Marantz CD63 & CD67 mods list - Page 903 - diyAudio
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Old 9th February 2008, 05:00 PM   #9021
Thomo is offline Thomo  United Kingdom
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If that screechy Led Zep voice is from the re-mastered series cd's then that's how they are. I've found the sound quality off those discs is not that great. It may be that the components are now showing up bad recordings.

I reckon a really good reg on dac analog and those other mods you have planned will help fill out the bass, add more detail and even up the sound.

Lee.
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Old 9th February 2008, 06:15 PM   #9022
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by Thomo
If that screechy Led Zep voice is from the re-mastered series cd's then that's how they are. I've found the sound quality off those discs is not that great. It may be that the components are now showing up bad recordings.

I reckon a really good reg on dac analog and those other mods you have planned will help fill out the bass, add more detail and even up the sound.

Hi Lee

So I trust the micas are ok ?

I already have a sreg on the dac analog... Do you believe I could have better bass if I install another one on the dac clock ?

While I do not get a good clock I will try a modified version of the acoustica.org:
1- Eliminate the ground loop by cutting trace between CD02 and pin 2
2- Improve filtering by replacing CD05 by a 407uF 10v OsCon bypassed by a 100n Metal Film (I do not dare to solder something near the dac pins 2 and 27).

Can I expect improvements ?

Regards

Ricardo
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Old 9th February 2008, 06:34 PM   #9023
Thomo is offline Thomo  United Kingdom
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Quote:
Originally posted by RCruz

Hi Lee

So I trust the micas are ok ?

I already have a sreg on the dac analog... Do you believe I could have better bass if I install another one on the dac clock ?

While I do not get a good clock I will try a modified version of the acoustica.org:
1- Eliminate the ground loop by cutting trace between CD02 and pin 2
2- Improve filtering by replacing CD05 by a 407uF 10v OsCon bypassed by a 100n Metal Film (I do not dare to solder something near the dac pins 2 and 27).

Can I expect improvements ?

Regards

Ricardo

Hi Ricardo. The Silver Mica's are great caps and the Acoustica mods do bring improvements but a new clock is far better. Also, I personally don't bypass Oscons, ZA's etc.

Does anyone know if the TDA1302t hf amp in my cd67 draws much current? I am going to install a tx to power it with a couple of 5v regs and space is short so I want to use as small a tx as possible 2 x 0.077A, will this be enough? The datasheet says the laser output current is 100mA, does this mean the tx is not enough?

Lee.
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Old 9th February 2008, 10:13 PM   #9024
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by Thomo
I can vouch for Brent's products too. They offer fantastic performance and value for money.

Pic of clock on another cd67 with discrete on the main-board for anyone who's interested.

Click the image to open in full size.

Hi Lee

In your pic, the sreg is used to power +5v digital on the dac ?
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Old 9th February 2008, 10:47 PM   #9025
Thomo is offline Thomo  United Kingdom
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That Raygulator supplies dac analog, the digital supply is just fed from the standard 7805 reg. I just modded this player with cheap parts and to see if i could build the output stage on the original board. I plan to sell it in the very near future.

Lee.
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Old 9th February 2008, 11:01 PM   #9026
RCruz is offline RCruz  Switzerland
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Click the image to open in full size.

I still keep this BIG thing in parallel with C815 (Digital PSU).:hot:
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Old 9th February 2008, 11:03 PM   #9027
RCruz is offline RCruz  Switzerland
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Click the image to open in full size.

As is actually.
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Old 10th February 2008, 02:22 PM   #9028
Thomo is offline Thomo  United Kingdom
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Just thought I'd post an update of where I am after just finishing my last (until I think of something else) round of updates.

I've just moved the Invisus onto the dac digital, and have added two regs for the hf board under the laser assy; one for the laser supply and one for the hf amp. Each is supplied by it's own winding taken from the 67OSE tx using the windings originally used for the opamps.

Click the image to open in full size. Click the image to open in full size.

The small elco's near the tda1302 are BG nx hi-q's. The sound is now much more open, with more detail and space around instruments. Lurrvelly.

Cheers, Lee.
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Old 10th February 2008, 05:14 PM   #9029
RCruz is offline RCruz  Switzerland
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HELP

I just did acoustica.org mod by cutting the trace between pin 2 and CD02 solder pad.

As the player was open I also out some ferrites in the inductors around TDA1301 and the R149 150.

Now the player does not play....

It reads the disc... sometimes stabilizes in one track but never goes mere than 2 seconds and stops.

No sound comes from the output.

What could be the cause for this behaviour ?

Really need help.

Regards

Ricardo
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Old 10th February 2008, 07:54 PM   #9030
RCruz is offline RCruz  Switzerland
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BIG DISTRESS

Q106 (Focus and radial driver ) is getting really hot... too hot to touch.... is that normal ?


The CD53 just spins the disc.... than informs the number of tracks... thatn stops.. does not read the tracks

Please Help

Ricardo
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