced output? And if replacing these with a lower non-polar version, say 1 F, will they not function in this setup.
I know it will in the rca line, but will it be sufficient to kill the dc component of 0,431 volt?

No book will tell me, you guys can. Because you now a lot in this specific department.

Or is everybody dodging the answer, thinking I will curse you for it when I blow it?
There is a trend for using large caps in output coupling but they are not always neccessary. Depending on the input of your preamp, even 1uF may work well. The size of the cap has nothing to do with the offset value, any cap will block offset.

If you want to try 1uF go ahead and see if it sounds well, if it doesn't, try something else.

In my DAC I'm using 0.1uF V-Cap for output coupling and the bass performance is very good (the preamp's input has at least 100k impedance).
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