Marantz CD63 & CD67 mods list - Page 1390

6h5c · 10th January 2010, 08:46 PM

Strange. For all you know, it may have been there all the time but you just didn't notice it. With the muting gone, you can hear everything the player does when it's not playing. The hum changes when the player focuses, so it sounds like the problem is load related. A scope would be real handy to see if there's any excessive ripple on the supply lines. Also the internal ground could still be a cause. When the load currents do not run where they are supposed to, this can generate similar problems. You could do a quick check of the various supply voltages with a DMM, and see if they are not low or sagging. Also, check before the regulators, to see if the voltage doesn't fall below the minimum requirement = output voltage +2.0 to 2.5V. You may even try to measure residual ripple by using the AC function and see if you can detect any abnormal levels on the supplies.

Regards,

Ray

Malefoda · 10th January 2010, 09:57 PM

Ok that's an easy task for next midday!
Thanks Ray,
Matthieu

Malefoda · 11th January 2010, 02:11 PM

All voltages OK, grounds of outputs to DAC's one, the same. Anyway, that's the very same hum as my phono stage and alsmot at the same (far away of music level) level! More than odd...

6h5c · 11th January 2010, 06:01 PM

Are you sure it's coming from the player then?

Ray

Malefoda · 11th January 2010, 07:03 PM

Rien ne m'est sûr que la chose incertaine.
Will lend it to a friend for test and get a full review

thanks guys for the help provided, still have to regulate the drivers before let the bird fly away.
Matthieu

RCruz · 11th January 2010, 09:07 PM

Did you not report (years ago) that you had problems with the mains where you live ?

UV101 · 12th January 2010, 12:12 PM

Quote:

Originally Posted by Malefoda

All voltages OK, grounds of outputs to DAC's one, the same. Anyway, that's the very same hum as my phono stage and alsmot at the same (far away of music level) level! More than odd...

disconnect all the input connections and see if it still does it!

Also, try disconnecting all your kit from the mains and adding back 1 at a time. I had a dodgy transformer in my CDP that was causing problems for my amp!!!

Malefoda · 12th January 2010, 01:17 PM

Yep Ricardo, good memory here

And yes Ian, I'll unplug all and check that.

Thanks fellows,
Matthieu

gy21 · 17th January 2010, 11:13 AM

Hello.

i'm back, just bought a 2nd cd67 mkII this week and would like to modify it slightly, i'm not planning to bring it as far as ny first heavily modified cd67se.

Mod's planned, opamps lm4562, disabling hdam, disabling output caps and transistors, muting circuit.

Just wondering if it is a good idea to re use the output caps's (c655/c658), elna silmic 220uF, around the opamps, replacing then the Elna 100uf (red) (C611/C614).

Can the Elna red's be used somewhere else as well.

Malefoda · 17th January 2010, 11:42 AM

Old Cerafine vs old Silmic, try one channel, maybe better bass?
I won't fit any LM4562 until they have at least clean 317/337 or it may sount boring. Why not a good AD device? My 2cts.

Left red Cerafine may be moved to DAC and Decoder.

10th January 2010, 08:46 PM	#13891
6h5c One Seriously Addicted to Audio and Electronics diyAudio Member Join Date: Apr 2004 Location: Heerhugowaard	Strange. For all you know, it may have been there all the time but you just didn't notice it. With the muting gone, you can hear everything the player does when it's not playing. The hum changes when the player focuses, so it sounds like the problem is load related. A scope would be real handy to see if there's any excessive ripple on the supply lines. Also the internal ground could still be a cause. When the load currents do not run where they are supposed to, this can generate similar problems. You could do a quick check of the various supply voltages with a DMM, and see if they are not low or sagging. Also, check before the regulators, to see if the voltage doesn't fall below the minimum requirement = output voltage +2.0 to 2.5V. You may even try to measure residual ripple by using the AC function and see if you can detect any abnormal levels on the supplies. Regards, Ray __________________ Gonna buy my little girl a pink soldering-iron The new DOS-CFP board is out!

10th January 2010, 09:57 PM	#13892
Malefoda diyAudio Member Join Date: Jun 2006	Ok that's an easy task for next midday! Thanks Ray, Matthieu __________________ Old simple TT, cheap CDP with wise mods, Class T amp at its best: music!

11th January 2010, 02:11 PM	#13893
Malefoda diyAudio Member Join Date: Jun 2006	All voltages OK, grounds of outputs to DAC's one, the same. Anyway, that's the very same hum as my phono stage and alsmot at the same (far away of music level) level! More than odd... __________________ Old simple TT, cheap CDP with wise mods, Class T amp at its best: music!

11th January 2010, 06:01 PM	#13894
6h5c One Seriously Addicted to Audio and Electronics diyAudio Member Join Date: Apr 2004 Location: Heerhugowaard	Are you sure it's coming from the player then? Ray __________________ Gonna buy my little girl a pink soldering-iron The new DOS-CFP board is out!

11th January 2010, 07:03 PM	#13895
Malefoda diyAudio Member Join Date: Jun 2006	Rien ne m'est sûr que la chose incertaine. Will lend it to a friend for test and get a full review thanks guys for the help provided, still have to regulate the drivers before let the bird fly away. Matthieu __________________ Old simple TT, cheap CDP with wise mods, Class T amp at its best: music!


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11th January 2010, 09:07 PM	#13896
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	Did you not report (years ago) that you had problems with the mains where you live ?

12th January 2010, 01:17 PM	#13898
Malefoda diyAudio Member Join Date: Jun 2006	Yep Ricardo, good memory here And yes Ian, I'll unplug all and check that. Thanks fellows, Matthieu __________________ Old simple TT, cheap CDP with wise mods, Class T amp at its best: music!

17th January 2010, 11:13 AM	#13899
gy21 diyAudio Member Join Date: Mar 2006 Location: Drachten	Hello. i'm back, just bought a 2nd cd67 mkII this week and would like to modify it slightly, i'm not planning to bring it as far as ny first heavily modified cd67se. Mod's planned, opamps lm4562, disabling hdam, disabling output caps and transistors, muting circuit. Just wondering if it is a good idea to re use the output caps's (c655/c658), elna silmic 220uF, around the opamps, replacing then the Elna 100uf (red) (C611/C614). Can the Elna red's be used somewhere else as well. __________________ Hifi Setup: http://my.hifi.nl/?user=1651 Music Collection: http://www.hilbimuziekcollectie.tk

17th January 2010, 11:42 AM	#13900
Malefoda diyAudio Member Join Date: Jun 2006	Old Cerafine vs old Silmic, try one channel, maybe better bass? I won't fit any LM4562 until they have at least clean 317/337 or it may sount boring. Why not a good AD device? My 2cts. Left red Cerafine may be moved to DAC and Decoder. __________________ Old simple TT, cheap CDP with wise mods, Class T amp at its best: music!

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